unzipWith.js (1049B)
1 var apply = require('./_apply'), 2 arrayMap = require('./_arrayMap'), 3 unzip = require('./unzip'); 4 5 /** 6 * This method is like `_.unzip` except that it accepts `iteratee` to specify 7 * how regrouped values should be combined. The iteratee is invoked with the 8 * elements of each group: (...group). 9 * 10 * @static 11 * @memberOf _ 12 * @since 3.8.0 13 * @category Array 14 * @param {Array} array The array of grouped elements to process. 15 * @param {Function} [iteratee=_.identity] The function to combine 16 * regrouped values. 17 * @returns {Array} Returns the new array of regrouped elements. 18 * @example 19 * 20 * var zipped = _.zip([1, 2], [10, 20], [100, 200]); 21 * // => [[1, 10, 100], [2, 20, 200]] 22 * 23 * _.unzipWith(zipped, _.add); 24 * // => [3, 30, 300] 25 */ 26 function unzipWith(array, iteratee) { 27 if (!(array && array.length)) { 28 return []; 29 } 30 var result = unzip(array); 31 if (iteratee == null) { 32 return result; 33 } 34 return arrayMap(result, function(group) { 35 return apply(iteratee, undefined, group); 36 }); 37 } 38 39 module.exports = unzipWith;