98 lines
2.8 KiB
JavaScript
98 lines
2.8 KiB
JavaScript
// Cherry-picked bits of underscore.js, lodash.js
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/**
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* Lo-Dash 2.4.0 <http://lodash.com/>
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* Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <http://lodash.com/license>
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*/
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var ArrayProto = Array.prototype;
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var nativeForEach = ArrayProto.forEach;
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var nativeIndexOf = ArrayProto.indexOf;
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var nativeSome = ArrayProto.some;
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var ObjProto = Object.prototype;
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var hasOwnProperty = ObjProto.hasOwnProperty;
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var nativeKeys = Object.keys;
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var breaker = {};
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function has(obj, key) {
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return hasOwnProperty.call(obj, key);
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}
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var keys = nativeKeys || function(obj) {
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if (obj !== Object(obj)) throw new TypeError('Invalid object');
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var keys = [];
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for (var key in obj) if (has(obj, key)) keys.push(key);
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return keys;
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};
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function size(obj) {
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if (obj == null) return 0;
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return (obj.length === +obj.length) ? obj.length : keys(obj).length;
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}
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function identity(value) {
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return value;
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}
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function each(obj, iterator, context) {
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var i, length;
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if (obj == null) return;
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if (nativeForEach && obj.forEach === nativeForEach) {
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obj.forEach(iterator, context);
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} else if (obj.length === +obj.length) {
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for (i = 0, length = obj.length; i < length; i++) {
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if (iterator.call(context, obj[i], i, obj) === breaker) return;
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}
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} else {
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var keys = keys(obj);
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for (i = 0, length = keys.length; i < length; i++) {
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if (iterator.call(context, obj[keys[i]], keys[i], obj) === breaker) return;
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}
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}
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};
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function any(obj, iterator, context) {
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iterator || (iterator = identity);
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var result = false;
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if (obj == null) return result;
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if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
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each(obj, function(value, index, list) {
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if (result || (result = iterator.call(context, value, index, list))) return breaker;
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});
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return !!result;
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};
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function contains(obj, target) {
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if (obj == null) return false;
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if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
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return any(obj, function(value) {
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return value === target;
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});
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};
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function Wrapped(value) {
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this.value = value;
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}
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Wrapped.prototype.has = function(key) {
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return has(this.value, key);
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};
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Wrapped.prototype.contains = function(target) {
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return contains(this.value, target);
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};
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Wrapped.prototype.size = function() {
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return size(this.value);
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};
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function nodash(value) {
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// don't wrap if already wrapped, even if wrapped by a different `lodash` constructor
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return (value && typeof value == 'object' && !Array.isArray(value) && hasOwnProperty.call(value, '__wrapped__'))
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? value
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: new Wrapped(value);
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}
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module.exports = nodash;
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