ut2/lib/unzip.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var native = require('./internals/native.js');
var isArray = require('./isArray.js');
var isArrayLikeObject = require('./isArrayLikeObject.js');

function unzip(array) {
    if (!isArray(array) || array.length === 0) {
        return [];
    }
    var length = 0;
    array = array.filter(function (group) {
        if (isArrayLikeObject(group)) {
            length = native.mathMax(group.length, length);
            return true;
        }
        return false;
    });
    var result = Array(length);
    var index = -1;
    while (++index < length) {
        var item = array.map(function (group) { return group[index]; });
        result[index] = item;
    }
    return result;
}

module.exports = unzip;