ES6新增语法规则.md · 文档记录/docs-react

# ES6新增语法规则

Variables
  - let and const
  - TDZ error for too-early access of let or const declarations
  - Redefinition of const declarations not allowed
  - destructuring assignments/declarations for arrays and objects
  - ... operator

Data Types
  - For...of loop
  - Map, Set, WeakMap, WeakSet
  - Symbol
  - Symbols cannot be implicitly coerced

Number
  - Octal (e.g. 0o1 ) and binary (e.g. 0b10 ) literal forms
  - Old octal literal invalid now (e.g. 01 )
  - Static functions added to Math (e.g. Math.hypot(), Math.acosh(), Math.imul() )
  - Static functions added to Number (Number.isNaN(), Number.isInteger() )

String
  - Methods added to String.prototype (String.prototype.includes(), String.prototype.repeat() )
  - Unicode code-point escape form in string literals (e.g. \u{20BB7} )
  - Unicode code-point escape form in identifier names (e.g. var \u{20BB7} = 42; )
  - Unicode code-point escape form in regular expressions (e.g. var regexp = /\u{20BB7}/u; )
  - y flag for sticky regular expressions (e.g. /b/y )
  - Template String Literals

Function
  - arrow function
  - default function parameter values
  - destructuring for function parameters
  - Inferences for function name property for anonymous functions
  - Tail-call optimization for function calls and recursion

Array
  - Methods added to Array.prototype ([].fill(), [].find(), [].findIndex(), [].entries(), [].keys(), [].values() )
  - Static functions added to Array (Array.from(), Array.of() )
  - TypedArrays like Uint8Array, ArrayBuffer, Int8Array(), Int32Array(), Float64Array()
  - Some Array methods (e.g. Int8Array.prototype.slice(), Int8Array.prototype.join(), Int8Array.prototype.forEach() ) added to the TypedArray prototypes
  - Some Array statics (e.g. Uint32Array.from(), Uint32Array.of() ) added to the TypedArray constructors

Object
  - __proto__ in object literal definition sets [[Prototype]] link
  - Static functions added to Object (Object.getOwnPropertySymbols(), Object.assign() )
  - Object Literal Computed Property
  - Object Literal Property Shorthands
  - Proxies
  - Reflect

Generator and Promise
  - Generator function
  - Promises

Class
  - Class
  - super allowed in object methods
  - class ABC extends Array { .. }

Module
  - Module export command
  - Module import command

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