ES6 Set & Map

合集 - ES6(82)

1.如何使用 js 实现一个 ES6 中 class 的 extends 功能 All In One2023-03-072.ECMAScript 2023 & Temporal All In One2022-11-273.js ES5 arguments & arguments.callee & this & ES6 new.target All In One2022-10-184.ES6 Map Object index All In One2022-06-055.TypeScript Decorator Metadata All In One2022-04-136.js ES6 Proxy All In One2022-02-137.js ES6 Reflect All In One2022-02-138.js @decorator All In One2021-12-039.Vue warn All In One2021-09-1710.ES6 解构赋值 All In One2021-09-0311.ES6 & export & export default All In One2021-07-2012.ES6 Async Await bug All In One2021-06-1013.ES6 destructuring assignment & default value & rename All In One2021-05-3114.ES6 Symbol All In One2021-03-0715.ES6 Map & WeakMap All In One2021-03-0716.ES6 Reflect All In One2021-03-0717.ES6 Proxy & Reflect All In One2021-03-0718.composition-api & setup2021-03-0519.ES6 Arrow Function & this bug2021-03-0320.ES5 arguments vs ES6 ...rest params All In One2021-02-2721.ES6 export & export.default All In One2021-02-2222.es6 string html2021-02-2023.js create Array ways All In One2021-02-1624.ES6 version repeatify2021-01-0525.es6 curry function2020-12-2926.JavaScript convert ES6 Map to Array All In One2020-12-2327.JavaScript string repeat methods All In One2020-12-0828.ES6 Set All In One2020-11-1829.ES6 Map All In One2020-11-1830.ES6 Arrow Function All In One2020-10-2831.如何用 js 实现一个 ES6 class 类函数 All In One2020-10-2032.ES6 进制字面量 All In One2020-10-1933.redux 中间件 redux-saga 使用教程2020-10-1234.how to convert Map to Object in js2020-10-0135.ES6 Set vs ES5 Array2020-10-0136.ES6 getter & setter2020-10-0137.ES6 arrow function vs ES5 function All In One2020-09-3038.ES6 Class vs ES5 constructor function All In One2020-09-3039.ES6 Generator vs ES6 async/await2020-09-3040.ES6 Map vs ES5 Object All In One2020-09-3041.js swap array2020-09-2242.ES6 ...rest In Action2020-09-1843.Webpack 4.x 默认支持 ES6 语法2020-08-1244.2020 面经(大前端，算法，设计模式，架构)2020-07-1745.js ES5 inheritance All In One2020-07-1046.JavaScript Learning Paths(ES5/ES6/ES-Next)2020-07-0947.ES5 function & ES6 class & method type2020-06-0448.Unicode & \u2028 & \u2029 & ES6 Template literals All In One2020-05-2749.random array & shuffle 洗牌算法 / 随机算法2019-12-0350.js in depth: ES6 destructuring assignment2019-11-2851.gradient text & gradient background2019-11-1852.V8 & ECMAScript & ES-Next2019-09-0853.js 数据劫持 (应用场景) All In One2019-08-2854.ES6 Arrow Function return Object2019-08-2255.ES6 Class & super All In One2019-08-2156.ES6 & tagged-template-literals & template strings All In One2019-08-1657.Enums & JavasScript & TypeScript2019-08-1358.es6 & map & set2019-07-2459.ES6 & import * & import default & import JSON All In One2019-07-0860.vue @ path2019-06-1761.ES6 & Classes & Interface2019-06-0662.ES6 & class extends All In One2019-06-0563.Google Advanced Search operators All In One2019-05-2064.React Native & ES6 & emoji All In One2019-04-2565.ES6 & Map & hashMap2019-04-0766.array to object2018-12-18

67.ES6 Set & Map2018-12-11

68.ES6 Destructuring Assignment All In One2018-11-1469.vue & lifecycle methods & this bug & ES6 Arrow function & this bind bug2018-11-1470.HTML Imports & polyfill2018-10-2371.yarn & vue-cli & hui-cli All In One2018-09-1372.ES6 Map & WeakMap & ES6 Set & WeakSet2018-07-1973.ES6 polyfills & String.includes() & Array.includes()2018-06-2874.ES6 Arrow Function & this bug2018-06-2075.ES6 Proxies2018-06-1176.ES6 import json2018-06-0877.disable VS Code auto format javascript when save codes2018-06-0878.how to create a javascript components framework using HTML5, CSS3, ES6 All In One2018-05-2979.eslint es6 syntax & object rest spread2018-05-0380.!function() & IIFE2017-10-2581.React.createClass vs. ES6 Class Components2017-02-1982.ES2015 (ES6) 新特性： 20 个2016-07-10

收起

ES6 Set & Map

Map & Set

https://github.com/xgqfrms/RAIO/issues/167

ES6 Map

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

const arr = [
    "INNERCODE", "SECUCODE", "SECUABBR", "TRADINGDAY", "LASTWEEKTRADINGDAY", "CLOSEPRICE", "CHANGE", "CHANGERANGE",
    "INNERCODE", "SECUCODE", "SECUABBR", "TRADINGDAY", "LASTWEEKTRADINGDAY", "CLOSEPRICE", "CHANGE", "CHANGERANGE",
];

let map_arr = new Map(arr);
// Uncaught TypeError: Iterator value INNERCODE is not an entry object at new Map (<anonymous>)

let set_arr = new Set(arr);
// Set(8) {"INNERCODE", "SECUCODE", "SECUABBR", "TRADINGDAY", "LASTWEEKTRADINGDAY", …}

let new_arr = [...set_arr];
// (8) ["INNERCODE", "SECUCODE", "SECUABBR", "TRADINGDAY", "LASTWEEKTRADINGDAY", "CLOSEPRICE", "CHANGE", "CHANGERANGE"]

ES6 Set

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

let mySet = new Set();

mySet.add(1); 
// Set [ 1 ]

mySet.add(5); 
// Set [ 1, 5 ]

mySet.add(5);
 // Set [ 1, 5 ]

mySet.add('some text');
// Set [ 1, 5, 'some text' ]

setter

setter - JavaScript | MDN

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set

Set

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

const set1 = new Set([1, 2, 3, 4, 5]);

console.log(set1.has(1));
// expected output: true

console.log(set1.has(7));
// expected output: false

console.log(set1.add(7));
// expected output: true

console.log(set1.has(7));
// expected output: true

console.log(set1.has(6));
// expected output: false

refs

---

---

©xgqfrms 2012-2020

www.cnblogs.com 发布文章使用：只允许注册用户才可以访问！

---