core-js ES6 ES7 cheatsheet

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ECMAScript 5 (ES5)：ECMAScript 的第五版修订，于 2009 年完成标准化。这个规范在所有现代浏览器中都相当完全的实现了。

ECMAScript 6 (ES2015/ES6) / ECMAScript 2015 (ES2015)：ECMAScript 的第六版修订，于 2015 年完成标准化。这个标准被部分实现于大部分现代浏览器。可以查阅这张兼容性表来查看不同浏览器和工具的实现情况。

ECMAScript 2016 (ES2016/ES7)：第七版 ECMAScript 修订.

ECMAScript 2017 (ES2017)

对常用的API作个简单说明(按需引入polyfill), 点此查看Github链接原文

下文中. 表示类方法/属性, # 表示实例方法/属性
ES5: All features moved to the es6 namespace, here just a list of features:

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Object
  .create(proto | null, descriptors?)    -> object
  .getPrototypeOf(object)                -> proto | null
  .defineProperty(target, key, desc)     -> target, cap for ie8-
  .defineProperties(target, descriptors) -> target, cap for ie8-
  .getOwnPropertyDescriptor(object, key) -> desc
  .getOwnPropertyNames(object)           -> array
  .keys(object)                          -> array
  .seal(object)                          -> object, cap for ie8-
  .freeze(object)                        -> object, cap for ie8-
  .preventExtensions(object)             -> object, cap for ie8-
  .isSealed(object)                      -> bool, cap for ie8-
  .isFrozen(object)                      -> bool, cap for ie8-
  .isExtensible(object)                  -> bool, cap for ie8-
Array
  .isArray(var)                                -> bool
  #slice(start?, end?)                         -> array, fix for ie7-
  #join(string = ',')                          -> string, fix for ie7-
  #indexOf(var, from?)                         -> int
  #lastIndexOf(var, from?)                     -> int
  #every(fn(val, index, @), that)              -> bool
  #some(fn(val, index, @), that)               -> bool
  #forEach(fn(val, index, @), that)            -> void
  #map(fn(val, index, @), that)                -> array
  #filter(fn(val, index, @), that)             -> array
  #reduce(fn(memo, val, index, @), memo?)      -> var
  #reduceRight(fn(memo, val, index, @), memo?) -> var
  #sort(fn?)                                   -> @, fixes for some engines
Function
  #bind(object, ...args) -> boundFn(...args)
String
  #split(separator, limit) -> array
  #trim()                  -> str
RegExp
  #toString() -> str
Number
  #toFixed(digits)        -> string
  #toPrecision(precision) -> string
parseInt(str, radix) -> int
parseFloat(str)      -> num
Date
  .now()         -> int
  #toISOString() -> string
  #toJSON()      -> string

ES6: Object

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Object
  .assign(target, ...src)                -> target
  .is(a, b)                              -> bool
  .setPrototypeOf(target, proto | null)  -> target (required __proto__ - IE11+)
  .create(object | null, descriptors?)   -> object
  .getPrototypeOf(var)                   -> object | null
  .defineProperty(object, key, desc)     -> target
  .defineProperties(object, descriptors) -> target
  .getOwnPropertyDescriptor(var, key)    -> desc | undefined
  .keys(var)                             -> array
  .getOwnPropertyNames(var)              -> array
  .freeze(var)                           -> var
  .seal(var)                             -> var
  .preventExtensions(var)                -> var
  .isFrozen(var)                         -> bool
  .isSealed(var)                         -> bool
  .isExtensible(var)                     -> bool
  #toString()                            -> string, ES6 fix: @@toStringTag support

ES6: Function

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Function
  #bind(object, ...args) -> boundFn(...args)
  #name                  -> string (IE9+)
  #@@hasInstance(var)    -> bool

ES6: Array

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Array
  .from(iterable | array-like, mapFn(val, index)?, that) -> array
  .of(...args)                                           -> array
  .isArray(var)                                          -> bool
  #copyWithin(target = 0, start = 0, end = @length)      -> @
  #fill(val, start = 0, end = @length)                   -> @
  #find(fn(val, index, @), that)                         -> val
  #findIndex(fn(val, index, @), that)                    -> index | -1
  #values()                                              -> iterator
  #keys()                                                -> iterator
  #entries()                                             -> iterator
  #join(string = ',')                                    -> string, fix for ie7-
  #slice(start?, end?)                                   -> array, fix for ie7-
  #indexOf(var, from?)                                   -> index | -1
  #lastIndexOf(var, from?)                               -> index | -1
  #every(fn(val, index, @), that)                        -> bool
  #some(fn(val, index, @), that)                         -> bool
  #forEach(fn(val, index, @), that)                      -> void
  #map(fn(val, index, @), that)                          -> array
  #filter(fn(val, index, @), that)                       -> array
  #reduce(fn(memo, val, index, @), memo?)                -> var
  #reduceRight(fn(memo, val, index, @), memo?)           -> var
  #sort(fn?)                                             -> @, invalid arguments fix
  #@@iterator()                                          -> iterator (values)
  #@@unscopables                                         -> object (cap)
Arguments
  #@@iterator() -> iterator (values, available only in core-js methods)

ES6: String

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String
  .fromCodePoint(...codePoints) -> str
  .raw({raw}, ...substitutions) -> str
  #includes(str, from?) -> bool
  #startsWith(str, from?) -> bool
  #endsWith(str, from?) -> bool
  #repeat(num) -> str
  #codePointAt(pos) -> uint
  #trim() -> str, ES6 fix
  #anchor(name)     -> str
  #big()            -> str
  #blink()          -> str
  #bold()           -> str
  #fixed()          -> str
  #fontcolor(color) -> str
  #fontsize(size)   -> str
  #italics()        -> str
  #link(url)        -> str
  #small()          -> str
  #strike()         -> str
  #sub()            -> str
  #sup()            -> str
  #@@iterator() -> iterator (code points)

ES6: RegExp

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[new] RegExp(pattern, flags?) -> regexp, ES6 fix: can alter flags (IE9+)
  #flags -> str (IE9+)
  #toString() -> str, ES6 fixes
  #@@match(str)             -> array | null
  #@@replace(str, replacer) -> string
  #@@search(str)            -> index
  #@@split(str, limit)      -> array
String
  #match(tpl)             -> var, ES6 fix for support @@match
  #replace(tpl, replacer) -> var, ES6 fix for support @@replace
  #search(tpl)            -> var, ES6 fix for support @@search
  #split(tpl, limit)      -> var, ES6 fix for support @@split, some fixes for old engines

ES6: Number

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[new] Number(var)         -> number | number object
  .isFinite(num)          -> bool
  .isNaN(num)             -> bool
  .isInteger(num)         -> bool
  .isSafeInteger(num)     -> bool
  .parseFloat(str)        -> num
  .parseInt(str)          -> int
  .EPSILON                -> num
  .MAX_SAFE_INTEGER       -> int
  .MIN_SAFE_INTEGER       -> int
  #toFixed(digits)        -> string, fixes
  #toPrecision(precision) -> string, fixes
parseFloat(str)           -> num, fixes
parseInt(str)             -> int, fixes

ES6: Math

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Math
  .acosh(num)     -> num
  .asinh(num)     -> num
  .atanh(num)     -> num
  .cbrt(num)      -> num
  .clz32(num)     -> uint
  .cosh(num)      -> num
  .expm1(num)     -> num
  .fround(num)    -> num
  .hypot(...args) -> num
  .imul(num, num) -> int
  .log1p(num)     -> num
  .log10(num)     -> num
  .log2(num)      -> num
  .sign(num)      -> 1 | -1 | 0 | -0 | NaN
  .sinh(num)      -> num
  .tanh(num)      -> num
  .trunc(num)     -> num

ES6: Date

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Date
  .now()               -> int
  #toISOString()       -> string
  #toJSON()            -> string
  #toString()          -> string
  #@@toPrimitive(hint) -> primitive

ES6: Promise

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new Promise(executor(resolve(var), reject(var))) -> promise
  #then(resolved(var), rejected(var))            -> promise
  #catch(rejected(var))                          -> promise
  .resolve(promise | var)                        -> promise
  .reject(var)                                   -> promise
  .all(iterable)                                 -> promise
  .race(iterable)                                -> promise

ES6: Collections

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new Map(iterable (entries) ?)     -> map
  #clear()                        -> void
  #delete(key)                    -> bool
  #forEach(fn(val, key, @), that) -> void
  #get(key)                       -> val
  #has(key)                       -> bool
  #set(key, val)                  -> @
  #size                           -> uint
  #values()                       -> iterator
  #keys()                         -> iterator
  #entries()                      -> iterator
  #@@iterator()                   -> iterator (entries)
  
new Set(iterable?)              -> set
  #add(key)                     -> @
  #clear()                      -> void
  #delete(key)                  -> bool
  #forEach(fn(el, el, @), that) -> void
  #has(key)                     -> bool
  #size                         -> uint
  #values()                     -> iterator
  #keys()                       -> iterator
  #entries()                    -> iterator
  #@@iterator()                 -> iterator (values)
  
new WeakMap(iterable (entries) ?) -> weakmap
  #delete(key)                    -> bool
  #get(key)                       -> val
  #has(key)                       -> bool
  #set(key, val)                  -> @

new WeakSet(iterable?) -> weakset
  #add(key)            -> @
  #delete(key)         -> bool
  #has(key)            -> bool

ES6: Symbol

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Symbol(description?)  -> symbol
  .hasInstance        -> @@hasInstance
  .isConcatSpreadable -> @@isConcatSpreadable
  .iterator           -> @@iterator
  .match              -> @@match
  .replace            -> @@replace
  .search             -> @@search
  .species            -> @@species
  .split              -> @@split
  .toPrimitive        -> @@toPrimitive
  .toStringTag        -> @@toStringTag
  .unscopables        -> @@unscopables
  .for(key)           -> symbol
  .keyFor(symbol)     -> key
  .useSimple()        -> void
  .useSetter()        -> void
Object
  .getOwnPropertySymbols(object) -> array

ES6: Typed Arrays

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new ArrayBuffer(length) -> buffer
  .isView(var) -> bool
  #slice(start = 0, end = @length) -> buffer
  #byteLength -> uint

new DataView(buffer, byteOffset = 0, byteLength = buffer.byteLength - byteOffset) -> view
  #getInt8(offset)                          -> int8
  #getUint8(offset)                         -> uint8
  #getInt16(offset, littleEndian = false)   -> int16
  #getUint16(offset, littleEndian = false)  -> uint16
  #getInt32(offset, littleEndian = false)   -> int32
  #getUint32(offset, littleEndian = false)  -> uint32
  #getFloat32(offset, littleEndian = false) -> float32
  #getFloat64(offset, littleEndian = false) -> float64
  #setInt8(offset, value)                          -> void
  #setUint8(offset, value)                         -> void
  #setInt16(offset, value, littleEndian = false)   -> void
  #setUint16(offset, value, littleEndian = false)  -> void
  #setInt32(offset, value, littleEndian = false)   -> void
  #setUint32(offset, value, littleEndian = false)  -> void
  #setFloat32(offset, value, littleEndian = false) -> void
  #setFloat64(offset, value, littleEndian = false) -> void
  #buffer     -> buffer
  #byteLength -> uint
  #byteOffset -> uint

{
  Int8Array,
  Uint8Array,
  Uint8ClampedArray,
  Int16Array,
  Uint16Array,
  Int32Array,
  Uint32Array,
  Float32Array,
  Float64Array
}
  new %TypedArray%(length)    -> typed
  new %TypedArray%(typed)     -> typed
  new %TypedArray%(arrayLike) -> typed
  new %TypedArray%(iterable)  -> typed
  new %TypedArray%(buffer, byteOffset = 0, length = (buffer.byteLength - byteOffset) / @BYTES_PER_ELEMENT) -> typed
  .BYTES_PER_ELEMENT -> uint
  .from(arrayLike | iterable, mapFn(val, index)?, that) -> typed
  .of(...args) -> typed
  #BYTES_PER_ELEMENT -> uint
  #copyWithin(target = 0, start = 0, end = @length) -> @
  #every(fn(val, index, @), that) -> bool
  #fill(val, start = 0, end = @length) -> @
  #filter(fn(val, index, @), that) -> typed
  #find(fn(val, index, @), that) -> val
  #findIndex(fn(val, index, @), that) -> index
  #forEach(fn(val, index, @), that) -> void
  #indexOf(var, from?) -> int
  #join(string = ',') -> string
  #lastIndexOf(var, from?) -> int
  #map(fn(val, index, @), that) -> typed
  #reduce(fn(memo, val, index, @), memo?) -> var
  #reduceRight(fn(memo, val, index, @), memo?) -> var
  #reverse() -> @
  #set(arrayLike, offset = 0) -> void
  #slice(start = 0, end = @length) -> typed
  #some(fn(val, index, @), that) -> bool
  #sort(fn(a, b)?) -> @
  #subarray(start = 0, end = @length) -> typed
  #toString() -> string
  #toLocaleString() -> string
  #values()     -> iterator
  #keys()       -> iterator
  #entries()    -> iterator
  #@@iterator() -> iterator (values)
  #buffer     -> buffer
  #byteLength -> uint
  #byteOffset -> uint
  #length     -> uint

ES6: Reflect

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Reflect
  .apply(target, thisArgument, argumentsList) -> var
  .construct(target, argumentsList, newTarget?) -> object
  .defineProperty(target, propertyKey, attributes) -> bool
  .deleteProperty(target, propertyKey) -> bool
  .enumerate(target) -> iterator (removed from the spec and will be removed from core-js@3)
  .get(target, propertyKey, receiver?) -> var
  .getOwnPropertyDescriptor(target, propertyKey) -> desc
  .getPrototypeOf(target) -> object | null
  .has(target, propertyKey) -> bool
  .isExtensible(target) -> bool
  .ownKeys(target) -> array
  .preventExtensions(target) -> bool
  .set(target, propertyKey, V, receiver?) -> bool
  .setPrototypeOf(target, proto) -> bool (required __proto__ - IE11+)

ES7: Stage 4 proposals

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Array
  #includes(var, from?) -> bool
{
  Int8Array,
  Uint8Array,
  Uint8ClampedArray,
  Int16Array,
  Uint16Array,
  Int32Array,
  Uint32Array,
  Float32Array,
  Float64Array
}
  #includes(var, from?) -> bool
  
Object
  .values(object) -> array
  .entries(object) -> array
  .getOwnPropertyDescriptors(object) -> object
  
String
  #padStart(length, fillStr = ' ') -> string
  #padEnd(length, fillStr = ' ') -> string
  
Object
  #__defineSetter__(key, fn) -> void
  #__defineGetter__(key, fn) -> void
  #__lookupSetter__(key) -> fn | void
  #__lookupGetter__(key) -> fn | void

ES7: Stage 3 proposals

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global -> object
System
  .global -> object (obsolete)

global.Array === Array; // => true

Promise
  #finally(onFinally()) -> promise
  
Symbol
  .asyncIterator -> @@asyncIterator

ES7: Stage 2 proposals

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String
  #trimLeft()  -> string
  #trimRight() -> string
  #trimStart() -> string
  #trimEnd()   -> string

ES7: Stage 1 proposals

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Promise
  .try(function()) -> promise

Array
  #flatten(depthArg = 1) -> array
  #flatMap(fn(val, key, @), that) -> array

Set
  .of(...args) -> set
  .from(iterable, mapFn(val, index)?, that?) -> set
Map
  .of(...args) -> map
  .from(iterable, mapFn(val, index)?, that?) -> map
WeakSet
  .of(...args) -> weakset
  .from(iterable, mapFn(val, index)?, that?) -> weakset
WeakMap
  .of(...args) -> weakmap
  .from(iterable, mapFn(val, index)?, that?) -> weakmap
  
String
  #matchAll(regexp) -> iterator
  
new Observable(fn)             -> observable
  #subscribe(observer)         -> subscription
  #forEach(fn)                 -> promise
  #@@observable()              -> @
  .of(...items)                -> observable
  .from(observable | iterable) -> observable
  .@@species                   -> @
Symbol
  .observable                  -> @@observable
  
Math
  .DEG_PER_RAD -> number
  .RAD_PER_DEG -> number
  .clamp(x, lower, upper) -> number
  .degrees(radians) -> number
  .fscale(x, inLow, inHigh, outLow, outHigh) -> number
  .radians(degrees) -> number
  .scale(x, inLow, inHigh, outLow, outHigh) -> number
  
Math
  .signbit(x) -> bool

…ES7: Stage 0 proposals and below