JavaScript 意義不明

發表於 2018-01-04 | 更新於 2019-01-09 | 分類於 Javascript

覺得有趣

var ary = ['a', 'b', 'c'];
// ["a", "b", "c"]

var ary2 = ary.reduce((result, element) => result.concat(Array(3).fill(element)), []);

//["a", "a", "a", "b", "b", "b", "c", "c", "c"]