mirror of
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109 lines
3.1 KiB
JavaScript
109 lines
3.1 KiB
JavaScript
/**
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* lodash 3.2.1 (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 arrayFilter = require('lodash._arrayfilter'),
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arrayMap = require('lodash._arraymap');
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/* Native method references for those with the same name as other `lodash` methods. */
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var nativeMax = Math.max;
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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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* This method is like `_.zip` except that it accepts an array of grouped
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* elements and creates an array regrouping the elements to their pre-zip
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* configuration.
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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} array The array of grouped elements to process.
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* @returns {Array} Returns the new array of regrouped elements.
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* @example
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*
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* var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]);
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* // => [['fred', 30, true], ['barney', 40, false]]
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*
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* _.unzip(zipped);
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* // => [['fred', 'barney'], [30, 40], [true, false]]
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*/
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function unzip(array) {
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if (!(array && array.length)) {
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return [];
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}
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var index = -1,
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length = 0;
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array = arrayFilter(array, function(group) {
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if (isArrayLike(group)) {
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length = nativeMax(group.length, length);
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return true;
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}
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});
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var result = Array(length);
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while (++index < length) {
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result[index] = arrayMap(array, baseProperty(index));
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}
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return result;
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}
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module.exports = unzip;
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