ES6 Set vs ES5 Array

Set

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set

const set = new Set()

// undefined

set.add(1)

// Set(1) {1}

set.add('some text')

// Set(2) {1, "some text"}

set.has(3)

// false

set.add(3);

// Set(3) {1, "some text", 3}

set.delete(2);

// false

set.delete(3);

// true

set[0];

// undefined

set.size;

// 2

Set 转换成 Array

const arr = [...set];

// undefined

arr;

// (2) [1, "some text"]

Map 转换成 Object

https://www.cnblogs.com/xgqfrms/p/13756665.html

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