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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 (<anonymous>)

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

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