mirror of
https://github.com/whoisclebs/lodash.git
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76 lines
2.3 KiB
JavaScript
76 lines
2.3 KiB
JavaScript
/**
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* lodash 3.0.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var baseIndexOf = require('lodash._baseindexof'),
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cacheIndexOf = require('lodash._cacheindexof'),
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createCache = require('lodash._createcache'),
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isArguments = require('lodash.isarguments'),
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isArray = require('lodash.isarray');
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/**
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* Creates an array of unique values in all provided arrays using `SameValueZero`
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* for equality comparisons.
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*
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* **Note:** `SameValueZero` comparisons are like strict equality comparisons,
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* e.g. `===`, except that `NaN` matches `NaN`. See the
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* [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
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* for more details.
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*
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* @static
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* @memberOf _
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* @category Array
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* @param {...Array} [arrays] The arrays to inspect.
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* @returns {Array} Returns the new array of shared values.
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* @example
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* _.intersection([1, 2], [4, 2], [2, 1]);
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* // => [2]
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*/
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function intersection() {
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var args = [],
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argsIndex = -1,
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argsLength = arguments.length,
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caches = [],
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indexOf = baseIndexOf,
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isCommon = true;
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while (++argsIndex < argsLength) {
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var value = arguments[argsIndex];
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if (isArray(value) || isArguments(value)) {
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args.push(value);
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caches.push(isCommon && value.length >= 120 && createCache(argsIndex && value));
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}
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}
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argsLength = args.length;
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var array = args[0],
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index = -1,
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length = array ? array.length : 0,
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result = [],
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seen = caches[0];
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outer:
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while (++index < length) {
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value = array[index];
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if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value)) < 0) {
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argsIndex = argsLength;
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while (--argsIndex) {
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var cache = caches[argsIndex];
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if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) {
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continue outer;
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}
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}
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if (seen) {
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seen.push(value);
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}
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result.push(value);
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}
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}
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return result;
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}
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module.exports = intersection;
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