Object.entries pulls out an array of arrays based on the key/value pairs of the original object: [['a', 1],[' ... ... <看更多>

後來在ES5 新增了 Object.keys() ，終於可以擺脫 for-in 陳述句了，終於可以讓JS 物件(間接) 使用Array method 了！ Object.keys() 可直接取得 ... ... <看更多>

By chaining the Object.keys() with the forEach() method, you can access the ... The Object.values() takes an object as an argument and returns an array of ... ... <看更多>

This video talks about the differences between PHP simple and Associative arrays as well as how to use a ... ... <看更多>

import 'core-js'; // <- at the top of your entry point Array.from(new Set([1, 2, 3, 2, ... thisArg: any): Array<mixed>; forEach(callbackfn: (value: any, ... ... <看更多>

You cannot iterate over normal javascript simple array, it needs to be array of ... you cant' use index as a value of key, I found out that you can use it ... <看更多>