-> typed #toString() -> string #toLocaleString() -> string #values() -> iterator #keys() -> iterator #entries() -> iterator #@@iterator() -> iterator (values) #buffer -> buffer #byteLength -> uint #byteOffset -> uint #length -> uint

CommonJS entry points:

core-js(/library)/es6/typed
core-js(/library)/fn/typed
core-js(/library)/fn/typed/array-buffer
core-js(/library)/fn/typed/data-view
core-js(/library)/fn/typed/int8-array
core-js(/library)/fn/typed/uint8-array
core-js(/library)/fn/typed/uint8-clamped-array
core-js(/library)/fn/typed/int16-array
core-js(/library)/fn/typed/uint16-array
core-js(/library)/fn/typed/int32-array
core-js(/library)/fn/typed/uint32-array
core-js(/library)/fn/typed/float32-array
core-js(/library)/fn/typed/float64-array

Examples:

new Int32Array(4);                          // => [0, 0, 0, 0]
new Uint8ClampedArray([1, 2, 3, 666]);      // => [1, 2, 3, 255]
new Float32Array(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3]

var buffer = new ArrayBuffer(8);
var view   = new DataView(buffer);
view.setFloat64(0, 123.456, true);
new Uint8Array(buffer.slice(4)); // => [47, 221, 94, 64]

Int8Array.of(1, 1.5, 5.7, 745);      // => [1, 1, 5, -23]
Uint8Array.from([1, 1.5, 5.7, 745]); // => [1, 1, 5, 233]

var typed = new Uint8Array([1, 2, 3]);

var a = typed.slice(1);    // => [2, 3]
typed.buffer === a.buffer; // => false
var b = typed.subarray(1); // => [2, 3]
typed.buffer === b.buffer; // => true

typed.filter(it => it % 2); // => [1, 3]
typed.map(it => it * 1.5);  // => [1, 3, 4]

for(var val of typed)console.log(val);          // => 1, 2, 3
for(var val of typed.values())console.log(val); // => 1, 2, 3
for(var key of typed.keys())console.log(key);   // => 0, 1, 2
for(var [key, val] of typed.entries()){
  console.log(key);                             // => 0, 1, 2
  console.log(val);                             // => 1, 2, 3
}
Caveats when using typed arrays:

ECMAScript 6: Reflect

Modules es6.reflect.apply, es6.reflect.construct, es6.reflect.define-property, es6.reflect.delete-property, es6.reflect.enumerate, es6.reflect.get, es6.reflect.get-own-property-descriptor, es6.reflect.get-prototype-of, es6.reflect.has, es6.reflect.is-extensible, es6.reflect.own-keys, es6.reflect.prevent-extensions, es6.reflect.set, es6.reflect.set-prototype-of.

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+)

CommonJS entry points:

core-js(/library)/es6/reflect
core-js(/library)/fn/reflect
core-js(/library)/fn/reflect/apply
core-js(/library)/fn/reflect/construct
core-js(/library)/fn/reflect/define-property
core-js(/library)/fn/reflect/delete-property
core-js(/library)/fn/reflect/enumerate (deprecated and will be removed from the next major release)
core-js(/library)/fn/reflect/get
core-js(/library)/fn/reflect/get-own-property-descriptor
core-js(/library)/fn/reflect/get-prototype-of
core-js(/library)/fn/reflect/has
core-js(/library)/fn/reflect/is-extensible
core-js(/library)/fn/reflect/own-keys
core-js(/library)/fn/reflect/prevent-extensions
core-js(/library)/fn/reflect/set
core-js(/library)/fn/reflect/set-prototype-of

Examples:

var O = {a: 1};
Object.defineProperty(O, 'b', {value: 2});
O[Symbol('c')] = 3;
Reflect.ownKeys(O); // => ['a', 'b', Symbol(c)]

function C(a, b){
  this.c = a + b;
}

var instance = Reflect.construct(C, [20, 22]);
instance.c; // => 42

ECMAScript 7+ proposals

The TC39 process.

CommonJS entry points:

core-js(/library)/es7
core-js(/library)/es7/array
core-js(/library)/es7/global
core-js(/library)/es7/string
core-js(/library)/es7/map
core-js(/library)/es7/set
core-js(/library)/es7/error
core-js(/library)/es7/math
core-js(/library)/es7/system
core-js(/library)/es7/symbol
core-js(/library)/es7/reflect
core-js(/library)/es7/observable

core-js/stage/4 entry point contains only stage 4 proposals, core-js/stage/3 - stage 3 and stage 4, etc.

Stage 4 proposals

CommonJS entry points:

core-js(/library)/stage/4

[NaN].indexOf(NaN); // => -1 [NaN].includes(NaN); // => true Array(1).indexOf(undefined); // => -1 Array(1).includes(undefined); // => true

* `Object.values`, `Object.entries` [proposal](https://github.com/tc39/proposal-object-values-entries) - modules [`es7.object.values`](https://github.com/zloirock/core-js/blob/v2.5.5/modules/es7.object.values.js), [`es7.object.entries`](https://github.com/zloirock/core-js/blob/v2.5.5/modules/es7.object.entries.js)
```js
Object
  .values(object) -> array
  .entries(object) -> array

CommonJS entry points:

core-js(/library)/fn/object/values
core-js(/library)/fn/object/entries

Examples:

Object.values({a: 1, b: 2, c: 3});  // => [1, 2, 3]
Object.entries({a: 1, b: 2, c: 3}); // => [['a', 1], ['b', 2], ['c', 3]]

for(let [key, value] of Object.entries({a: 1, b: 2, c: 3})){
  console.log(key);   // => 'a', 'b', 'c'
  console.log(value); // => 1, 2, 3
}

Stage 3 proposals

CommonJS entry points:

core-js(/library)/stage/3

Promise.reject(42).finally(() => console.log('You will see it anyway'));

Stage 2 proposals

CommonJS entry points:

core-js(/library)/stage/2

Stage 1 proposals

CommonJS entry points:

core-js(/library)/stage/1

Promise.try(() => { throw 42; }).catch(it => console.log(Promise, rejected as ${it}));

* `Array#flatten` and `Array#flatMap` [proposal](https://tc39.github.io/proposal-flatMap) - modules [`es7.array.flatten`](https://github.com/zloirock/core-js/blob/v2.5.5/modules/es7.array.flatten.js) and [`es7.array.flat-map`](https://github.com/zloirock/core-js/blob/v2.5.5/modules/es7.array.flat-map.js)
```js
Array
  #flatten(depthArg = 1) -> array
  #flatMap(fn(val, key, @), that) -> array

CommonJS entry points:

core-js(/library)/fn/array/flatten
core-js(/library)/fn/array/flat-map
core-js(/library)/fn/array/virtual/flatten
core-js(/library)/fn/array/virtual/flat-map

Examples:

[1, [2, 3], [4, 5]].flatten();    // => [1, 2, 3, 4, 5]
[1, [2, [3, [4]]], 5].flatten();  // => [1, 2, [3, [4]], 5]
[1, [2, [3, [4]]], 5].flatten(3); // => [1, 2, 3, 4, 5]

[{a: 1, b: 2}, {a: 3, b: 4}, {a: 5, b: 6}].flatMap(it => [it.a, it.b]); // => [1, 2, 3, 4, 5, 6]

Map.from([[1, 2], [3, 4]], ([key, val]) => [key ** 2, val ** 2]); // => Map {1: 4, 9: 16}

* `String#matchAll` [proposal](https://github.com/tc39/String.prototype.matchAll) - module [`es7.string.match-all`](https://github.com/zloirock/core-js/blob/v2.5.5/modules/es7.string.match-all.js)
```js
String
  #matchAll(regexp) -> iterator

CommonJS entry points:

core-js(/library)/fn/string/match-all
core-js(/library)/fn/string/virtual/match-all

Examples:

for(let [_, d, D] of '1111a2b3cccc'.matchAll(/(\d)(\D)/)){
  console.log(d, D); // => 1 a, 2 b, 3 c
}

Stage 0 proposals

CommonJS entry points:

core-js(/library)/stage/0

Pre-stage 0 proposals

CommonJS entry points:

core-js(/library)/stage/pre

Web standards

CommonJS entry points:

core-js(/library)/web

setTimeout / setInterval

Module web.timers. Additional arguments fix for IE9-.

setTimeout(fn(...args), time, ...args) -> id
setInterval(fn(...args), time, ...args) -> id

CommonJS entry points:

core-js(/library)/web/timers
core-js(/library)/fn/set-timeout
core-js(/library)/fn/set-interval

// Before:
setTimeout(log.bind(null, 42), 1000);
// After:
setTimeout(log, 1000, 42);

setImmediate

Module web.immediate. setImmediate proposal polyfill.

setImmediate(fn(...args), ...args) -> id
clearImmediate(id) -> void

CommonJS entry points:

core-js(/library)/web/immediate
core-js(/library)/fn/set-immediate
core-js(/library)/fn/clear-immediate

Examples:

setImmediate(function(arg1, arg2){
  console.log(arg1, arg2); // => Message will be displayed with minimum delay
}, 'Message will be displayed', 'with minimum delay');

clearImmediate(setImmediate(function(){
  console.log('Message will not be displayed');
}));

Iterable DOM collections

Some DOM collections should have iterable interface or should be inherited from Array. That mean they should have keys, values, entries and @@iterator methods for iteration. So add them. Module web.dom.iterable:

{
  CSSRuleList,
  CSSStyleDeclaration,
  CSSValueList,
  ClientRectList,
  DOMRectList,
  DOMStringList,
  DOMTokenList,
  DataTransferItemList,
  FileList,
  HTMLAllCollection,
  HTMLCollection,
  HTMLFormElement,
  HTMLSelectElement,
  MediaList,
  MimeTypeArray,
  NamedNodeMap,
  NodeList,
  PaintRequestList,
  Plugin,
  PluginArray,
  SVGLengthList,
  SVGNumberList,
  SVGPathSegList,
  SVGPointList,
  SVGStringList,
  SVGTransformList,
  SourceBufferList,
  StyleSheetList,
  TextTrackCueList,
  TextTrackList,
  TouchList
}
  #@@iterator() -> iterator (values)

{
  DOMTokenList,
  NodeList
}
  #values()  -> iterator
  #keys()    -> iterator
  #entries() -> iterator

CommonJS entry points:

core-js(/library)/web/dom-collections
core-js(/library)/fn/dom-collections/iterator

Examples:

for(var {id} of document.querySelectorAll('*')){
  if(id)console.log(id);
}

for(var [index, {id}] of document.querySelectorAll('*').entries()){
  if(id)console.log(index, id);
}

Non-standard

CommonJS entry points:

core-js(/library)/core

Object

Modules core.object.is-object, core.object.classof, core.object.define, core.object.make.

Object
  .isObject(var) -> bool
  .classof(var) -> string
  .define(target, mixin) -> target
  .make(proto | null, mixin?) -> object

CommonJS entry points:

core-js(/library)/core/object
core-js(/library)/fn/object/is-object
core-js(/library)/fn/object/define
core-js(/library)/fn/object/make

Object classify examples:

Object.isObject({});    // => true
Object.isObject(isNaN); // => true
Object.isObject(null);  // => false

var classof = Object.classof;

classof(null);                 // => 'Null'
classof(undefined);            // => 'Undefined'
classof(1);                    // => 'Number'
classof(true);                 // => 'Boolean'
classof('string');             // => 'String'
classof(Symbol());             // => 'Symbol'

classof(new Number(1));        // => 'Number'
classof(new Boolean(true));    // => 'Boolean'
classof(new String('string')); // => 'String'

var fn   = function(){}
  , list = (function(){return arguments})(1, 2, 3);

classof({});                   // => 'Object'
classof(fn);                   // => 'Function'
classof([]);                   // => 'Array'
classof(list);                 // => 'Arguments'
classof(/./);                  // => 'RegExp'
classof(new TypeError);        // => 'Error'

classof(new Set);              // => 'Set'
classof(new Map);              // => 'Map'
classof(new WeakSet);          // => 'WeakSet'
classof(new WeakMap);          // => 'WeakMap'
classof(new Promise(fn));      // => 'Promise'

classof([].values());          // => 'Array Iterator'
classof(new Set().values());   // => 'Set Iterator'
classof(new Map().values());   // => 'Map Iterator'

classof(Math);                 // => 'Math'
classof(JSON);                 // => 'JSON'

function Example(){}
Example.prototype[Symbol.toStringTag] = 'Example';

classof(new Example);          // => 'Example'

Object.define and Object.make examples:

// Before:
Object.defineProperty(target, 'c', {
  enumerable: true,
  configurable: true,
  get: function(){
    return this.a + this.b;
  }
});

// After:
Object.define(target, {
  get c(){
    return this.a + this.b;
  }
});

// Shallow object cloning with prototype and descriptors:
var copy = Object.make(Object.getPrototypeOf(src), src);

// Simple inheritance:
function Vector2D(x, y){
  this.x = x;
  this.y = y;
}
Object.define(Vector2D.prototype, {
  get xy(){
    return Math.hypot(this.x, this.y);
  }
});
function Vector3D(x, y, z){
  Vector2D.apply(this, arguments);
  this.z = z;
}
Vector3D.prototype = Object.make(Vector2D.prototype, {
  constructor: Vector3D,
  get xyz(){
    return Math.hypot(this.x, this.y, this.z);
  }
});

var vector = new Vector3D(9, 12, 20);
console.log(vector.xy);  // => 15
console.log(vector.xyz); // => 25
vector.y++;
console.log(vector.xy);  // => 15.811388300841896
console.log(vector.xyz); // => 25.495097567963924

Dict

Module core.dict. Based on TC39 discuss / strawman.

[new] Dict(iterable (entries) | object ?) -> dict
  .isDict(var) -> bool
  .values(object) -> iterator
  .keys(object) -> iterator
  .entries(object) -> iterator (entries)
  .has(object, key) -> bool
  .get(object, key) -> val
  .set(object, key, value) -> object
  .forEach(object, fn(val, key, @), that) -> void
  .map(object, fn(val, key, @), that) -> new @
  .mapPairs(object, fn(val, key, @), that) -> new @
  .filter(object, fn(val, key, @), that) -> new @
  .some(object, fn(val, key, @), that) -> bool
  .every(object, fn(val, key, @), that) -> bool
  .find(object, fn(val, key, @), that) -> val
  .findKey(object, fn(val, key, @), that) -> key
  .keyOf(object, var) -> key
  .includes(object, var) -> bool
  .reduce(object, fn(memo, val, key, @), memo?) -> var

CommonJS entry points:

core-js(/library)/core/dict
core-js(/library)/fn/dict

Dict create object without prototype from iterable or simple object.

Examples:

var map = new Map([['a', 1], ['b', 2], ['c', 3]]);

Dict();                    // => {__proto__: null}
Dict({a: 1, b: 2, c: 3});  // => {__proto__: null, a: 1, b: 2, c: 3}
Dict(map);                 // => {__proto__: null, a: 1, b: 2, c: 3}
Dict([1, 2, 3].entries()); // => {__proto__: null, 0: 1, 1: 2, 2: 3}

var dict = Dict({a: 42});
dict instanceof Object;   // => false
dict.a;                   // => 42
dict.toString;            // => undefined
'a' in dict;              // => true
'hasOwnProperty' in dict; // => false

Dict.isDict({});     // => false
Dict.isDict(Dict()); // => true

Dict.keys, Dict.values and Dict.entries returns iterators for objects.

Examples:

var dict = {a: 1, b: 2, c: 3};

for(var key of Dict.keys(dict))console.log(key); // => 'a', 'b', 'c'

for(var val of Dict.values(dict))console.log(val); // => 1, 2, 3

for(var [key, val] of Dict.entries(dict)){
  console.log(key); // => 'a', 'b', 'c'
  console.log(val); // => 1, 2, 3
}

new Map(Dict.entries(dict)); // => Map {a: 1, b: 2, c: 3}

Basic dict operations for objects with prototype examples:

'q' in {q: 1};            // => true
'toString' in {};         // => true

Dict.has({q: 1}, 'q');    // => true
Dict.has({}, 'toString'); // => false

({q: 1})['q'];            // => 1
({}).toString;            // => function toString(){ [native code] }

Dict.get({q: 1}, 'q');    // => 1
Dict.get({}, 'toString'); // => undefined

var O = {};
O['q'] = 1;
O['q'];         // => 1
O['__proto__'] = {w: 2};
O['__proto__']; // => {w: 2}
O['w'];         // => 2

var O = {};
Dict.set(O, 'q', 1);
O['q'];         // => 1
Dict.set(O, '__proto__', {w: 2});
O['__proto__']; // => {w: 2}
O['w'];         // => undefined

Other methods of Dict module are static equivalents of Array.prototype methods for dictionaries.

Examples:

var dict = {a: 1, b: 2, c: 3};

Dict.forEach(dict, console.log, console);
// => 1, 'a', {a: 1, b: 2, c: 3}
// => 2, 'b', {a: 1, b: 2, c: 3}
// => 3, 'c', {a: 1, b: 2, c: 3}

Dict.map(dict, function(it){
  return it * it;
}); // => {a: 1, b: 4, c: 9}

Dict.mapPairs(dict, function(val, key){
  if(key != 'b')return [key + key, val * val];
}); // => {aa: 1, cc: 9}

Dict.filter(dict, function(it){
  return it % 2;
}); // => {a: 1, c: 3}

Dict.some(dict, function(it){
  return it === 2;
}); // => true

Dict.every(dict, function(it){
  return it === 2;
}); // => false

Dict.find(dict, function(it){
  return it > 2;
}); // => 3
Dict.find(dict, function(it){
  return it > 4;
}); // => undefined

Dict.findKey(dict, function(it){
  return it > 2;
}); // => 'c'
Dict.findKey(dict, function(it){
  return it > 4;
}); // => undefined

Dict.keyOf(dict, 2);    // => 'b'
Dict.keyOf(dict, 4);    // => undefined

Dict.includes(dict, 2); // => true
Dict.includes(dict, 4); // => false

Dict.reduce(dict, function(memo, it){
  return memo + it;
});     // => 6
Dict.reduce(dict, function(memo, it){
  return memo + it;
}, ''); // => '123'

Partial application

Module core.function.part.

Function
  #part(...args | _) -> fn(...args)

CommonJS entry points:

core-js/core/function
core-js(/library)/fn/function/part
core-js(/library)/fn/function/virtual/part
core-js(/library)/fn/_

Function#part partial apply function without this binding. Uses global variable _ (core._ for builds without global namespace pollution) as placeholder and not conflict with Underscore / LoDash.

Examples:

var fn1 = log.part(1, 2);
fn1(3, 4);    // => 1, 2, 3, 4

var fn2 = log.part(_, 2, _, 4);
fn2(1, 3);    // => 1, 2, 3, 4

var fn3 = log.part(1, _, _, 4);
fn3(2, 3);    // => 1, 2, 3, 4

fn2(1, 3, 5); // => 1, 2, 3, 4, 5
fn2(1);       // => 1, 2, undefined, 4

Number Iterator

Module core.number.iterator.

Number
  #@@iterator() -> iterator

CommonJS entry points:

core-js(/library)/core/number
core-js(/library)/fn/number/iterator
core-js(/library)/fn/number/virtual/iterator

Examples:

for(var i of 3)console.log(i); // => 0, 1, 2

[...10]; // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Array.from(10, Math.random); // => [0.9817775336559862, 0.02720663254149258, ...]

Array.from(10, function(it){
  return this + it * it;
}, .42); // => [0.42, 1.42, 4.42, 9.42, 16.42, 25.42, 36.42, 49.42, 64.42, 81.42]

Escaping strings

Modules core.regexp.escape, core.string.escape-html and core.string.unescape-html.

RegExp
  .escape(str) -> str
String
  #escapeHTML() -> str
  #unescapeHTML() -> str

CommonJS entry points:

core-js(/library)/core/regexp
core-js(/library)/core/string
core-js(/library)/fn/regexp/escape
core-js(/library)/fn/string/escape-html
core-js(/library)/fn/string/unescape-html
core-js(/library)/fn/string/virtual/escape-html
core-js(/library)/fn/string/virtual/unescape-html

Examples:

RegExp.escape('Hello, []{}()*+?.\\^$|!'); // => 'Hello, \[\]\{\}\(\)\*\+\?\.\\\^\$\|!'

'<script>doSomething();</script>'.escapeHTML(); // => '&lt;script&gt;doSomething();&lt;/script&gt;'
'&lt;script&gt;doSomething();&lt;/script&gt;'.unescapeHTML(); // => '<script>doSomething();</script>'

delay

Module core.delay. Promise-returning delay function, esdiscuss.

delay(ms) -> promise

CommonJS entry points:

core-js(/library)/core/delay
core-js(/library)/fn/delay

Examples:

delay(1e3).then(() => console.log('after 1 sec'));

(async () => {
  await delay(3e3);
  console.log('after 3 sec');

  while(await delay(3e3))console.log('each 3 sec');
})();

Helpers for iterators

Modules core.is-iterable, core.get-iterator, core.get-iterator-method - helpers for check iterability / get iterator in the library version or, for example, for arguments object:

core
  .isIterable(var) -> bool
  .getIterator(iterable) -> iterator
  .getIteratorMethod(var) -> function | undefined

CommonJS entry points:

core-js(/library)/fn/is-iterable
core-js(/library)/fn/get-iterator
core-js(/library)/fn/get-iterator-method

Examples:

var list = (function(){
  return arguments;
})(1, 2, 3);

console.log(core.isIterable(list)); // true;

var iter = core.getIterator(list);
console.log(iter.next().value); // 1
console.log(iter.next().value); // 2
console.log(iter.next().value); // 3
console.log(iter.next().value); // undefined

core.getIterator({});   // TypeError: [object Object] is not iterable!

var iterFn = core.getIteratorMethod(list);
console.log(typeof iterFn);     // 'function'
var iter = iterFn.call(list);
console.log(iter.next().value); // 1
console.log(iter.next().value); // 2
console.log(iter.next().value); // 3
console.log(iter.next().value); // undefined

console.log(core.getIteratorMethod({})); // undefined

Missing polyfills

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