ES6 Map All In One
ES6 Map All In One
Map 字典/地图
Set 集合
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
Map with initializing
initial value
// ? 二维数组，作为初始值
const map = new Map([["(", ")"]]);
// Map(1) {"(" => ")"}
const map = new Map(["(", ")"]);
// ? Uncaught TypeError: Iterator value ( is not an entry object at new Map ()
const map = new Map({"(": ")"});
// ? Uncaught TypeError: object is not iterable (cannot read property Symbol(Symbol.iterator))
refs
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Cloning_and_merging_Maps
?xgqfrms 2012-2020
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