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1 | 0f4a8a68 | Olga Brani | // Underscore.js 1.3.3
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2 | 0f4a8a68 | Olga Brani | // (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
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3 | 0f4a8a68 | Olga Brani | // Underscore is freely distributable under the MIT license.
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4 | 0f4a8a68 | Olga Brani | // Portions of Underscore are inspired or borrowed from Prototype,
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5 | 0f4a8a68 | Olga Brani | // Oliver Steele's Functional, and John Resig's Micro-Templating.
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6 | 0f4a8a68 | Olga Brani | // For all details and documentation:
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7 | 0f4a8a68 | Olga Brani | // http://documentcloud.github.com/underscore
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8 | 0f4a8a68 | Olga Brani | |
9 | 0f4a8a68 | Olga Brani | (function() {
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10 | 0f4a8a68 | Olga Brani | |
11 | 0f4a8a68 | Olga Brani | // Baseline setup
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12 | 0f4a8a68 | Olga Brani | // --------------
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13 | 0f4a8a68 | Olga Brani | |
14 | 0f4a8a68 | Olga Brani | // Establish the root object, `window` in the browser, or `global` on the server.
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15 | 0f4a8a68 | Olga Brani | var root = this; |
16 | 0f4a8a68 | Olga Brani | |
17 | 0f4a8a68 | Olga Brani | // Save the previous value of the `_` variable.
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18 | 0f4a8a68 | Olga Brani | var previousUnderscore = root._;
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19 | 0f4a8a68 | Olga Brani | |
20 | 0f4a8a68 | Olga Brani | // Establish the object that gets returned to break out of a loop iteration.
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21 | 0f4a8a68 | Olga Brani | var breaker = {};
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22 | 0f4a8a68 | Olga Brani | |
23 | 0f4a8a68 | Olga Brani | // Save bytes in the minified (but not gzipped) version:
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24 | 0f4a8a68 | Olga Brani | var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;
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25 | 0f4a8a68 | Olga Brani | |
26 | 0f4a8a68 | Olga Brani | // Create quick reference variables for speed access to core prototypes.
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27 | 0f4a8a68 | Olga Brani | var slice = ArrayProto.slice,
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28 | 0f4a8a68 | Olga Brani | unshift = ArrayProto.unshift, |
29 | 0f4a8a68 | Olga Brani | toString = ObjProto.toString, |
30 | 0f4a8a68 | Olga Brani | hasOwnProperty = ObjProto.hasOwnProperty; |
31 | 0f4a8a68 | Olga Brani | |
32 | 0f4a8a68 | Olga Brani | // All **ECMAScript 5** native function implementations that we hope to use
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33 | 0f4a8a68 | Olga Brani | // are declared here.
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34 | 0f4a8a68 | Olga Brani | var
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35 | 0f4a8a68 | Olga Brani | nativeForEach = ArrayProto.forEach, |
36 | 0f4a8a68 | Olga Brani | nativeMap = ArrayProto.map, |
37 | 0f4a8a68 | Olga Brani | nativeReduce = ArrayProto.reduce, |
38 | 0f4a8a68 | Olga Brani | nativeReduceRight = ArrayProto.reduceRight, |
39 | 0f4a8a68 | Olga Brani | nativeFilter = ArrayProto.filter, |
40 | 0f4a8a68 | Olga Brani | nativeEvery = ArrayProto.every, |
41 | 0f4a8a68 | Olga Brani | nativeSome = ArrayProto.some, |
42 | 0f4a8a68 | Olga Brani | nativeIndexOf = ArrayProto.indexOf, |
43 | 0f4a8a68 | Olga Brani | nativeLastIndexOf = ArrayProto.lastIndexOf, |
44 | 0f4a8a68 | Olga Brani | nativeIsArray = Array.isArray, |
45 | 0f4a8a68 | Olga Brani | nativeKeys = Object.keys, |
46 | 0f4a8a68 | Olga Brani | nativeBind = FuncProto.bind; |
47 | 0f4a8a68 | Olga Brani | |
48 | 0f4a8a68 | Olga Brani | // Create a safe reference to the Underscore object for use below.
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49 | 0f4a8a68 | Olga Brani | var _ = function(obj) { return new wrapper(obj); }; |
50 | 0f4a8a68 | Olga Brani | |
51 | 0f4a8a68 | Olga Brani | // Export the Underscore object for **Node.js**, with
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52 | 0f4a8a68 | Olga Brani | // backwards-compatibility for the old `require()` API. If we're in
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53 | 0f4a8a68 | Olga Brani | // the browser, add `_` as a global object via a string identifier,
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54 | 0f4a8a68 | Olga Brani | // for Closure Compiler "advanced" mode.
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55 | 0f4a8a68 | Olga Brani | if (typeof exports !== 'undefined') { |
56 | 0f4a8a68 | Olga Brani | if (typeof module !== 'undefined' && module.exports) { |
57 | 0f4a8a68 | Olga Brani | exports = module.exports = _; |
58 | 0f4a8a68 | Olga Brani | } |
59 | 0f4a8a68 | Olga Brani | exports._ = _; |
60 | 0f4a8a68 | Olga Brani | } else {
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61 | 0f4a8a68 | Olga Brani | root['_'] = _;
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62 | 0f4a8a68 | Olga Brani | } |
63 | 0f4a8a68 | Olga Brani | |
64 | 0f4a8a68 | Olga Brani | // Current version.
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65 | 0f4a8a68 | Olga Brani | _.VERSION = '1.3.3';
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66 | 0f4a8a68 | Olga Brani | |
67 | 0f4a8a68 | Olga Brani | // Collection Functions
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68 | 0f4a8a68 | Olga Brani | // --------------------
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69 | 0f4a8a68 | Olga Brani | |
70 | 0f4a8a68 | Olga Brani | // The cornerstone, an `each` implementation, aka `forEach`.
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71 | 0f4a8a68 | Olga Brani | // Handles objects with the built-in `forEach`, arrays, and raw objects.
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72 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `forEach` if available.
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73 | 0f4a8a68 | Olga Brani | var each = _.each = _.forEach = function(obj, iterator, context) { |
74 | 0f4a8a68 | Olga Brani | if (obj == null) return; |
75 | 0f4a8a68 | Olga Brani | if (nativeForEach && obj.forEach === nativeForEach) {
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76 | 0f4a8a68 | Olga Brani | obj.forEach(iterator, context); |
77 | 0f4a8a68 | Olga Brani | } else if (obj.length === +obj.length) { |
78 | 0f4a8a68 | Olga Brani | for (var i = 0, l = obj.length; i < l; i++) { |
79 | 0f4a8a68 | Olga Brani | if (i in obj && iterator.call(context, obj[i], i, obj) === breaker) return; |
80 | 0f4a8a68 | Olga Brani | } |
81 | 0f4a8a68 | Olga Brani | } else {
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82 | 0f4a8a68 | Olga Brani | for (var key in obj) { |
83 | 0f4a8a68 | Olga Brani | if (_.has(obj, key)) {
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84 | 0f4a8a68 | Olga Brani | if (iterator.call(context, obj[key], key, obj) === breaker) return; |
85 | 0f4a8a68 | Olga Brani | } |
86 | 0f4a8a68 | Olga Brani | } |
87 | 0f4a8a68 | Olga Brani | } |
88 | 0f4a8a68 | Olga Brani | }; |
89 | 0f4a8a68 | Olga Brani | |
90 | 0f4a8a68 | Olga Brani | // Return the results of applying the iterator to each element.
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91 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `map` if available.
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92 | 0f4a8a68 | Olga Brani | _.map = _.collect = function(obj, iterator, context) { |
93 | 0f4a8a68 | Olga Brani | var results = [];
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94 | 0f4a8a68 | Olga Brani | if (obj == null) return results; |
95 | 0f4a8a68 | Olga Brani | if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context); |
96 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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97 | 0f4a8a68 | Olga Brani | results[results.length] = iterator.call(context, value, index, list); |
98 | 0f4a8a68 | Olga Brani | }); |
99 | 0f4a8a68 | Olga Brani | if (obj.length === +obj.length) results.length = obj.length;
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100 | 0f4a8a68 | Olga Brani | return results;
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101 | 0f4a8a68 | Olga Brani | }; |
102 | 0f4a8a68 | Olga Brani | |
103 | 0f4a8a68 | Olga Brani | // **Reduce** builds up a single result from a list of values, aka `inject`,
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104 | 0f4a8a68 | Olga Brani | // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
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105 | 0f4a8a68 | Olga Brani | _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) { |
106 | 0f4a8a68 | Olga Brani | var initial = arguments.length > 2; |
107 | 0f4a8a68 | Olga Brani | if (obj == null) obj = []; |
108 | 0f4a8a68 | Olga Brani | if (nativeReduce && obj.reduce === nativeReduce) {
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109 | 0f4a8a68 | Olga Brani | if (context) iterator = _.bind(iterator, context);
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110 | 0f4a8a68 | Olga Brani | return initial ? obj.reduce(iterator, memo) : obj.reduce(iterator);
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111 | 0f4a8a68 | Olga Brani | } |
112 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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113 | 0f4a8a68 | Olga Brani | if (!initial) {
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114 | 0f4a8a68 | Olga Brani | memo = value; |
115 | 0f4a8a68 | Olga Brani | initial = true;
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116 | 0f4a8a68 | Olga Brani | } else {
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117 | 0f4a8a68 | Olga Brani | memo = iterator.call(context, memo, value, index, list); |
118 | 0f4a8a68 | Olga Brani | } |
119 | 0f4a8a68 | Olga Brani | }); |
120 | 0f4a8a68 | Olga Brani | if (!initial) throw new TypeError('Reduce of empty array with no initial value'); |
121 | 0f4a8a68 | Olga Brani | return memo;
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122 | 0f4a8a68 | Olga Brani | }; |
123 | 0f4a8a68 | Olga Brani | |
124 | 0f4a8a68 | Olga Brani | // The right-associative version of reduce, also known as `foldr`.
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125 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `reduceRight` if available.
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126 | 0f4a8a68 | Olga Brani | _.reduceRight = _.foldr = function(obj, iterator, memo, context) { |
127 | 0f4a8a68 | Olga Brani | var initial = arguments.length > 2; |
128 | 0f4a8a68 | Olga Brani | if (obj == null) obj = []; |
129 | 0f4a8a68 | Olga Brani | if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
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130 | 0f4a8a68 | Olga Brani | if (context) iterator = _.bind(iterator, context);
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131 | 0f4a8a68 | Olga Brani | return initial ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
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132 | 0f4a8a68 | Olga Brani | } |
133 | 0f4a8a68 | Olga Brani | var reversed = _.toArray(obj).reverse();
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134 | 0f4a8a68 | Olga Brani | if (context && !initial) iterator = _.bind(iterator, context);
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135 | 0f4a8a68 | Olga Brani | return initial ? _.reduce(reversed, iterator, memo, context) : _.reduce(reversed, iterator);
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136 | 0f4a8a68 | Olga Brani | }; |
137 | 0f4a8a68 | Olga Brani | |
138 | 0f4a8a68 | Olga Brani | // Return the first value which passes a truth test. Aliased as `detect`.
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139 | 0f4a8a68 | Olga Brani | _.find = _.detect = function(obj, iterator, context) { |
140 | 0f4a8a68 | Olga Brani | var result;
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141 | 0f4a8a68 | Olga Brani | any(obj, function(value, index, list) {
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142 | 0f4a8a68 | Olga Brani | if (iterator.call(context, value, index, list)) {
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143 | 0f4a8a68 | Olga Brani | result = value; |
144 | 0f4a8a68 | Olga Brani | return true; |
145 | 0f4a8a68 | Olga Brani | } |
146 | 0f4a8a68 | Olga Brani | }); |
147 | 0f4a8a68 | Olga Brani | return result;
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148 | 0f4a8a68 | Olga Brani | }; |
149 | 0f4a8a68 | Olga Brani | |
150 | 0f4a8a68 | Olga Brani | // Return all the elements that pass a truth test.
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151 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `filter` if available.
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152 | 0f4a8a68 | Olga Brani | // Aliased as `select`.
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153 | 0f4a8a68 | Olga Brani | _.filter = _.select = function(obj, iterator, context) { |
154 | 0f4a8a68 | Olga Brani | var results = [];
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155 | 0f4a8a68 | Olga Brani | if (obj == null) return results; |
156 | 0f4a8a68 | Olga Brani | if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context); |
157 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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158 | 0f4a8a68 | Olga Brani | if (iterator.call(context, value, index, list)) results[results.length] = value;
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159 | 0f4a8a68 | Olga Brani | }); |
160 | 0f4a8a68 | Olga Brani | return results;
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161 | 0f4a8a68 | Olga Brani | }; |
162 | 0f4a8a68 | Olga Brani | |
163 | 0f4a8a68 | Olga Brani | // Return all the elements for which a truth test fails.
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164 | 0f4a8a68 | Olga Brani | _.reject = function(obj, iterator, context) { |
165 | 0f4a8a68 | Olga Brani | var results = [];
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166 | 0f4a8a68 | Olga Brani | if (obj == null) return results; |
167 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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168 | 0f4a8a68 | Olga Brani | if (!iterator.call(context, value, index, list)) results[results.length] = value;
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169 | 0f4a8a68 | Olga Brani | }); |
170 | 0f4a8a68 | Olga Brani | return results;
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171 | 0f4a8a68 | Olga Brani | }; |
172 | 0f4a8a68 | Olga Brani | |
173 | 0f4a8a68 | Olga Brani | // Determine whether all of the elements match a truth test.
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174 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `every` if available.
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175 | 0f4a8a68 | Olga Brani | // Aliased as `all`.
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176 | 0f4a8a68 | Olga Brani | _.every = _.all = function(obj, iterator, context) { |
177 | 0f4a8a68 | Olga Brani | var result = true; |
178 | 0f4a8a68 | Olga Brani | if (obj == null) return result; |
179 | 0f4a8a68 | Olga Brani | if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context); |
180 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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181 | 0f4a8a68 | Olga Brani | if (!(result = result && iterator.call(context, value, index, list))) return breaker; |
182 | 0f4a8a68 | Olga Brani | }); |
183 | 0f4a8a68 | Olga Brani | return !!result;
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184 | 0f4a8a68 | Olga Brani | }; |
185 | 0f4a8a68 | Olga Brani | |
186 | 0f4a8a68 | Olga Brani | // Determine if at least one element in the object matches a truth test.
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187 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `some` if available.
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188 | 0f4a8a68 | Olga Brani | // Aliased as `any`.
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189 | 0f4a8a68 | Olga Brani | var any = _.some = _.any = function(obj, iterator, context) { |
190 | 0f4a8a68 | Olga Brani | iterator || (iterator = _.identity); |
191 | 0f4a8a68 | Olga Brani | var result = false; |
192 | 0f4a8a68 | Olga Brani | if (obj == null) return result; |
193 | 0f4a8a68 | Olga Brani | if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context); |
194 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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195 | 0f4a8a68 | Olga Brani | if (result || (result = iterator.call(context, value, index, list))) return breaker; |
196 | 0f4a8a68 | Olga Brani | }); |
197 | 0f4a8a68 | Olga Brani | return !!result;
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198 | 0f4a8a68 | Olga Brani | }; |
199 | 0f4a8a68 | Olga Brani | |
200 | 0f4a8a68 | Olga Brani | // Determine if a given value is included in the array or object using `===`.
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201 | 0f4a8a68 | Olga Brani | // Aliased as `contains`.
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202 | 0f4a8a68 | Olga Brani | _.include = _.contains = function(obj, target) { |
203 | 0f4a8a68 | Olga Brani | var found = false; |
204 | 0f4a8a68 | Olga Brani | if (obj == null) return found; |
205 | 0f4a8a68 | Olga Brani | if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1; |
206 | 0f4a8a68 | Olga Brani | found = any(obj, function(value) {
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207 | 0f4a8a68 | Olga Brani | return value === target;
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208 | 0f4a8a68 | Olga Brani | }); |
209 | 0f4a8a68 | Olga Brani | return found;
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210 | 0f4a8a68 | Olga Brani | }; |
211 | 0f4a8a68 | Olga Brani | |
212 | 0f4a8a68 | Olga Brani | // Invoke a method (with arguments) on every item in a collection.
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213 | 0f4a8a68 | Olga Brani | _.invoke = function(obj, method) { |
214 | 0f4a8a68 | Olga Brani | var args = slice.call(arguments, 2); |
215 | 0f4a8a68 | Olga Brani | return _.map(obj, function(value) { |
216 | 0f4a8a68 | Olga Brani | return (_.isFunction(method) ? method || value : value[method]).apply(value, args);
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217 | 0f4a8a68 | Olga Brani | }); |
218 | 0f4a8a68 | Olga Brani | }; |
219 | 0f4a8a68 | Olga Brani | |
220 | 0f4a8a68 | Olga Brani | // Convenience version of a common use case of `map`: fetching a property.
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221 | 0f4a8a68 | Olga Brani | _.pluck = function(obj, key) { |
222 | 0f4a8a68 | Olga Brani | return _.map(obj, function(value){ return value[key]; }); |
223 | 0f4a8a68 | Olga Brani | }; |
224 | 0f4a8a68 | Olga Brani | |
225 | 0f4a8a68 | Olga Brani | // Return the maximum element or (element-based computation).
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226 | 0f4a8a68 | Olga Brani | _.max = function(obj, iterator, context) { |
227 | 0f4a8a68 | Olga Brani | if (!iterator && _.isArray(obj) && obj[0] === +obj[0]) return Math.max.apply(Math, obj); |
228 | 0f4a8a68 | Olga Brani | if (!iterator && _.isEmpty(obj)) return -Infinity; |
229 | 0f4a8a68 | Olga Brani | var result = {computed : -Infinity}; |
230 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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231 | 0f4a8a68 | Olga Brani | var computed = iterator ? iterator.call(context, value, index, list) : value;
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232 | 0f4a8a68 | Olga Brani | computed >= result.computed && (result = {value : value, computed : computed}); |
233 | 0f4a8a68 | Olga Brani | }); |
234 | 0f4a8a68 | Olga Brani | return result.value;
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235 | 0f4a8a68 | Olga Brani | }; |
236 | 0f4a8a68 | Olga Brani | |
237 | 0f4a8a68 | Olga Brani | // Return the minimum element (or element-based computation).
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238 | 0f4a8a68 | Olga Brani | _.min = function(obj, iterator, context) { |
239 | 0f4a8a68 | Olga Brani | if (!iterator && _.isArray(obj) && obj[0] === +obj[0]) return Math.min.apply(Math, obj); |
240 | 0f4a8a68 | Olga Brani | if (!iterator && _.isEmpty(obj)) return Infinity; |
241 | 0f4a8a68 | Olga Brani | var result = {computed : Infinity}; |
242 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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243 | 0f4a8a68 | Olga Brani | var computed = iterator ? iterator.call(context, value, index, list) : value;
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244 | 0f4a8a68 | Olga Brani | computed < result.computed && (result = {value : value, computed : computed}); |
245 | 0f4a8a68 | Olga Brani | }); |
246 | 0f4a8a68 | Olga Brani | return result.value;
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247 | 0f4a8a68 | Olga Brani | }; |
248 | 0f4a8a68 | Olga Brani | |
249 | 0f4a8a68 | Olga Brani | // Shuffle an array.
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250 | 0f4a8a68 | Olga Brani | _.shuffle = function(obj) { |
251 | 0f4a8a68 | Olga Brani | var shuffled = [], rand;
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252 | 0f4a8a68 | Olga Brani | each(obj, function(value, index, list) {
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253 | 0f4a8a68 | Olga Brani | rand = Math.floor(Math.random() * (index + 1));
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254 | 0f4a8a68 | Olga Brani | shuffled[index] = shuffled[rand]; |
255 | 0f4a8a68 | Olga Brani | shuffled[rand] = value; |
256 | 0f4a8a68 | Olga Brani | }); |
257 | 0f4a8a68 | Olga Brani | return shuffled;
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258 | 0f4a8a68 | Olga Brani | }; |
259 | 0f4a8a68 | Olga Brani | |
260 | 0f4a8a68 | Olga Brani | // Sort the object's values by a criterion produced by an iterator.
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261 | 0f4a8a68 | Olga Brani | _.sortBy = function(obj, val, context) { |
262 | 0f4a8a68 | Olga Brani | var iterator = _.isFunction(val) ? val : function(obj) { return obj[val]; }; |
263 | 0f4a8a68 | Olga Brani | return _.pluck(_.map(obj, function(value, index, list) { |
264 | 0f4a8a68 | Olga Brani | return {
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265 | 0f4a8a68 | Olga Brani | value : value,
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266 | 0f4a8a68 | Olga Brani | criteria : iterator.call(context, value, index, list)
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267 | 0f4a8a68 | Olga Brani | }; |
268 | 0f4a8a68 | Olga Brani | }).sort(function(left, right) {
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269 | 0f4a8a68 | Olga Brani | var a = left.criteria, b = right.criteria;
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270 | 0f4a8a68 | Olga Brani | if (a === void 0) return 1; |
271 | 0f4a8a68 | Olga Brani | if (b === void 0) return -1; |
272 | 0f4a8a68 | Olga Brani | return a < b ? -1 : a > b ? 1 : 0; |
273 | 0f4a8a68 | Olga Brani | }), 'value');
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274 | 0f4a8a68 | Olga Brani | }; |
275 | 0f4a8a68 | Olga Brani | |
276 | 0f4a8a68 | Olga Brani | // Groups the object's values by a criterion. Pass either a string attribute
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277 | 0f4a8a68 | Olga Brani | // to group by, or a function that returns the criterion.
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278 | 0f4a8a68 | Olga Brani | _.groupBy = function(obj, val) { |
279 | 0f4a8a68 | Olga Brani | var result = {};
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280 | 0f4a8a68 | Olga Brani | var iterator = _.isFunction(val) ? val : function(obj) { return obj[val]; }; |
281 | 0f4a8a68 | Olga Brani | each(obj, function(value, index) {
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282 | 0f4a8a68 | Olga Brani | var key = iterator(value, index);
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283 | 0f4a8a68 | Olga Brani | (result[key] || (result[key] = [])).push(value); |
284 | 0f4a8a68 | Olga Brani | }); |
285 | 0f4a8a68 | Olga Brani | return result;
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286 | 0f4a8a68 | Olga Brani | }; |
287 | 0f4a8a68 | Olga Brani | |
288 | 0f4a8a68 | Olga Brani | // Use a comparator function to figure out at what index an object should
|
289 | 0f4a8a68 | Olga Brani | // be inserted so as to maintain order. Uses binary search.
|
290 | 0f4a8a68 | Olga Brani | _.sortedIndex = function(array, obj, iterator) { |
291 | 0f4a8a68 | Olga Brani | iterator || (iterator = _.identity); |
292 | 0f4a8a68 | Olga Brani | var low = 0, high = array.length; |
293 | 0f4a8a68 | Olga Brani | while (low < high) {
|
294 | 0f4a8a68 | Olga Brani | var mid = (low + high) >> 1; |
295 | 0f4a8a68 | Olga Brani | iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid;
|
296 | 0f4a8a68 | Olga Brani | } |
297 | 0f4a8a68 | Olga Brani | return low;
|
298 | 0f4a8a68 | Olga Brani | }; |
299 | 0f4a8a68 | Olga Brani | |
300 | 0f4a8a68 | Olga Brani | // Safely convert anything iterable into a real, live array.
|
301 | 0f4a8a68 | Olga Brani | _.toArray = function(obj) { |
302 | 0f4a8a68 | Olga Brani | if (!obj) return []; |
303 | 0f4a8a68 | Olga Brani | if (_.isArray(obj)) return slice.call(obj); |
304 | 0f4a8a68 | Olga Brani | if (_.isArguments(obj)) return slice.call(obj); |
305 | 0f4a8a68 | Olga Brani | if (obj.toArray && _.isFunction(obj.toArray)) return obj.toArray(); |
306 | 0f4a8a68 | Olga Brani | return _.values(obj);
|
307 | 0f4a8a68 | Olga Brani | }; |
308 | 0f4a8a68 | Olga Brani | |
309 | 0f4a8a68 | Olga Brani | // Return the number of elements in an object.
|
310 | 0f4a8a68 | Olga Brani | _.size = function(obj) { |
311 | 0f4a8a68 | Olga Brani | return _.isArray(obj) ? obj.length : _.keys(obj).length;
|
312 | 0f4a8a68 | Olga Brani | }; |
313 | 0f4a8a68 | Olga Brani | |
314 | 0f4a8a68 | Olga Brani | // Array Functions
|
315 | 0f4a8a68 | Olga Brani | // ---------------
|
316 | 0f4a8a68 | Olga Brani | |
317 | 0f4a8a68 | Olga Brani | // Get the first element of an array. Passing **n** will return the first N
|
318 | 0f4a8a68 | Olga Brani | // values in the array. Aliased as `head` and `take`. The **guard** check
|
319 | 0f4a8a68 | Olga Brani | // allows it to work with `_.map`.
|
320 | 0f4a8a68 | Olga Brani | _.first = _.head = _.take = function(array, n, guard) { |
321 | 0f4a8a68 | Olga Brani | return (n != null) && !guard ? slice.call(array, 0, n) : array[0]; |
322 | 0f4a8a68 | Olga Brani | }; |
323 | 0f4a8a68 | Olga Brani | |
324 | 0f4a8a68 | Olga Brani | // Returns everything but the last entry of the array. Especcialy useful on
|
325 | 0f4a8a68 | Olga Brani | // the arguments object. Passing **n** will return all the values in
|
326 | 0f4a8a68 | Olga Brani | // the array, excluding the last N. The **guard** check allows it to work with
|
327 | 0f4a8a68 | Olga Brani | // `_.map`.
|
328 | 0f4a8a68 | Olga Brani | _.initial = function(array, n, guard) { |
329 | 0f4a8a68 | Olga Brani | return slice.call(array, 0, array.length - ((n == null) || guard ? 1 : n)); |
330 | 0f4a8a68 | Olga Brani | }; |
331 | 0f4a8a68 | Olga Brani | |
332 | 0f4a8a68 | Olga Brani | // Get the last element of an array. Passing **n** will return the last N
|
333 | 0f4a8a68 | Olga Brani | // values in the array. The **guard** check allows it to work with `_.map`.
|
334 | 0f4a8a68 | Olga Brani | _.last = function(array, n, guard) { |
335 | 0f4a8a68 | Olga Brani | if ((n != null) && !guard) { |
336 | 0f4a8a68 | Olga Brani | return slice.call(array, Math.max(array.length - n, 0)); |
337 | 0f4a8a68 | Olga Brani | } else {
|
338 | 0f4a8a68 | Olga Brani | return array[array.length - 1]; |
339 | 0f4a8a68 | Olga Brani | } |
340 | 0f4a8a68 | Olga Brani | }; |
341 | 0f4a8a68 | Olga Brani | |
342 | 0f4a8a68 | Olga Brani | // Returns everything but the first entry of the array. Aliased as `tail`.
|
343 | 0f4a8a68 | Olga Brani | // Especially useful on the arguments object. Passing an **index** will return
|
344 | 0f4a8a68 | Olga Brani | // the rest of the values in the array from that index onward. The **guard**
|
345 | 0f4a8a68 | Olga Brani | // check allows it to work with `_.map`.
|
346 | 0f4a8a68 | Olga Brani | _.rest = _.tail = function(array, index, guard) { |
347 | 0f4a8a68 | Olga Brani | return slice.call(array, (index == null) || guard ? 1 : index); |
348 | 0f4a8a68 | Olga Brani | }; |
349 | 0f4a8a68 | Olga Brani | |
350 | 0f4a8a68 | Olga Brani | // Trim out all falsy values from an array.
|
351 | 0f4a8a68 | Olga Brani | _.compact = function(array) { |
352 | 0f4a8a68 | Olga Brani | return _.filter(array, function(value){ return !!value; }); |
353 | 0f4a8a68 | Olga Brani | }; |
354 | 0f4a8a68 | Olga Brani | |
355 | 0f4a8a68 | Olga Brani | // Return a completely flattened version of an array.
|
356 | 0f4a8a68 | Olga Brani | _.flatten = function(array, shallow) { |
357 | 0f4a8a68 | Olga Brani | return _.reduce(array, function(memo, value) { |
358 | 0f4a8a68 | Olga Brani | if (_.isArray(value)) return memo.concat(shallow ? value : _.flatten(value)); |
359 | 0f4a8a68 | Olga Brani | memo[memo.length] = value; |
360 | 0f4a8a68 | Olga Brani | return memo;
|
361 | 0f4a8a68 | Olga Brani | }, []); |
362 | 0f4a8a68 | Olga Brani | }; |
363 | 0f4a8a68 | Olga Brani | |
364 | 0f4a8a68 | Olga Brani | // Return a version of the array that does not contain the specified value(s).
|
365 | 0f4a8a68 | Olga Brani | _.without = function(array) { |
366 | 0f4a8a68 | Olga Brani | return _.difference(array, slice.call(arguments, 1)); |
367 | 0f4a8a68 | Olga Brani | }; |
368 | 0f4a8a68 | Olga Brani | |
369 | 0f4a8a68 | Olga Brani | // Produce a duplicate-free version of the array. If the array has already
|
370 | 0f4a8a68 | Olga Brani | // been sorted, you have the option of using a faster algorithm.
|
371 | 0f4a8a68 | Olga Brani | // Aliased as `unique`.
|
372 | 0f4a8a68 | Olga Brani | _.uniq = _.unique = function(array, isSorted, iterator) { |
373 | 0f4a8a68 | Olga Brani | var initial = iterator ? _.map(array, iterator) : array;
|
374 | 0f4a8a68 | Olga Brani | var results = [];
|
375 | 0f4a8a68 | Olga Brani | // The `isSorted` flag is irrelevant if the array only contains two elements.
|
376 | 0f4a8a68 | Olga Brani | if (array.length < 3) isSorted = true; |
377 | 0f4a8a68 | Olga Brani | _.reduce(initial, function (memo, value, index) {
|
378 | 0f4a8a68 | Olga Brani | if (isSorted ? _.last(memo) !== value || !memo.length : !_.include(memo, value)) {
|
379 | 0f4a8a68 | Olga Brani | memo.push(value); |
380 | 0f4a8a68 | Olga Brani | results.push(array[index]); |
381 | 0f4a8a68 | Olga Brani | } |
382 | 0f4a8a68 | Olga Brani | return memo;
|
383 | 0f4a8a68 | Olga Brani | }, []); |
384 | 0f4a8a68 | Olga Brani | return results;
|
385 | 0f4a8a68 | Olga Brani | }; |
386 | 0f4a8a68 | Olga Brani | |
387 | 0f4a8a68 | Olga Brani | // Produce an array that contains the union: each distinct element from all of
|
388 | 0f4a8a68 | Olga Brani | // the passed-in arrays.
|
389 | 0f4a8a68 | Olga Brani | _.union = function() { |
390 | 0f4a8a68 | Olga Brani | return _.uniq(_.flatten(arguments, true)); |
391 | 0f4a8a68 | Olga Brani | }; |
392 | 0f4a8a68 | Olga Brani | |
393 | 0f4a8a68 | Olga Brani | // Produce an array that contains every item shared between all the
|
394 | 0f4a8a68 | Olga Brani | // passed-in arrays. (Aliased as "intersect" for back-compat.)
|
395 | 0f4a8a68 | Olga Brani | _.intersection = _.intersect = function(array) { |
396 | 0f4a8a68 | Olga Brani | var rest = slice.call(arguments, 1); |
397 | 0f4a8a68 | Olga Brani | return _.filter(_.uniq(array), function(item) { |
398 | 0f4a8a68 | Olga Brani | return _.every(rest, function(other) { |
399 | 0f4a8a68 | Olga Brani | return _.indexOf(other, item) >= 0; |
400 | 0f4a8a68 | Olga Brani | }); |
401 | 0f4a8a68 | Olga Brani | }); |
402 | 0f4a8a68 | Olga Brani | }; |
403 | 0f4a8a68 | Olga Brani | |
404 | 0f4a8a68 | Olga Brani | // Take the difference between one array and a number of other arrays.
|
405 | 0f4a8a68 | Olga Brani | // Only the elements present in just the first array will remain.
|
406 | 0f4a8a68 | Olga Brani | _.difference = function(array) { |
407 | 0f4a8a68 | Olga Brani | var rest = _.flatten(slice.call(arguments, 1), true); |
408 | 0f4a8a68 | Olga Brani | return _.filter(array, function(value){ return !_.include(rest, value); }); |
409 | 0f4a8a68 | Olga Brani | }; |
410 | 0f4a8a68 | Olga Brani | |
411 | 0f4a8a68 | Olga Brani | // Zip together multiple lists into a single array -- elements that share
|
412 | 0f4a8a68 | Olga Brani | // an index go together.
|
413 | 0f4a8a68 | Olga Brani | _.zip = function() { |
414 | 0f4a8a68 | Olga Brani | var args = slice.call(arguments); |
415 | 0f4a8a68 | Olga Brani | var length = _.max(_.pluck(args, 'length')); |
416 | 0f4a8a68 | Olga Brani | var results = new Array(length); |
417 | 0f4a8a68 | Olga Brani | for (var i = 0; i < length; i++) results[i] = _.pluck(args, "" + i); |
418 | 0f4a8a68 | Olga Brani | return results;
|
419 | 0f4a8a68 | Olga Brani | }; |
420 | 0f4a8a68 | Olga Brani | |
421 | 0f4a8a68 | Olga Brani | // If the browser doesn't supply us with indexOf (I'm looking at you, **MSIE**),
|
422 | 0f4a8a68 | Olga Brani | // we need this function. Return the position of the first occurrence of an
|
423 | 0f4a8a68 | Olga Brani | // item in an array, or -1 if the item is not included in the array.
|
424 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `indexOf` if available.
|
425 | 0f4a8a68 | Olga Brani | // If the array is large and already in sort order, pass `true`
|
426 | 0f4a8a68 | Olga Brani | // for **isSorted** to use binary search.
|
427 | 0f4a8a68 | Olga Brani | _.indexOf = function(array, item, isSorted) { |
428 | 0f4a8a68 | Olga Brani | if (array == null) return -1; |
429 | 0f4a8a68 | Olga Brani | var i, l;
|
430 | 0f4a8a68 | Olga Brani | if (isSorted) {
|
431 | 0f4a8a68 | Olga Brani | i = _.sortedIndex(array, item); |
432 | 0f4a8a68 | Olga Brani | return array[i] === item ? i : -1; |
433 | 0f4a8a68 | Olga Brani | } |
434 | 0f4a8a68 | Olga Brani | if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item); |
435 | 0f4a8a68 | Olga Brani | for (i = 0, l = array.length; i < l; i++) if (i in array && array[i] === item) return i; |
436 | 0f4a8a68 | Olga Brani | return -1; |
437 | 0f4a8a68 | Olga Brani | }; |
438 | 0f4a8a68 | Olga Brani | |
439 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
|
440 | 0f4a8a68 | Olga Brani | _.lastIndexOf = function(array, item) { |
441 | 0f4a8a68 | Olga Brani | if (array == null) return -1; |
442 | 0f4a8a68 | Olga Brani | if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item); |
443 | 0f4a8a68 | Olga Brani | var i = array.length;
|
444 | 0f4a8a68 | Olga Brani | while (i--) if (i in array && array[i] === item) return i; |
445 | 0f4a8a68 | Olga Brani | return -1; |
446 | 0f4a8a68 | Olga Brani | }; |
447 | 0f4a8a68 | Olga Brani | |
448 | 0f4a8a68 | Olga Brani | // Generate an integer Array containing an arithmetic progression. A port of
|
449 | 0f4a8a68 | Olga Brani | // the native Python `range()` function. See
|
450 | 0f4a8a68 | Olga Brani | // [the Python documentation](http://docs.python.org/library/functions.html#range).
|
451 | 0f4a8a68 | Olga Brani | _.range = function(start, stop, step) { |
452 | 0f4a8a68 | Olga Brani | if (arguments.length <= 1) { |
453 | 0f4a8a68 | Olga Brani | stop = start || 0;
|
454 | 0f4a8a68 | Olga Brani | start = 0;
|
455 | 0f4a8a68 | Olga Brani | } |
456 | 0f4a8a68 | Olga Brani | step = arguments[2] || 1; |
457 | 0f4a8a68 | Olga Brani | |
458 | 0f4a8a68 | Olga Brani | var len = Math.max(Math.ceil((stop - start) / step), 0); |
459 | 0f4a8a68 | Olga Brani | var idx = 0; |
460 | 0f4a8a68 | Olga Brani | var range = new Array(len); |
461 | 0f4a8a68 | Olga Brani | |
462 | 0f4a8a68 | Olga Brani | while(idx < len) {
|
463 | 0f4a8a68 | Olga Brani | range[idx++] = start; |
464 | 0f4a8a68 | Olga Brani | start += step; |
465 | 0f4a8a68 | Olga Brani | } |
466 | 0f4a8a68 | Olga Brani | |
467 | 0f4a8a68 | Olga Brani | return range;
|
468 | 0f4a8a68 | Olga Brani | }; |
469 | 0f4a8a68 | Olga Brani | |
470 | 0f4a8a68 | Olga Brani | // Function (ahem) Functions
|
471 | 0f4a8a68 | Olga Brani | // ------------------
|
472 | 0f4a8a68 | Olga Brani | |
473 | 0f4a8a68 | Olga Brani | // Reusable constructor function for prototype setting.
|
474 | 0f4a8a68 | Olga Brani | var ctor = function(){}; |
475 | 0f4a8a68 | Olga Brani | |
476 | 0f4a8a68 | Olga Brani | // Create a function bound to a given object (assigning `this`, and arguments,
|
477 | 0f4a8a68 | Olga Brani | // optionally). Binding with arguments is also known as `curry`.
|
478 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `Function.bind` if available.
|
479 | 0f4a8a68 | Olga Brani | // We check for `func.bind` first, to fail fast when `func` is undefined.
|
480 | 0f4a8a68 | Olga Brani | _.bind = function bind(func, context) { |
481 | 0f4a8a68 | Olga Brani | var bound, args;
|
482 | 0f4a8a68 | Olga Brani | if (func.bind === nativeBind && nativeBind) return nativeBind.apply(func, slice.call(arguments, 1)); |
483 | 0f4a8a68 | Olga Brani | if (!_.isFunction(func)) throw new TypeError; |
484 | 0f4a8a68 | Olga Brani | args = slice.call(arguments, 2); |
485 | 0f4a8a68 | Olga Brani | return bound = function() { |
486 | 0f4a8a68 | Olga Brani | if (!(this instanceof bound)) return func.apply(context, args.concat(slice.call(arguments))); |
487 | 0f4a8a68 | Olga Brani | ctor.prototype = func.prototype; |
488 | 0f4a8a68 | Olga Brani | var self = new ctor; |
489 | 0f4a8a68 | Olga Brani | var result = func.apply(self, args.concat(slice.call(arguments))); |
490 | 0f4a8a68 | Olga Brani | if (Object(result) === result) return result; |
491 | 0f4a8a68 | Olga Brani | return self;
|
492 | 0f4a8a68 | Olga Brani | }; |
493 | 0f4a8a68 | Olga Brani | }; |
494 | 0f4a8a68 | Olga Brani | |
495 | 0f4a8a68 | Olga Brani | // Bind all of an object's methods to that object. Useful for ensuring that
|
496 | 0f4a8a68 | Olga Brani | // all callbacks defined on an object belong to it.
|
497 | 0f4a8a68 | Olga Brani | _.bindAll = function(obj) { |
498 | 0f4a8a68 | Olga Brani | var funcs = slice.call(arguments, 1); |
499 | 0f4a8a68 | Olga Brani | if (funcs.length == 0) funcs = _.functions(obj); |
500 | 0f4a8a68 | Olga Brani | each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
|
501 | 0f4a8a68 | Olga Brani | return obj;
|
502 | 0f4a8a68 | Olga Brani | }; |
503 | 0f4a8a68 | Olga Brani | |
504 | 0f4a8a68 | Olga Brani | // Memoize an expensive function by storing its results.
|
505 | 0f4a8a68 | Olga Brani | _.memoize = function(func, hasher) { |
506 | 0f4a8a68 | Olga Brani | var memo = {};
|
507 | 0f4a8a68 | Olga Brani | hasher || (hasher = _.identity); |
508 | 0f4a8a68 | Olga Brani | return function() { |
509 | 0f4a8a68 | Olga Brani | var key = hasher.apply(this, arguments); |
510 | 0f4a8a68 | Olga Brani | return _.has(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments)); |
511 | 0f4a8a68 | Olga Brani | }; |
512 | 0f4a8a68 | Olga Brani | }; |
513 | 0f4a8a68 | Olga Brani | |
514 | 0f4a8a68 | Olga Brani | // Delays a function for the given number of milliseconds, and then calls
|
515 | 0f4a8a68 | Olga Brani | // it with the arguments supplied.
|
516 | 0f4a8a68 | Olga Brani | _.delay = function(func, wait) { |
517 | 0f4a8a68 | Olga Brani | var args = slice.call(arguments, 2); |
518 | 0f4a8a68 | Olga Brani | return setTimeout(function(){ return func.apply(null, args); }, wait); |
519 | 0f4a8a68 | Olga Brani | }; |
520 | 0f4a8a68 | Olga Brani | |
521 | 0f4a8a68 | Olga Brani | // Defers a function, scheduling it to run after the current call stack has
|
522 | 0f4a8a68 | Olga Brani | // cleared.
|
523 | 0f4a8a68 | Olga Brani | _.defer = function(func) { |
524 | 0f4a8a68 | Olga Brani | return _.delay.apply(_, [func, 1].concat(slice.call(arguments, 1))); |
525 | 0f4a8a68 | Olga Brani | }; |
526 | 0f4a8a68 | Olga Brani | |
527 | 0f4a8a68 | Olga Brani | // Returns a function, that, when invoked, will only be triggered at most once
|
528 | 0f4a8a68 | Olga Brani | // during a given window of time.
|
529 | 0f4a8a68 | Olga Brani | _.throttle = function(func, wait) { |
530 | 0f4a8a68 | Olga Brani | var context, args, timeout, throttling, more, result;
|
531 | 0f4a8a68 | Olga Brani | var whenDone = _.debounce(function(){ more = throttling = false; }, wait); |
532 | 0f4a8a68 | Olga Brani | return function() { |
533 | 0f4a8a68 | Olga Brani | context = this; args = arguments; |
534 | 0f4a8a68 | Olga Brani | var later = function() { |
535 | 0f4a8a68 | Olga Brani | timeout = null;
|
536 | 0f4a8a68 | Olga Brani | if (more) func.apply(context, args);
|
537 | 0f4a8a68 | Olga Brani | whenDone(); |
538 | 0f4a8a68 | Olga Brani | }; |
539 | 0f4a8a68 | Olga Brani | if (!timeout) timeout = setTimeout(later, wait);
|
540 | 0f4a8a68 | Olga Brani | if (throttling) {
|
541 | 0f4a8a68 | Olga Brani | more = true;
|
542 | 0f4a8a68 | Olga Brani | } else {
|
543 | 0f4a8a68 | Olga Brani | result = func.apply(context, args); |
544 | 0f4a8a68 | Olga Brani | } |
545 | 0f4a8a68 | Olga Brani | whenDone(); |
546 | 0f4a8a68 | Olga Brani | throttling = true;
|
547 | 0f4a8a68 | Olga Brani | return result;
|
548 | 0f4a8a68 | Olga Brani | }; |
549 | 0f4a8a68 | Olga Brani | }; |
550 | 0f4a8a68 | Olga Brani | |
551 | 0f4a8a68 | Olga Brani | // Returns a function, that, as long as it continues to be invoked, will not
|
552 | 0f4a8a68 | Olga Brani | // be triggered. The function will be called after it stops being called for
|
553 | 0f4a8a68 | Olga Brani | // N milliseconds. If `immediate` is passed, trigger the function on the
|
554 | 0f4a8a68 | Olga Brani | // leading edge, instead of the trailing.
|
555 | 0f4a8a68 | Olga Brani | _.debounce = function(func, wait, immediate) { |
556 | 0f4a8a68 | Olga Brani | var timeout;
|
557 | 0f4a8a68 | Olga Brani | return function() { |
558 | 0f4a8a68 | Olga Brani | var context = this, args = arguments; |
559 | 0f4a8a68 | Olga Brani | var later = function() { |
560 | 0f4a8a68 | Olga Brani | timeout = null;
|
561 | 0f4a8a68 | Olga Brani | if (!immediate) func.apply(context, args);
|
562 | 0f4a8a68 | Olga Brani | }; |
563 | 0f4a8a68 | Olga Brani | if (immediate && !timeout) func.apply(context, args);
|
564 | 0f4a8a68 | Olga Brani | clearTimeout(timeout); |
565 | 0f4a8a68 | Olga Brani | timeout = setTimeout(later, wait); |
566 | 0f4a8a68 | Olga Brani | }; |
567 | 0f4a8a68 | Olga Brani | }; |
568 | 0f4a8a68 | Olga Brani | |
569 | 0f4a8a68 | Olga Brani | // Returns a function that will be executed at most one time, no matter how
|
570 | 0f4a8a68 | Olga Brani | // often you call it. Useful for lazy initialization.
|
571 | 0f4a8a68 | Olga Brani | _.once = function(func) { |
572 | 0f4a8a68 | Olga Brani | var ran = false, memo; |
573 | 0f4a8a68 | Olga Brani | return function() { |
574 | 0f4a8a68 | Olga Brani | if (ran) return memo; |
575 | 0f4a8a68 | Olga Brani | ran = true;
|
576 | 0f4a8a68 | Olga Brani | return memo = func.apply(this, arguments); |
577 | 0f4a8a68 | Olga Brani | }; |
578 | 0f4a8a68 | Olga Brani | }; |
579 | 0f4a8a68 | Olga Brani | |
580 | 0f4a8a68 | Olga Brani | // Returns the first function passed as an argument to the second,
|
581 | 0f4a8a68 | Olga Brani | // allowing you to adjust arguments, run code before and after, and
|
582 | 0f4a8a68 | Olga Brani | // conditionally execute the original function.
|
583 | 0f4a8a68 | Olga Brani | _.wrap = function(func, wrapper) { |
584 | 0f4a8a68 | Olga Brani | return function() { |
585 | 0f4a8a68 | Olga Brani | var args = [func].concat(slice.call(arguments, 0)); |
586 | 0f4a8a68 | Olga Brani | return wrapper.apply(this, args); |
587 | 0f4a8a68 | Olga Brani | }; |
588 | 0f4a8a68 | Olga Brani | }; |
589 | 0f4a8a68 | Olga Brani | |
590 | 0f4a8a68 | Olga Brani | // Returns a function that is the composition of a list of functions, each
|
591 | 0f4a8a68 | Olga Brani | // consuming the return value of the function that follows.
|
592 | 0f4a8a68 | Olga Brani | _.compose = function() { |
593 | 0f4a8a68 | Olga Brani | var funcs = arguments; |
594 | 0f4a8a68 | Olga Brani | return function() { |
595 | 0f4a8a68 | Olga Brani | var args = arguments; |
596 | 0f4a8a68 | Olga Brani | for (var i = funcs.length - 1; i >= 0; i--) { |
597 | 0f4a8a68 | Olga Brani | args = [funcs[i].apply(this, args)];
|
598 | 0f4a8a68 | Olga Brani | } |
599 | 0f4a8a68 | Olga Brani | return args[0]; |
600 | 0f4a8a68 | Olga Brani | }; |
601 | 0f4a8a68 | Olga Brani | }; |
602 | 0f4a8a68 | Olga Brani | |
603 | 0f4a8a68 | Olga Brani | // Returns a function that will only be executed after being called N times.
|
604 | 0f4a8a68 | Olga Brani | _.after = function(times, func) { |
605 | 0f4a8a68 | Olga Brani | if (times <= 0) return func(); |
606 | 0f4a8a68 | Olga Brani | return function() { |
607 | 0f4a8a68 | Olga Brani | if (--times < 1) { return func.apply(this, arguments); } |
608 | 0f4a8a68 | Olga Brani | }; |
609 | 0f4a8a68 | Olga Brani | }; |
610 | 0f4a8a68 | Olga Brani | |
611 | 0f4a8a68 | Olga Brani | // Object Functions
|
612 | 0f4a8a68 | Olga Brani | // ----------------
|
613 | 0f4a8a68 | Olga Brani | |
614 | 0f4a8a68 | Olga Brani | // Retrieve the names of an object's properties.
|
615 | 0f4a8a68 | Olga Brani | // Delegates to **ECMAScript 5**'s native `Object.keys`
|
616 | 0f4a8a68 | Olga Brani | _.keys = nativeKeys || function(obj) {
|
617 | 0f4a8a68 | Olga Brani | if (obj !== Object(obj)) throw new TypeError('Invalid object'); |
618 | 0f4a8a68 | Olga Brani | var keys = [];
|
619 | 0f4a8a68 | Olga Brani | for (var key in obj) if (_.has(obj, key)) keys[keys.length] = key; |
620 | 0f4a8a68 | Olga Brani | return keys;
|
621 | 0f4a8a68 | Olga Brani | }; |
622 | 0f4a8a68 | Olga Brani | |
623 | 0f4a8a68 | Olga Brani | // Retrieve the values of an object's properties.
|
624 | 0f4a8a68 | Olga Brani | _.values = function(obj) { |
625 | 0f4a8a68 | Olga Brani | return _.map(obj, _.identity);
|
626 | 0f4a8a68 | Olga Brani | }; |
627 | 0f4a8a68 | Olga Brani | |
628 | 0f4a8a68 | Olga Brani | // Return a sorted list of the function names available on the object.
|
629 | 0f4a8a68 | Olga Brani | // Aliased as `methods`
|
630 | 0f4a8a68 | Olga Brani | _.functions = _.methods = function(obj) { |
631 | 0f4a8a68 | Olga Brani | var names = [];
|
632 | 0f4a8a68 | Olga Brani | for (var key in obj) { |
633 | 0f4a8a68 | Olga Brani | if (_.isFunction(obj[key])) names.push(key);
|
634 | 0f4a8a68 | Olga Brani | } |
635 | 0f4a8a68 | Olga Brani | return names.sort();
|
636 | 0f4a8a68 | Olga Brani | }; |
637 | 0f4a8a68 | Olga Brani | |
638 | 0f4a8a68 | Olga Brani | // Extend a given object with all the properties in passed-in object(s).
|
639 | 0f4a8a68 | Olga Brani | _.extend = function(obj) { |
640 | 0f4a8a68 | Olga Brani | each(slice.call(arguments, 1), function(source) { |
641 | 0f4a8a68 | Olga Brani | for (var prop in source) { |
642 | 0f4a8a68 | Olga Brani | obj[prop] = source[prop]; |
643 | 0f4a8a68 | Olga Brani | } |
644 | 0f4a8a68 | Olga Brani | }); |
645 | 0f4a8a68 | Olga Brani | return obj;
|
646 | 0f4a8a68 | Olga Brani | }; |
647 | 0f4a8a68 | Olga Brani | |
648 | 0f4a8a68 | Olga Brani | // Return a copy of the object only containing the whitelisted properties.
|
649 | 0f4a8a68 | Olga Brani | _.pick = function(obj) { |
650 | 0f4a8a68 | Olga Brani | var result = {};
|
651 | 0f4a8a68 | Olga Brani | each(_.flatten(slice.call(arguments, 1)), function(key) { |
652 | 0f4a8a68 | Olga Brani | if (key in obj) result[key] = obj[key]; |
653 | 0f4a8a68 | Olga Brani | }); |
654 | 0f4a8a68 | Olga Brani | return result;
|
655 | 0f4a8a68 | Olga Brani | }; |
656 | 0f4a8a68 | Olga Brani | |
657 | 0f4a8a68 | Olga Brani | // Fill in a given object with default properties.
|
658 | 0f4a8a68 | Olga Brani | _.defaults = function(obj) { |
659 | 0f4a8a68 | Olga Brani | each(slice.call(arguments, 1), function(source) { |
660 | 0f4a8a68 | Olga Brani | for (var prop in source) { |
661 | 0f4a8a68 | Olga Brani | if (obj[prop] == null) obj[prop] = source[prop]; |
662 | 0f4a8a68 | Olga Brani | } |
663 | 0f4a8a68 | Olga Brani | }); |
664 | 0f4a8a68 | Olga Brani | return obj;
|
665 | 0f4a8a68 | Olga Brani | }; |
666 | 0f4a8a68 | Olga Brani | |
667 | 0f4a8a68 | Olga Brani | // Create a (shallow-cloned) duplicate of an object.
|
668 | 0f4a8a68 | Olga Brani | _.clone = function(obj) { |
669 | 0f4a8a68 | Olga Brani | if (!_.isObject(obj)) return obj; |
670 | 0f4a8a68 | Olga Brani | return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
|
671 | 0f4a8a68 | Olga Brani | }; |
672 | 0f4a8a68 | Olga Brani | |
673 | 0f4a8a68 | Olga Brani | // Invokes interceptor with the obj, and then returns obj.
|
674 | 0f4a8a68 | Olga Brani | // The primary purpose of this method is to "tap into" a method chain, in
|
675 | 0f4a8a68 | Olga Brani | // order to perform operations on intermediate results within the chain.
|
676 | 0f4a8a68 | Olga Brani | _.tap = function(obj, interceptor) { |
677 | 0f4a8a68 | Olga Brani | interceptor(obj); |
678 | 0f4a8a68 | Olga Brani | return obj;
|
679 | 0f4a8a68 | Olga Brani | }; |
680 | 0f4a8a68 | Olga Brani | |
681 | 0f4a8a68 | Olga Brani | // Internal recursive comparison function.
|
682 | 0f4a8a68 | Olga Brani | function eq(a, b, stack) { |
683 | 0f4a8a68 | Olga Brani | // Identical objects are equal. `0 === -0`, but they aren't identical.
|
684 | 0f4a8a68 | Olga Brani | // See the Harmony `egal` proposal: http://wiki.ecmascript.org/doku.php?id=harmony:egal.
|
685 | 0f4a8a68 | Olga Brani | if (a === b) return a !== 0 || 1 / a == 1 / b; |
686 | 0f4a8a68 | Olga Brani | // A strict comparison is necessary because `null == undefined`.
|
687 | 0f4a8a68 | Olga Brani | if (a == null || b == null) return a === b; |
688 | 0f4a8a68 | Olga Brani | // Unwrap any wrapped objects.
|
689 | 0f4a8a68 | Olga Brani | if (a._chain) a = a._wrapped;
|
690 | 0f4a8a68 | Olga Brani | if (b._chain) b = b._wrapped;
|
691 | 0f4a8a68 | Olga Brani | // Invoke a custom `isEqual` method if one is provided.
|
692 | 0f4a8a68 | Olga Brani | if (a.isEqual && _.isFunction(a.isEqual)) return a.isEqual(b); |
693 | 0f4a8a68 | Olga Brani | if (b.isEqual && _.isFunction(b.isEqual)) return b.isEqual(a); |
694 | 0f4a8a68 | Olga Brani | // Compare `[[Class]]` names.
|
695 | 0f4a8a68 | Olga Brani | var className = toString.call(a);
|
696 | 0f4a8a68 | Olga Brani | if (className != toString.call(b)) return false; |
697 | 0f4a8a68 | Olga Brani | switch (className) {
|
698 | 0f4a8a68 | Olga Brani | // Strings, numbers, dates, and booleans are compared by value.
|
699 | 0f4a8a68 | Olga Brani | case '[object String]': |
700 | 0f4a8a68 | Olga Brani | // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
|
701 | 0f4a8a68 | Olga Brani | // equivalent to `new String("5")`.
|
702 | 0f4a8a68 | Olga Brani | return a == String(b);
|
703 | 0f4a8a68 | Olga Brani | case '[object Number]': |
704 | 0f4a8a68 | Olga Brani | // `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
|
705 | 0f4a8a68 | Olga Brani | // other numeric values.
|
706 | 0f4a8a68 | Olga Brani | return a != +a ? b != +b : (a == 0 ? 1 / a == 1 / b : a == +b); |
707 | 0f4a8a68 | Olga Brani | case '[object Date]': |
708 | 0f4a8a68 | Olga Brani | case '[object Boolean]': |
709 | 0f4a8a68 | Olga Brani | // Coerce dates and booleans to numeric primitive values. Dates are compared by their
|
710 | 0f4a8a68 | Olga Brani | // millisecond representations. Note that invalid dates with millisecond representations
|
711 | 0f4a8a68 | Olga Brani | // of `NaN` are not equivalent.
|
712 | 0f4a8a68 | Olga Brani | return +a == +b;
|
713 | 0f4a8a68 | Olga Brani | // RegExps are compared by their source patterns and flags.
|
714 | 0f4a8a68 | Olga Brani | case '[object RegExp]': |
715 | 0f4a8a68 | Olga Brani | return a.source == b.source &&
|
716 | 0f4a8a68 | Olga Brani | a.global == b.global && |
717 | 0f4a8a68 | Olga Brani | a.multiline == b.multiline && |
718 | 0f4a8a68 | Olga Brani | a.ignoreCase == b.ignoreCase; |
719 | 0f4a8a68 | Olga Brani | } |
720 | 0f4a8a68 | Olga Brani | if (typeof a != 'object' || typeof b != 'object') return false; |
721 | 0f4a8a68 | Olga Brani | // Assume equality for cyclic structures. The algorithm for detecting cyclic
|
722 | 0f4a8a68 | Olga Brani | // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
|
723 | 0f4a8a68 | Olga Brani | var length = stack.length;
|
724 | 0f4a8a68 | Olga Brani | while (length--) {
|
725 | 0f4a8a68 | Olga Brani | // Linear search. Performance is inversely proportional to the number of
|
726 | 0f4a8a68 | Olga Brani | // unique nested structures.
|
727 | 0f4a8a68 | Olga Brani | if (stack[length] == a) return true; |
728 | 0f4a8a68 | Olga Brani | } |
729 | 0f4a8a68 | Olga Brani | // Add the first object to the stack of traversed objects.
|
730 | 0f4a8a68 | Olga Brani | stack.push(a); |
731 | 0f4a8a68 | Olga Brani | var size = 0, result = true; |
732 | 0f4a8a68 | Olga Brani | // Recursively compare objects and arrays.
|
733 | 0f4a8a68 | Olga Brani | if (className == '[object Array]') { |
734 | 0f4a8a68 | Olga Brani | // Compare array lengths to determine if a deep comparison is necessary.
|
735 | 0f4a8a68 | Olga Brani | size = a.length; |
736 | 0f4a8a68 | Olga Brani | result = size == b.length; |
737 | 0f4a8a68 | Olga Brani | if (result) {
|
738 | 0f4a8a68 | Olga Brani | // Deep compare the contents, ignoring non-numeric properties.
|
739 | 0f4a8a68 | Olga Brani | while (size--) {
|
740 | 0f4a8a68 | Olga Brani | // Ensure commutative equality for sparse arrays.
|
741 | 0f4a8a68 | Olga Brani | if (!(result = size in a == size in b && eq(a[size], b[size], stack))) break; |
742 | 0f4a8a68 | Olga Brani | } |
743 | 0f4a8a68 | Olga Brani | } |
744 | 0f4a8a68 | Olga Brani | } else {
|
745 | 0f4a8a68 | Olga Brani | // Objects with different constructors are not equivalent.
|
746 | 0f4a8a68 | Olga Brani | if ('constructor' in a != 'constructor' in b || a.constructor != b.constructor) return false; |
747 | 0f4a8a68 | Olga Brani | // Deep compare objects.
|
748 | 0f4a8a68 | Olga Brani | for (var key in a) { |
749 | 0f4a8a68 | Olga Brani | if (_.has(a, key)) {
|
750 | 0f4a8a68 | Olga Brani | // Count the expected number of properties.
|
751 | 0f4a8a68 | Olga Brani | size++; |
752 | 0f4a8a68 | Olga Brani | // Deep compare each member.
|
753 | 0f4a8a68 | Olga Brani | if (!(result = _.has(b, key) && eq(a[key], b[key], stack))) break; |
754 | 0f4a8a68 | Olga Brani | } |
755 | 0f4a8a68 | Olga Brani | } |
756 | 0f4a8a68 | Olga Brani | // Ensure that both objects contain the same number of properties.
|
757 | 0f4a8a68 | Olga Brani | if (result) {
|
758 | 0f4a8a68 | Olga Brani | for (key in b) { |
759 | 0f4a8a68 | Olga Brani | if (_.has(b, key) && !(size--)) break; |
760 | 0f4a8a68 | Olga Brani | } |
761 | 0f4a8a68 | Olga Brani | result = !size; |
762 | 0f4a8a68 | Olga Brani | } |
763 | 0f4a8a68 | Olga Brani | } |
764 | 0f4a8a68 | Olga Brani | // Remove the first object from the stack of traversed objects.
|
765 | 0f4a8a68 | Olga Brani | stack.pop(); |
766 | 0f4a8a68 | Olga Brani | return result;
|
767 | 0f4a8a68 | Olga Brani | } |
768 | 0f4a8a68 | Olga Brani | |
769 | 0f4a8a68 | Olga Brani | // Perform a deep comparison to check if two objects are equal.
|
770 | 0f4a8a68 | Olga Brani | _.isEqual = function(a, b) { |
771 | 0f4a8a68 | Olga Brani | return eq(a, b, []);
|
772 | 0f4a8a68 | Olga Brani | }; |
773 | 0f4a8a68 | Olga Brani | |
774 | 0f4a8a68 | Olga Brani | // Is a given array, string, or object empty?
|
775 | 0f4a8a68 | Olga Brani | // An "empty" object has no enumerable own-properties.
|
776 | 0f4a8a68 | Olga Brani | _.isEmpty = function(obj) { |
777 | 0f4a8a68 | Olga Brani | if (obj == null) return true; |
778 | 0f4a8a68 | Olga Brani | if (_.isArray(obj) || _.isString(obj)) return obj.length === 0; |
779 | 0f4a8a68 | Olga Brani | for (var key in obj) if (_.has(obj, key)) return false; |
780 | 0f4a8a68 | Olga Brani | return true; |
781 | 0f4a8a68 | Olga Brani | }; |
782 | 0f4a8a68 | Olga Brani | |
783 | 0f4a8a68 | Olga Brani | // Is a given value a DOM element?
|
784 | 0f4a8a68 | Olga Brani | _.isElement = function(obj) { |
785 | 0f4a8a68 | Olga Brani | return !!(obj && obj.nodeType == 1); |
786 | 0f4a8a68 | Olga Brani | }; |
787 | 0f4a8a68 | Olga Brani | |
788 | 0f4a8a68 | Olga Brani | // Is a given value an array?
|
789 | 0f4a8a68 | Olga Brani | // Delegates to ECMA5's native Array.isArray
|
790 | 0f4a8a68 | Olga Brani | _.isArray = nativeIsArray || function(obj) {
|
791 | 0f4a8a68 | Olga Brani | return toString.call(obj) == '[object Array]'; |
792 | 0f4a8a68 | Olga Brani | }; |
793 | 0f4a8a68 | Olga Brani | |
794 | 0f4a8a68 | Olga Brani | // Is a given variable an object?
|
795 | 0f4a8a68 | Olga Brani | _.isObject = function(obj) { |
796 | 0f4a8a68 | Olga Brani | return obj === Object(obj);
|
797 | 0f4a8a68 | Olga Brani | }; |
798 | 0f4a8a68 | Olga Brani | |
799 | 0f4a8a68 | Olga Brani | // Is a given variable an arguments object?
|
800 | 0f4a8a68 | Olga Brani | _.isArguments = function(obj) { |
801 | 0f4a8a68 | Olga Brani | return toString.call(obj) == '[object Arguments]'; |
802 | 0f4a8a68 | Olga Brani | }; |
803 | 0f4a8a68 | Olga Brani | if (!_.isArguments(arguments)) { |
804 | 0f4a8a68 | Olga Brani | _.isArguments = function(obj) { |
805 | 0f4a8a68 | Olga Brani | return !!(obj && _.has(obj, 'callee')); |
806 | 0f4a8a68 | Olga Brani | }; |
807 | 0f4a8a68 | Olga Brani | } |
808 | 0f4a8a68 | Olga Brani | |
809 | 0f4a8a68 | Olga Brani | // Is a given value a function?
|
810 | 0f4a8a68 | Olga Brani | _.isFunction = function(obj) { |
811 | 0f4a8a68 | Olga Brani | return toString.call(obj) == '[object Function]'; |
812 | 0f4a8a68 | Olga Brani | }; |
813 | 0f4a8a68 | Olga Brani | |
814 | 0f4a8a68 | Olga Brani | // Is a given value a string?
|
815 | 0f4a8a68 | Olga Brani | _.isString = function(obj) { |
816 | 0f4a8a68 | Olga Brani | return toString.call(obj) == '[object String]'; |
817 | 0f4a8a68 | Olga Brani | }; |
818 | 0f4a8a68 | Olga Brani | |
819 | 0f4a8a68 | Olga Brani | // Is a given value a number?
|
820 | 0f4a8a68 | Olga Brani | _.isNumber = function(obj) { |
821 | 0f4a8a68 | Olga Brani | return toString.call(obj) == '[object Number]'; |
822 | 0f4a8a68 | Olga Brani | }; |
823 | 0f4a8a68 | Olga Brani | |
824 | 0f4a8a68 | Olga Brani | // Is a given object a finite number?
|
825 | 0f4a8a68 | Olga Brani | _.isFinite = function(obj) { |
826 | 0f4a8a68 | Olga Brani | return _.isNumber(obj) && isFinite(obj);
|
827 | 0f4a8a68 | Olga Brani | }; |
828 | 0f4a8a68 | Olga Brani | |
829 | 0f4a8a68 | Olga Brani | // Is the given value `NaN`?
|
830 | 0f4a8a68 | Olga Brani | _.isNaN = function(obj) { |
831 | 0f4a8a68 | Olga Brani | // `NaN` is the only value for which `===` is not reflexive.
|
832 | 0f4a8a68 | Olga Brani | return obj !== obj;
|
833 | 0f4a8a68 | Olga Brani | }; |
834 | 0f4a8a68 | Olga Brani | |
835 | 0f4a8a68 | Olga Brani | // Is a given value a boolean?
|
836 | 0f4a8a68 | Olga Brani | _.isBoolean = function(obj) { |
837 | 0f4a8a68 | Olga Brani | return obj === true || obj === false || toString.call(obj) == '[object Boolean]'; |
838 | 0f4a8a68 | Olga Brani | }; |
839 | 0f4a8a68 | Olga Brani | |
840 | 0f4a8a68 | Olga Brani | // Is a given value a date?
|
841 | 0f4a8a68 | Olga Brani | _.isDate = function(obj) { |
842 | 0f4a8a68 | Olga Brani | return toString.call(obj) == '[object Date]'; |
843 | 0f4a8a68 | Olga Brani | }; |
844 | 0f4a8a68 | Olga Brani | |
845 | 0f4a8a68 | Olga Brani | // Is the given value a regular expression?
|
846 | 0f4a8a68 | Olga Brani | _.isRegExp = function(obj) { |
847 | 0f4a8a68 | Olga Brani | return toString.call(obj) == '[object RegExp]'; |
848 | 0f4a8a68 | Olga Brani | }; |
849 | 0f4a8a68 | Olga Brani | |
850 | 0f4a8a68 | Olga Brani | // Is a given value equal to null?
|
851 | 0f4a8a68 | Olga Brani | _.isNull = function(obj) { |
852 | 0f4a8a68 | Olga Brani | return obj === null; |
853 | 0f4a8a68 | Olga Brani | }; |
854 | 0f4a8a68 | Olga Brani | |
855 | 0f4a8a68 | Olga Brani | // Is a given variable undefined?
|
856 | 0f4a8a68 | Olga Brani | _.isUndefined = function(obj) { |
857 | 0f4a8a68 | Olga Brani | return obj === void 0; |
858 | 0f4a8a68 | Olga Brani | }; |
859 | 0f4a8a68 | Olga Brani | |
860 | 0f4a8a68 | Olga Brani | // Has own property?
|
861 | 0f4a8a68 | Olga Brani | _.has = function(obj, key) { |
862 | 0f4a8a68 | Olga Brani | return hasOwnProperty.call(obj, key);
|
863 | 0f4a8a68 | Olga Brani | }; |
864 | 0f4a8a68 | Olga Brani | |
865 | 0f4a8a68 | Olga Brani | // Utility Functions
|
866 | 0f4a8a68 | Olga Brani | // -----------------
|
867 | 0f4a8a68 | Olga Brani | |
868 | 0f4a8a68 | Olga Brani | // Run Underscore.js in *noConflict* mode, returning the `_` variable to its
|
869 | 0f4a8a68 | Olga Brani | // previous owner. Returns a reference to the Underscore object.
|
870 | 0f4a8a68 | Olga Brani | _.noConflict = function() { |
871 | 0f4a8a68 | Olga Brani | root._ = previousUnderscore; |
872 | 0f4a8a68 | Olga Brani | return this; |
873 | 0f4a8a68 | Olga Brani | }; |
874 | 0f4a8a68 | Olga Brani | |
875 | 0f4a8a68 | Olga Brani | // Keep the identity function around for default iterators.
|
876 | 0f4a8a68 | Olga Brani | _.identity = function(value) { |
877 | 0f4a8a68 | Olga Brani | return value;
|
878 | 0f4a8a68 | Olga Brani | }; |
879 | 0f4a8a68 | Olga Brani | |
880 | 0f4a8a68 | Olga Brani | // Run a function **n** times.
|
881 | 0f4a8a68 | Olga Brani | _.times = function (n, iterator, context) { |
882 | 0f4a8a68 | Olga Brani | for (var i = 0; i < n; i++) iterator.call(context, i); |
883 | 0f4a8a68 | Olga Brani | }; |
884 | 0f4a8a68 | Olga Brani | |
885 | 0f4a8a68 | Olga Brani | // Escape a string for HTML interpolation.
|
886 | 0f4a8a68 | Olga Brani | _.escape = function(string) { |
887 | 0f4a8a68 | Olga Brani | return (''+string).replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"').replace(/'/g, ''').replace(/\//g,'/'); |
888 | 0f4a8a68 | Olga Brani | }; |
889 | 0f4a8a68 | Olga Brani | |
890 | 0f4a8a68 | Olga Brani | // If the value of the named property is a function then invoke it;
|
891 | 0f4a8a68 | Olga Brani | // otherwise, return it.
|
892 | 0f4a8a68 | Olga Brani | _.result = function(object, property) { |
893 | 0f4a8a68 | Olga Brani | if (object == null) return null; |
894 | 0f4a8a68 | Olga Brani | var value = object[property];
|
895 | 0f4a8a68 | Olga Brani | return _.isFunction(value) ? value.call(object) : value;
|
896 | 0f4a8a68 | Olga Brani | }; |
897 | 0f4a8a68 | Olga Brani | |
898 | 0f4a8a68 | Olga Brani | // Add your own custom functions to the Underscore object, ensuring that
|
899 | 0f4a8a68 | Olga Brani | // they're correctly added to the OOP wrapper as well.
|
900 | 0f4a8a68 | Olga Brani | _.mixin = function(obj) { |
901 | 0f4a8a68 | Olga Brani | each(_.functions(obj), function(name){
|
902 | 0f4a8a68 | Olga Brani | addToWrapper(name, _[name] = obj[name]); |
903 | 0f4a8a68 | Olga Brani | }); |
904 | 0f4a8a68 | Olga Brani | }; |
905 | 0f4a8a68 | Olga Brani | |
906 | 0f4a8a68 | Olga Brani | // Generate a unique integer id (unique within the entire client session).
|
907 | 0f4a8a68 | Olga Brani | // Useful for temporary DOM ids.
|
908 | 0f4a8a68 | Olga Brani | var idCounter = 0; |
909 | 0f4a8a68 | Olga Brani | _.uniqueId = function(prefix) { |
910 | 0f4a8a68 | Olga Brani | var id = idCounter++;
|
911 | 0f4a8a68 | Olga Brani | return prefix ? prefix + id : id;
|
912 | 0f4a8a68 | Olga Brani | }; |
913 | 0f4a8a68 | Olga Brani | |
914 | 0f4a8a68 | Olga Brani | // By default, Underscore uses ERB-style template delimiters, change the
|
915 | 0f4a8a68 | Olga Brani | // following template settings to use alternative delimiters.
|
916 | 0f4a8a68 | Olga Brani | _.templateSettings = { |
917 | 0f4a8a68 | Olga Brani | evaluate : /<%([\s\S]+?)%>/g, |
918 | 0f4a8a68 | Olga Brani | interpolate : /<%=([\s\S]+?)%>/g, |
919 | 0f4a8a68 | Olga Brani | escape : /<%-([\s\S]+?)%>/g |
920 | 0f4a8a68 | Olga Brani | }; |
921 | 0f4a8a68 | Olga Brani | |
922 | 0f4a8a68 | Olga Brani | // When customizing `templateSettings`, if you don't want to define an
|
923 | 0f4a8a68 | Olga Brani | // interpolation, evaluation or escaping regex, we need one that is
|
924 | 0f4a8a68 | Olga Brani | // guaranteed not to match.
|
925 | 0f4a8a68 | Olga Brani | var noMatch = /.^/; |
926 | 0f4a8a68 | Olga Brani | |
927 | 0f4a8a68 | Olga Brani | // Certain characters need to be escaped so that they can be put into a
|
928 | 0f4a8a68 | Olga Brani | // string literal.
|
929 | 0f4a8a68 | Olga Brani | var escapes = {
|
930 | 0f4a8a68 | Olga Brani | '\\': '\\', |
931 | 0f4a8a68 | Olga Brani | "'": "'", |
932 | 0f4a8a68 | Olga Brani | 'r': '\r', |
933 | 0f4a8a68 | Olga Brani | 'n': '\n', |
934 | 0f4a8a68 | Olga Brani | 't': '\t', |
935 | 0f4a8a68 | Olga Brani | 'u2028': '\u2028', |
936 | 0f4a8a68 | Olga Brani | 'u2029': '\u2029' |
937 | 0f4a8a68 | Olga Brani | }; |
938 | 0f4a8a68 | Olga Brani | |
939 | 0f4a8a68 | Olga Brani | for (var p in escapes) escapes[escapes[p]] = p; |
940 | 0f4a8a68 | Olga Brani | var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g; |
941 | 0f4a8a68 | Olga Brani | var unescaper = /\\(\\|'|r|n|t|u2028|u2029)/g; |
942 | 0f4a8a68 | Olga Brani | |
943 | 0f4a8a68 | Olga Brani | // Within an interpolation, evaluation, or escaping, remove HTML escaping
|
944 | 0f4a8a68 | Olga Brani | // that had been previously added.
|
945 | 0f4a8a68 | Olga Brani | var unescape = function(code) { |
946 | 0f4a8a68 | Olga Brani | return code.replace(unescaper, function(match, escape) { |
947 | 0f4a8a68 | Olga Brani | return escapes[escape];
|
948 | 0f4a8a68 | Olga Brani | }); |
949 | 0f4a8a68 | Olga Brani | }; |
950 | 0f4a8a68 | Olga Brani | |
951 | 0f4a8a68 | Olga Brani | // JavaScript micro-templating, similar to John Resig's implementation.
|
952 | 0f4a8a68 | Olga Brani | // Underscore templating handles arbitrary delimiters, preserves whitespace,
|
953 | 0f4a8a68 | Olga Brani | // and correctly escapes quotes within interpolated code.
|
954 | 0f4a8a68 | Olga Brani | _.template = function(text, data, settings) { |
955 | 0f4a8a68 | Olga Brani | settings = _.defaults(settings || {}, _.templateSettings); |
956 | 0f4a8a68 | Olga Brani | |
957 | 0f4a8a68 | Olga Brani | // Compile the template source, taking care to escape characters that
|
958 | 0f4a8a68 | Olga Brani | // cannot be included in a string literal and then unescape them in code
|
959 | 0f4a8a68 | Olga Brani | // blocks.
|
960 | 0f4a8a68 | Olga Brani | var source = "__p+='" + text |
961 | 0f4a8a68 | Olga Brani | .replace(escaper, function(match) {
|
962 | 0f4a8a68 | Olga Brani | return '\\' + escapes[match]; |
963 | 0f4a8a68 | Olga Brani | }) |
964 | 0f4a8a68 | Olga Brani | .replace(settings.escape || noMatch, function(match, code) {
|
965 | 0f4a8a68 | Olga Brani | return "'+\n_.escape(" + unescape(code) + ")+\n'"; |
966 | 0f4a8a68 | Olga Brani | }) |
967 | 0f4a8a68 | Olga Brani | .replace(settings.interpolate || noMatch, function(match, code) {
|
968 | 0f4a8a68 | Olga Brani | return "'+\n(" + unescape(code) + ")+\n'"; |
969 | 0f4a8a68 | Olga Brani | }) |
970 | 0f4a8a68 | Olga Brani | .replace(settings.evaluate || noMatch, function(match, code) {
|
971 | 0f4a8a68 | Olga Brani | return "';\n" + unescape(code) + "\n;__p+='"; |
972 | 0f4a8a68 | Olga Brani | }) + "';\n";
|
973 | 0f4a8a68 | Olga Brani | |
974 | 0f4a8a68 | Olga Brani | // If a variable is not specified, place data values in local scope.
|
975 | 0f4a8a68 | Olga Brani | if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n'; |
976 | 0f4a8a68 | Olga Brani | |
977 | 0f4a8a68 | Olga Brani | source = "var __p='';" +
|
978 | 0f4a8a68 | Olga Brani | "var print=function(){__p+=Array.prototype.join.call(arguments, '')};\n" +
|
979 | 0f4a8a68 | Olga Brani | source + "return __p;\n";
|
980 | 0f4a8a68 | Olga Brani | |
981 | 0f4a8a68 | Olga Brani | var render = new Function(settings.variable || 'obj', '_', source); |
982 | 0f4a8a68 | Olga Brani | if (data) return render(data, _); |
983 | 0f4a8a68 | Olga Brani | var template = function(data) { |
984 | 0f4a8a68 | Olga Brani | return render.call(this, data, _); |
985 | 0f4a8a68 | Olga Brani | }; |
986 | 0f4a8a68 | Olga Brani | |
987 | 0f4a8a68 | Olga Brani | // Provide the compiled function source as a convenience for build time
|
988 | 0f4a8a68 | Olga Brani | // precompilation.
|
989 | 0f4a8a68 | Olga Brani | template.source = 'function(' + (settings.variable || 'obj') + '){\n' + |
990 | 0f4a8a68 | Olga Brani | source + '}';
|
991 | 0f4a8a68 | Olga Brani | |
992 | 0f4a8a68 | Olga Brani | return template;
|
993 | 0f4a8a68 | Olga Brani | }; |
994 | 0f4a8a68 | Olga Brani | |
995 | 0f4a8a68 | Olga Brani | // Add a "chain" function, which will delegate to the wrapper.
|
996 | 0f4a8a68 | Olga Brani | _.chain = function(obj) { |
997 | 0f4a8a68 | Olga Brani | return _(obj).chain();
|
998 | 0f4a8a68 | Olga Brani | }; |
999 | 0f4a8a68 | Olga Brani | |
1000 | 0f4a8a68 | Olga Brani | // The OOP Wrapper
|
1001 | 0f4a8a68 | Olga Brani | // ---------------
|
1002 | 0f4a8a68 | Olga Brani | |
1003 | 0f4a8a68 | Olga Brani | // If Underscore is called as a function, it returns a wrapped object that
|
1004 | 0f4a8a68 | Olga Brani | // can be used OO-style. This wrapper holds altered versions of all the
|
1005 | 0f4a8a68 | Olga Brani | // underscore functions. Wrapped objects may be chained.
|
1006 | 0f4a8a68 | Olga Brani | var wrapper = function(obj) { this._wrapped = obj; }; |
1007 | 0f4a8a68 | Olga Brani | |
1008 | 0f4a8a68 | Olga Brani | // Expose `wrapper.prototype` as `_.prototype`
|
1009 | 0f4a8a68 | Olga Brani | _.prototype = wrapper.prototype; |
1010 | 0f4a8a68 | Olga Brani | |
1011 | 0f4a8a68 | Olga Brani | // Helper function to continue chaining intermediate results.
|
1012 | 0f4a8a68 | Olga Brani | var result = function(obj, chain) { |
1013 | 0f4a8a68 | Olga Brani | return chain ? _(obj).chain() : obj;
|
1014 | 0f4a8a68 | Olga Brani | }; |
1015 | 0f4a8a68 | Olga Brani | |
1016 | 0f4a8a68 | Olga Brani | // A method to easily add functions to the OOP wrapper.
|
1017 | 0f4a8a68 | Olga Brani | var addToWrapper = function(name, func) { |
1018 | 0f4a8a68 | Olga Brani | wrapper.prototype[name] = function() {
|
1019 | 0f4a8a68 | Olga Brani | var args = slice.call(arguments); |
1020 | 0f4a8a68 | Olga Brani | unshift.call(args, this._wrapped);
|
1021 | 0f4a8a68 | Olga Brani | return result(func.apply(_, args), this._chain); |
1022 | 0f4a8a68 | Olga Brani | }; |
1023 | 0f4a8a68 | Olga Brani | }; |
1024 | 0f4a8a68 | Olga Brani | |
1025 | 0f4a8a68 | Olga Brani | // Add all of the Underscore functions to the wrapper object.
|
1026 | 0f4a8a68 | Olga Brani | _.mixin(_); |
1027 | 0f4a8a68 | Olga Brani | |
1028 | 0f4a8a68 | Olga Brani | // Add all mutator Array functions to the wrapper.
|
1029 | 0f4a8a68 | Olga Brani | each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) { |
1030 | 0f4a8a68 | Olga Brani | var method = ArrayProto[name];
|
1031 | 0f4a8a68 | Olga Brani | wrapper.prototype[name] = function() {
|
1032 | 0f4a8a68 | Olga Brani | var wrapped = this._wrapped; |
1033 | 0f4a8a68 | Olga Brani | method.apply(wrapped, arguments);
|
1034 | 0f4a8a68 | Olga Brani | var length = wrapped.length;
|
1035 | 0f4a8a68 | Olga Brani | if ((name == 'shift' || name == 'splice') && length === 0) delete wrapped[0]; |
1036 | 0f4a8a68 | Olga Brani | return result(wrapped, this._chain); |
1037 | 0f4a8a68 | Olga Brani | }; |
1038 | 0f4a8a68 | Olga Brani | }); |
1039 | 0f4a8a68 | Olga Brani | |
1040 | 0f4a8a68 | Olga Brani | // Add all accessor Array functions to the wrapper.
|
1041 | 0f4a8a68 | Olga Brani | each(['concat', 'join', 'slice'], function(name) { |
1042 | 0f4a8a68 | Olga Brani | var method = ArrayProto[name];
|
1043 | 0f4a8a68 | Olga Brani | wrapper.prototype[name] = function() {
|
1044 | 0f4a8a68 | Olga Brani | return result(method.apply(this._wrapped, arguments), this._chain); |
1045 | 0f4a8a68 | Olga Brani | }; |
1046 | 0f4a8a68 | Olga Brani | }); |
1047 | 0f4a8a68 | Olga Brani | |
1048 | 0f4a8a68 | Olga Brani | // Start chaining a wrapped Underscore object.
|
1049 | 0f4a8a68 | Olga Brani | wrapper.prototype.chain = function() { |
1050 | 0f4a8a68 | Olga Brani | this._chain = true; |
1051 | 0f4a8a68 | Olga Brani | return this; |
1052 | 0f4a8a68 | Olga Brani | }; |
1053 | 0f4a8a68 | Olga Brani | |
1054 | 0f4a8a68 | Olga Brani | // Extracts the result from a wrapped and chained object.
|
1055 | 0f4a8a68 | Olga Brani | wrapper.prototype.value = function() { |
1056 | 0f4a8a68 | Olga Brani | return this._wrapped; |
1057 | 0f4a8a68 | Olga Brani | }; |
1058 | 0f4a8a68 | Olga Brani | |
1059 | 0f4a8a68 | Olga Brani | }).call(this); |