mirror of
https://github.com/whoisclebs/lodash.git
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121 lines
3.6 KiB
JavaScript
121 lines
3.6 KiB
JavaScript
/**
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* lodash 3.2.0 (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 1.8.3 <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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restParam = require('lodash.restparam');
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/**
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* Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
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* of an array-like value.
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*/
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var MAX_SAFE_INTEGER = 9007199254740991;
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/**
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* The base implementation of `_.property` without support for deep paths.
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*
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* @private
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* @param {string} key The key of the property to get.
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* @returns {Function} Returns the new function.
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*/
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function baseProperty(key) {
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return function(object) {
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return object == null ? undefined : object[key];
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};
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}
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/**
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* Gets the "length" property value of `object`.
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*
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* **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
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* that affects Safari on at least iOS 8.1-8.3 ARM64.
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*
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* @private
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* @param {Object} object The object to query.
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* @returns {*} Returns the "length" value.
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*/
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var getLength = baseProperty('length');
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/**
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* Checks if `value` is array-like.
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
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*/
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function isArrayLike(value) {
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return value != null && isLength(getLength(value));
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}
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/**
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* Checks if `value` is a valid array-like length.
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*
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* **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
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*/
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function isLength(value) {
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return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
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}
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/**
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* Creates an array of unique values that are included in all of the provided
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* arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
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* for equality comparisons.
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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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var intersection = restParam(function(arrays) {
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var othLength = arrays.length,
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othIndex = othLength,
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caches = Array(length),
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indexOf = baseIndexOf,
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isCommon = true,
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result = [];
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while (othIndex--) {
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var value = arrays[othIndex] = isArrayLike(value = arrays[othIndex]) ? value : [];
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caches[othIndex] = (isCommon && value.length >= 120) ? createCache(othIndex && value) : null;
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}
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var array = arrays[0],
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index = -1,
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length = array ? array.length : 0,
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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)) < 0) {
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var othIndex = othLength;
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while (--othIndex) {
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var cache = caches[othIndex];
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if ((cache ? cacheIndexOf(cache, value) : indexOf(arrays[othIndex], value, 0)) < 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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