# es-start

**Repository Path**: jaymii/es-start

## Basic Information

- **Project Name**: es-start
- **Description**: js es 学习
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2024-04-01
- **Last Updated**: 2024-04-12

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README


# ECMAScript
[ECMAScript Language Specification.](https://tc39.es/ecma262/multipage/)

# 个版本特性详细解析
[ECMAScript2015~2020语法全解析](http://es.xiecheng.live/)

## es5
[es5](https://www.ecma-international.org/ecma-262/5.1/)
* use strict
* String.trim()
* JSON.parse()
* JSON.stringify()
* Date.now()
* Object.defineProperty() 
* charAt()

**Array**
* Array.isArray()
* Array.prototype.forEach()
* Array.prototype.map()
* Array.prototype.filter()
* Array.prototype.reduce()
* Array.prototype.reduceRight()
* Array.prototype.every()
* Array.prototype.some()
* Array.prototype.indexOf() 
* Array.prototype.lastIndexOf()


## es6(2015)
(ECMAScript 6 入门)[https://es6.ruanyifeng.com/]
* let / const
* Destruction(解构赋值)
* Template String(模板字符串)
* Arrow Function(箭头函数)
* Classes and Inheritance(类和继承)
* 函数参数默认值
* Iterator(迭代器)
* Set / Map
* Symbol
* for...of
* Promise
* Generator(生成器)
* Proxy
* Reflect
* Module(模块)

## es7(2016)
* Array.prototype.includes()
* Exponentiation Operator(求幂运算符)

## es8(2017)
* async / await
* Object
  * Object.values()
  * Object.entries()
  * Object.getOwnPropertyDescriptors()
* String
  * String.padStart()
  * String.padEnd()
* Trailing Commas(尾逗号)

## es9(2018)
* Asynchronous Iteration, for await of(异步迭代)
* Object
  * Rest properties(剩余属性)
  * spread properties(展开参数)
* Promise.prototype.finally()
* RegExp
  * RegExp named capture groups(命名捕获组)
  * RegExp Unicode property escapes(Unicode属性转义)
* Template Literal Revision(模板文字修订)

## es10(2019)
* Array
  * Array.prototype.flat()
  * Array.prototype.flatMap()
* Object
  * Object.fromEntries()
* String
  * trimStart()
  * trimEnd()
* Symbol
  * Symbol.prototype.description
* Optional Catch Binding(可选捕获绑定)

## es11(2020)
* String
  * String.prototype.matchAll()
* BigInt
* globalThis
* Promise.allSettled()
* Nullish coalescing Operator(空值合并运算符)
* Optional Chaining Operator(可选链操作符)
* Dynamic Import(动态导入)

## es12(2021)
// todo