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48 lines
1.3 KiB
JavaScript
48 lines
1.3 KiB
JavaScript
9 years ago
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var arrayFilter = require('../internal/arrayFilter'),
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arrayMap = require('../internal/arrayMap'),
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baseProperty = require('../internal/baseProperty'),
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isArrayLike = require('../internal/isArrayLike');
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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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* 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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