core-js

Modular compact standard library for JavaScript. Includes polyfills for ECMAScript 5, ECMAScript 6: symbols, collections, iterators, promises, ECMAScript 7 proposals; setImmediate, array generics. Some additional features such as dictionaries or extended partial application. You can require only standardized features polyfills, use features without global namespace pollution or create a custom build.

Example:

Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3]
'*'.repeat(10);                       // => '**********'
Promise.resolve(32).then(log);        // => 32
setImmediate(log, 42);                // => 42

Without global namespace pollution:

var core = require('core-js/library'); // With a modular system, otherwise use global `core`
core.Array.from(new core.Set([1, 2, 3, 2, 1])); // => [1, 2, 3]
core.String.repeat('*', 10);                    // => '**********'
core.Promise.resolve(32).then(core.log);        // => 32
core.setImmediate(core.log, 42);                // => 42

Usage

Basic

npm i core-js
bower install core.js

// Default
require('core-js');
// Without global namespace pollution
var core = require('core-js/library');
// Shim only
require('core-js/shim');

If you need complete build for browser, use builds from core-js/client path: default, without global namespace pollution, shim only.

Warning: if you uses core-js with extension of native objects, require all needed core-js modules at the beginning of entry point of your application, otherwise maybe conflicts.

CommonJS

You can require only needed modules.

require('core-js/es5'); // if you need support IE8-
require('core-js/fn/set');
require('core-js/fn/array/from');
require('core-js/fn/array/find-index');
Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3]
[1, 2, NaN, 3, 4].findIndex(isNaN);   // => 2

// or, w/o global namespace pollution:

var core      = require('core-js/library/es5'); // if you need support IE8-
var Set       = require('core-js/library/fn/set');
var from      = require('core-js/library/fn/array/from');
var findIndex = require('core-js/library/fn/array/find-index');
from(new Set([1, 2, 3, 2, 1]));      // => [1, 2, 3]
findIndex([1, 2, NaN, 3, 4], isNaN); // => 2

Available entry points for methods / constructors, as above examples, excluding features from es5 module (this module requires completely in ES3 environment before all other modules).

Available namespaces: for example, core-js/es6/array (core-js/library/es6/array) contains all ES6 Array features, core-js/es6 (core-js/library/es6) contains all ES6 features.

Custom build

npm i core-js && cd node_modules/core-js && npm i
npm run grunt build:core.dict,es6 -- --blacklist=es6.promise,es6.math --library=on --path=custom uglify

Where core.dict and es6 are modules (namespaces) names, which will be added to the build, es6.promise and es6.math are modules (namespaces) names, which will be excluded from the build, --library=on is flag for build without global namespace pollution and custom is target file name.

Available namespaces: for example, es6.array contains ES6 Array features, es6 contains all modules whose names start with es6.

Available custom build from js code (required webpack):

require('core-js/build')({
  modules: ['es6', 'core.dict'], // modules / namespaces
  blacklist: ['es6.reflect'],    // blacklist of modules / namespaces
  library: false,                // flag for build without global namespace pollution
}, function(err, code){          // callback
  // ...
});

API:

ECMAScript 5

Module es5, nothing new - without examples.

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
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
Function
  #bind(object, ...args) -> boundFn(...args)
Date
  .now() -> int
  #toISOString() -> string

Some features moved to another modules / namespaces, but available as part of es5 namespace too:

Object
  .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-
String
  #trim() -> str

ECMAScript 6

ECMAScript 6: Object & Function

Modules es6.object.assign, es6.object.is, es6.object.set-prototype-of, es6.object.to-string, es6.function.name and es6.function.has-instance.

Object
  .assign(target, ...src) -> target
  .is(a, b) -> bool
  .setPrototypeOf(target, proto | null) -> target, sham (required __proto__)
  #toString() -> string, ES6 fix: @@toStringTag support
Function
  #name -> string (IE9+)
  #@@hasInstance(var) -> bool

Example:

var foo = {q: 1, w: 2}
  , bar = {e: 3, r: 4}
  , baz = {t: 5, y: 6};
Object.assign(foo, bar, baz); // => foo = {q: 1, w: 2, e: 3, r: 4, t: 5, y: 6}

Object.is(NaN, NaN); // => true
Object.is(0, -0);    // => false
Object.is(42, 42);   // => true
Object.is(42, '42'); // => false

function Parent(){}
function Child(){}
Object.setPrototypeOf(Child.prototype, Parent.prototype);
new Child instanceof Child;  // => true
new Child instanceof Parent; // => true

var O = {};
O[Symbol.toStringTag] = 'Foo';
'' + O; // => '[object Foo]'

(function foo(){}).name // => 'foo'

In ES6 most Object static methods should work with primitives. Modules es6.object.freeze, es6.object.seal, es6.object.prevent-extensions, es6.object.is-frozen, es6.object.is-sealed, es6.object.is-extensible, es6.object.get-own-property-descriptor, es6.object.get-prototype-of, es6.object.keys, es6.object.get-own-property-names.

Object
  .freeze(var) -> var
  .seal(var) -> var
  .preventExtensions(var) -> var
  .isFrozen(var) -> bool
  .isSealed(var) -> bool
  .isExtensible(var) -> bool
  .getOwnPropertyDescriptor(var, key) -> desc | undefined
  .getPrototypeOf(var) -> object | null
  .keys(var) -> array
  .getOwnPropertyNames(var) -> array

Example:

Object.keys('qwe'); // => ['0', '1', '2']
Object.getPrototypeOf('qwe') === String.prototype; // => true

ECMAScript 6: Array

Modules es6.array.from, es6.array.of, es6.array.copy-within, es6.array.fill, es6.array.find and es6.array.find-index.

Array
  .from(iterable | array-like, mapFn(val, index)?, that) -> array
  .of(...args) -> array
  #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
  #@@unscopables -> object (cap)

Example:

Array.from(new Set([1, 2, 3, 2, 1]));      // => [1, 2, 3]
Array.from({0: 1, 1: 2, 2: 3, length: 3}); // => [1, 2, 3]
Array.from('123', Number);                 // => [1, 2, 3]
Array.from('123', function(it){
  return it * it;
});                                        // => [1, 4, 9]

Array.of(1);       // => [1]
Array.of(1, 2, 3); // => [1, 2, 3]

function isOdd(val){
  return val % 2;
}
[4, 8, 15, 16, 23, 42].find(isOdd);      // => 15
[4, 8, 15, 16, 23, 42].findIndex(isOdd); // => 2
[4, 8, 15, 16, 23, 42].find(isNaN);      // => undefined
[4, 8, 15, 16, 23, 42].findIndex(isNaN); // => -1

Array(5).fill(42); // => [42, 42, 42, 42, 42]

[1, 2, 3, 4, 5].copyWithin(0, 3); // => [4, 5, 3, 4, 5]

ECMAScript 6: String & RegExp

String: modules es6.string.from-code-point, es6.string.raw, es6.string.code-point-at, es6.string.ends-with, es6.string.includes, es6.string.repeat, es6.string.starts-with and es6.string.trim.

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

RegExp: modules es6.regexp.constructor and es6.regexp.flags.

[new] RegExp(pattern, flags?) -> regexp, ES6 fix: can alter flags (IE9+)
  #flags -> str (IE9+)

Support well-known symbols @@match, @@replace, @@search and @@split: modules es6.regexp.match, es6.regexp.replace, es6.regexp.search and es6.regexp.split.

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
RegExp
  #@@match(str) -> array | null
  #@@replace(str, replacer) -> string
  #@@search(str) -> index
  #@@split(str, limit) -> array

Examples:

'foobarbaz'.includes('bar');      // => true
'foobarbaz'.includes('bar', 4);   // => false
'foobarbaz'.startsWith('foo');    // => true
'foobarbaz'.startsWith('bar', 3); // => true
'foobarbaz'.endsWith('baz');      // => true
'foobarbaz'.endsWith('bar', 6);   // => true

'string'.repeat(3); // => 'stringstringstring'

'𠮷'.codePointAt(0); // => 134071
String.fromCodePoint(97, 134071, 98); // => 'a𠮷b'

var name = 'Bob';
String.raw`Hi\n${name}!`;           // => 'Hi\\nBob!' (ES6 template string syntax)
String.raw({raw: 'test'}, 0, 1, 2); // => 't0e1s2t'

RegExp(/./g, 'm'); // => /./m

/foo/.flags;    // => ''
/foo/gim.flags; // => 'gim'

'foo'.match({[Symbol.match]: _ => 1});     // => 1
'foo'.replace({[Symbol.replace]: _ => 2}); // => 2
'foo'.search({[Symbol.search]: _ => 3});   // => 3
'foo'.split({[Symbol.split]: _ => 4});     // => 4

ECMAScript 6: Number & Math

Module es6.number.constructor. Number constructor support binary and octal literals, example:

Number('0b1010101'); // => 85
Number('0o7654321'); // => 2054353

Number: modules es6.number.epsilon, es6.number.is-finite, es6.number.is-integer, es6.number.is-nan, es6.number.is-safe-integer, es6.number.max-safe-integer, es6.number.min-safe-integer, es6.number.parse-float, es6.number.parse-int.

Number
  .EPSILON -> num
  .isFinite(num) -> bool
  .isInteger(num) -> bool
  .isNaN(num) -> bool
  .isSafeInteger(num) -> bool
  .MAX_SAFE_INTEGER -> int
  .MIN_SAFE_INTEGER -> int
  .parseFloat(str) -> num
  .parseInt(str) -> int

Math: modules es6.math.acosh, es6.math.asinh, es6.math.atanh, es6.math.cbrt, es6.math.clz32, es6.math.cosh, es6.math.expm1, es6.math.fround, es6.math.hypot, es6.math.imul, es6.math.log10, es6.math.log1p, es6.math.log2, es6.math.sign, es6.math.sinh, es6.math.tanh, es6.math.trunc.

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

ECMAScript 6: Symbols

Module es6.symbol.

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

Also wrapped some Object methods for correct work with Symbol polyfill.

Object
  .create(proto | null, descriptors?) -> object
  .defineProperty(target, key, desc) -> target
  .defineProperties(target, descriptors) -> target
  .getOwnPropertyDescriptor(var, key) -> desc | undefined
  .getOwnPropertyNames(var) -> array
  #propertyIsEnumerable(key) -> bool

Basic example:

var Person = (function(){
  var NAME = Symbol('name');
  function Person(name){
    this[NAME] = name;
  }
  Person.prototype.getName = function(){
    return this[NAME];
  };
  return Person;
})();

var person = new Person('Vasya');
log(person.getName());          // => 'Vasya'
log(person['name']);            // => undefined
log(person[Symbol('name')]);    // => undefined, symbols are uniq
for(var key in person)log(key); // => only 'getName', symbols are not enumerable

Symbol.for & Symbol.keyFor example:

var symbol = Symbol.for('key');
symbol === Symbol.for('key'); // true
Symbol.keyFor(symbol);        // 'key'

Example with methods for getting own object keys:

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

Caveats when using `Symbol` polyfill:

We can't add new primitive type, Symbol returns object.
Symbol.for and Symbol.keyFor can't be shimmed cross-realm.
By default, to hide the keys, Symbol polyfill defines setter in Object.prototype. For this reason, uncontrolled creation of symbols can cause memory leak and the in operator is not working correctly with Symbol polyfill: Symbol() in {} // => true.

You can disable defining setters in Object.prototype. Example:

Symbol.useSimple();
var s1 = Symbol('s1')
  , o1 = {};
o1[s1] = true;
for(var key in o1)log(key); // => 'Symbol(s1)_t.qamkg9f3q', w/o native Symbol

Symbol.useSetter();
var s2 = Symbol('s2')
  , o2 = {};
o2[s2] = true;
for(var key in o2)log(key); // nothing

Currently, core-js not adds setters to Object.prototype for well-known symbols for correct work something like Symbol.iterator in foo. It can cause problems with their enumerability.

ECMAScript 6: Collections

core-js uses native collections in most case, just fixes methods / constructor, if it's required, and in old environment uses fast polyfill (O(1) lookup).

Map

Module es6.map. About iterators from this module here.

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

Example:

var a = [1];

var map = new Map([['a', 1], [42, 2]]);
map.set(a, 3).set(true, 4);

log(map.size);        // => 4
log(map.has(a));      // => true
log(map.has([1]));    // => false
log(map.get(a));      // => 3
map.forEach(function(val, key){
  log(val);           // => 1, 2, 3, 4
  log(key);           // => 'a', 42, [1], true
});
map.delete(a);
log(map.size);        // => 3
log(map.get(a));      // => undefined
log(Array.from(map)); // => [['a', 1], [42, 2], [true, 4]]

Set

Module es6.set. About iterators from this module here.

new Set(iterable?) -> set
  #add(key) -> @
  #clear() -> void
  #delete(key) -> bool
  #forEach(fn(el, el, @), that) -> void
  #has(key) -> bool
  #size -> uint

Example:

var set = new Set(['a', 'b', 'a', 'c']);
set.add('d').add('b').add('e');
log(set.size);        // => 5
log(set.has('b'));    // => true
set.forEach(function(it){
  log(it);            // => 'a', 'b', 'c', 'd', 'e'
});
set.delete('b');
log(set.size);        // => 4
log(set.has('b'));    // => false
log(Array.from(set)); // => ['a', 'c', 'd', 'e']

WeakMap

Module es6.weak-map.

new WeakMap(iterable (entries) ?) -> weakmap
  #delete(key) -> bool
  #get(key) -> val
  #has(key) -> bool
  #set(key, val) -> @

Example:

var a = [1]
  , b = [2]
  , c = [3];

var wmap = new WeakMap([[a, 1], [b, 2]]);
wmap.set(c, 3).set(b, 4);
log(wmap.has(a));   // => true
log(wmap.has([1])); // => false
log(wmap.get(a));   // => 1
wmap.delete(a);
log(wmap.get(a));   // => undefined

// Private properties store:
var Person = (function(){
  var names = new WeakMap;
  function Person(name){
    names.set(this, name);
  }
  Person.prototype.getName = function(){
    return names.get(this);
  };
  return Person;
})();

var person = new Person('Vasya');
log(person.getName());          // => 'Vasya'
for(var key in person)log(key); // => only 'getName'

WeakSet

Module es6.weak-set.

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

Example:

var a = [1]
  , b = [2]
  , c = [3];

var wset = new WeakSet([a, b, a]);
wset.add(c).add(b).add(c);
log(wset.has(b));   // => true
log(wset.has([2])); // => false
wset.delete(b);
log(wset.has(b));   // => false

Caveats when using collections polyfill:

Frozen objects as collection keys are supported, but not recomended - it's slow (O(n) instead of O(1)) and, for weak-collections, leak.
Weak-collections polyfill stores values as hidden properties of keys. It works correct and not leak in most cases. However, it is desirable to store a collection longer than its keys.

ECMAScript 6: Iterators

Modules es6.string.iterator and es6.array.iterator:

String
  #@@iterator() -> iterator
Array
  #values() -> iterator
  #keys() -> iterator
  #entries() -> iterator (entries)
  #@@iterator() -> iterator
Arguments
  #@@iterator() -> iterator (sham, available only in core-js methods)

Modules es6.map and es6.set:

Map
  #values() -> iterator
  #keys() -> iterator
  #entries() -> iterator (entries)
  #@@iterator() -> iterator (entries)
Set
  #values() -> iterator
  #keys() -> iterator
  #entries() -> iterator (entries)
  #@@iterator() -> iterator

Module web.dom.iterable:

NodeList
  #@@iterator() -> iterator

Example:

var string = 'a𠮷b';

for(var val of string)log(val);         // => 'a', '𠮷', 'b'

var array = ['a', 'b', 'c'];

for(var val of array)log(val);          // => 'a', 'b', 'c'
for(var val of array.values())log(val); // => 'a', 'b', 'c'
for(var key of array.keys())log(key);   // => 0, 1, 2
for(var [key, val] of array.entries()){
  log(key);                             // => 0, 1, 2
  log(val);                             // => 'a', 'b', 'c'
}

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

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

var set = new Set([1, 2, 3, 2, 1]);

for(var val of set)log(val);            // => 1, 2, 3
for(var val of set.values())log(val);   // => 1, 2, 3
for(var key of set.keys())log(key);     // => 1, 2, 3
for(var [key, val] of set.entries()){
  log(key);                             // => 1, 2, 3
  log(val);                             // => 1, 2, 3
}

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

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

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

Example:

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

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

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

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

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

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

ECMAScript 6: Promises

Module es6.promise.

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

Basic example:

function sleepRandom(time){
  return new Promise(function(resolve, reject){
    setTimeout(resolve, time * 1e3, 0 | Math.random() * 1e3);
  });
}

log('Run');                    // => Run
sleepRandom(5).then(function(result){
  log(result);                 // => 869, after 5 sec.
  return sleepRandom(10);
}).then(function(result){
  log(result);                 // => 202, after 10 sec.
}).then(function(){
  log('immediately after');    // => immediately after
  throw Error('Irror!');
}).then(function(){
  log('will not be displayed');
}).catch(log);                 // => => Error: Irror!

Promise.resolve and Promise.reject example:

Promise.resolve(42).then(log); // => 42
Promise.reject(42).catch(log); // => 42

Promise.resolve($.getJSON('/data.json')); // => ES6 promise

Promise.all example:

Promise.all([
  'foo',
  sleepRandom(5),
  sleepRandom(15),
  sleepRandom(10)  // after 15 sec:
]).then(log);      // => ['foo', 956, 85, 382]

Promise.race example:

function timeLimit(promise, time){
  return Promise.race([promise, new Promise(function(resolve, reject){
    setTimeout(reject, time * 1e3, Error('Await > ' + time + ' sec'));
  })]);
}

timeLimit(sleepRandom(5), 10).then(log);   // => 853, after 5 sec.
timeLimit(sleepRandom(15), 10).catch(log); // Error: Await > 10 sec

ECMAScript 7 async functions example:

var delay = time => new Promise(resolve => setTimeout(resolve, time))

async function sleepRandom(time){
  await delay(time * 1e3);
  return 0 | Math.random() * 1e3;
};
async function sleepError(time, msg){
  await delay(time * 1e3);
  throw Error(msg);
};

(async () => {
  try {
    log('Run');                // => Run
    log(await sleepRandom(5)); // => 936, after 5 sec.
    var [a, b, c] = await Promise.all([
      sleepRandom(5),
      sleepRandom(15),
      sleepRandom(10)
    ]);
    log(a, b, c);              // => 210 445 71, after 15 sec.
    await sleepError(5, 'Irror!');
    log('Will not be displayed');
  } catch(e){
    log(e);                    // => Error: 'Irror!', after 5 sec.
  }
})();

core-js Promise supports (but not adds to native implementations) unhandled rejection tracking. In browser you will see notify in console, in node.js / io.js you can use unhandledRejection event.

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
  .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, sham(ie11+)

Example:

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

Array#includes proposal - module es7.array.includes
String#at proposal - module es7.string.at
String#padLeft, String#padRight proposal - modules es7.string.pad-left, es7.string.pad-right
String#trimLeft, String#trimRight proposal - modules es7.string.trim-left, es7.string.trim-right
Object.values, Object.entries tc39 discuss - modules es7.object.values, es7.object.entries
Object.getOwnPropertyDescriptors proposal - module es7.object.get-own-property-descriptors
RegExp.escape proposal - module es7.regexp.escape
Map#toJSON, Set#toJSON proposal - modules es7.map.to-json, es7.set.to-json

Array
  #includes(var, from?) -> bool
String
  #at(index) -> string
  #padLeft(length, fillStr = ' ') -> string
  #padRight(length, fillStr = ' ') -> string
  #trimLeft() -> string
  #trimRight() -> string
Object
  .values(object) -> array
  .entries(object) -> array
  .getOwnPropertyDescriptors(object) -> object
RegExp
  .escape(str) -> str
Map
  #toJSON() -> array
Set
  #toJSON() -> array

Examples:

[1, 2, 3].includes(2);        // => true
[1, 2, 3].includes(4);        // => false
[1, 2, 3].includes(2, 2);     // => false

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

'a𠮷b'.at(1);        // => '𠮷'
'a𠮷b'.at(1).length; // => 2

'hello'.padLeft(10);          // => '     hello'
'hello'.padLeft(10, '1234');  // => '41234hello'
'hello'.padRight(10);         // => 'hello     '
'hello'.padRight(10, '1234'); // => 'hello12341'

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]]

// Shallow object cloning with prototype and descriptors:
var copy = Object.create(Object.getPrototypeOf(O), Object.getOwnPropertyDescriptors(O));
// Mixin:
Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));

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

JSON.stringify(new Map([['a', 'b'], ['c', 'd']])); // => '[["a","b"],["c","d"]]'
JSON.stringify(new Set([1, 2, 3, 2, 1]));          // => '[1,2,3]'

Mozilla JavaScript: Array generics

Module js.array.statics.

Array
  .{...ArrayPrototype methods}

Array.slice(arguments, 1);

Array.join('abcdef', '+'); // => 'a+b+c+d+e+f'

var form = document.getElementsByClassName('form__input');
Array.reduce(form, function(memo, it){
  memo[it.name] = it.value;
  return memo;
}, {}); // => {name: 'Vasya', age: '42', sex: 'yes, please'}

setTimeout / setInterval

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

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

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

setImmediate

Module web.immediate. setImmediate polyfill.

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

Example:

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

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

Console

Module core.log. Console cap for old browsers and some additional functionality. In IE, Node.js / IO.js and Firebug console methods not require call from console object, but in Chromium and V8 this throws error. For some reason, we can't replace console methods by their bound versions. Add log object with bound console methods. Some more sugar: log is shortcut for log.log, we can disable output.

log ==== log.log
  .{...console API}
  .enable() -> void
  .disable() -> void

// Before:
if(window.console && console.warn)console.warn(42);
// After:
log.warn(42);

// Before:
setTimeout(console.warn.bind(console, 42), 1000);
[1, 2, 3].forEach(console.warn, console);
// After:
setTimeout(log.warn, 1000, 42);
[1, 2, 3].forEach(log.warn);

// log is shortcut for log.log
setImmediate(log, 42); // => 42

log.disable();
log.warn('Console is disabled, you will not see this message.');
log.enable();
log.warn('Console is enabled again.');

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

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);
log(vector.xy);  // => 15
log(vector.xyz); // => 25
vector.y++;
log(vector.xy);  // => 15.811388300841896
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

Dict create object without prototype from iterable or simple object. Example:

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))log(key); // => 'a', 'b', 'c'

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

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

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

new Map((for([k, v] of Dict.entries(dict))if(v % 2)[k + k, v * v])); // =>  Map {aa: 1, cc: 9}

Basic dict operations for objects with prototype example:

'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 equialents 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)

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

Modules core.number.iterator.

Number
  #@@iterator() -> iterator

Examples:

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

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

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

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]

// Comprehensions:
[for(i of 10)if(i % 2)i * i]; // => [1, 9, 25, 49, 81]

Dict((for(i of 3)['key' + i, !(i % 2)])); // => {key0: true, key1: false, key2: true}

Escaping HTML

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

String
  #escapeHTML() -> str
  #unescapeHTML() -> str

Examples:

'<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. Example:

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

(async () => {
  await delay(3e3);
  log('after 3 sec');
  
  while(await delay(3e3))log('each 3 sec');
})();

Missing polyfills

ES5 JSON is missing now only in IE7- and never it will be added to core-js, if you need it in these old browsers available many implementations, for example, json3.
ES6 Typed Arrays can be polyfilled without serious problems, but it will be slow - getter / setter for each element and they are missing completely only in IE9-. You can use this polyfill. Possible, it will be added to core-js in the future, completely or only missing methods of existing arrays.
ES6 String#normalize is not very usefull feature, but this polyfill will be very large. If you need it, you can use unorm.
ES6 Proxy can't be polyfilled, but for Node.js / Chromium with additional flags you can try harmony-reflect for adapt old style Proxy API to final ES6 version.
ES7 Object.observe can be polyfilled with many limitations, but it will be very slow - dirty checking on each tick. In nearest future it will not be added to core-js - it will cause serious slowdown in applications which uses Object.observe and fallback if it's missing. Possible it will be added as optional feature then most actual browsers will have this feature. Now you can use this polyfill.
ES7 SIMD. core-js doesn't adds polyfill of this feature because of large size and some other reasons. You can use this polyfill.
window.fetch is not crossplatform feature, in some environments it make no sense. For this reason I don't think it should be in core-js. Looking at the large number of requests it maybe added in the future. Now you can use, for example, this polyfill.

Changelog

1.1.0 - 2015.08.17

updated string padding to actual proposal - renamed, minor internal changes:
- String#lpad -> String#padLeft
- String#rpad -> String#padRight
added string trim functions - proposal, defacto standard - required only for IE11- and fixed for some old engines:
- String#trimLeft
- String#trimRight
String#trim fixed for some engines by es6 spec and moved from es5 to single es6 module
splitted es6.object.statics-accept-primitives
caps for freeze-family Object methods moved from es5 to es6 namespace and joined with es6 wrappers
es5 namespace also includes modules, moved to es6 namespace - you can use it as before
increased MessageChannel priority in $.task, #95
does not get global.Symbol on each getting iterator, if you wanna use alternative Symbol shim - add it before core-js
Reflect.construct optimized and fixed for some cases
simplified Reflect.enumerate, see this question
some corrections in Math.acosh
fixed Math.imul for old WebKit
some fixes in string / RegExp well-known symbols logic
some other fixes and optimizations

1.0.1 - 2015.07.31

some fixes for final MS Edge, replaced broken native Reflect.defineProperty
some minor fixes and optimizations
changed compression client/*.min.js options for safe Function#name and Function#length, should be fixed #92

1.0.0 - 2015.07.22

added logic for well-known symbols:
- Symbol.match
- Symbol.replace
- Symbol.split
- Symbol.search
actualized and optimized work with iterables:
- optimized Map, Set, WeakMap, WeakSet constructors, Promise.all, Promise.race for default Array Iterator
- optimized Array.from for default Array Iterator
- added core.getIteratorMethod helper
uses enumerable properties in shimmed instances - collections, iterators, etc for optimize performance
added support native constructors to Reflect.construct with 2 arguments
added support native constructors to Function#bind shim with new
removed obsolete .clear methods native Weak-collections
maximum modularity, reduced minimal custom build size, separated into submodules:
- es6.reflect
- es6.regexp
- es6.math
- es6.number
- es7.object.to-array
- core.object
- core.string
- core.iter-helpers
- internal modules ($, $.iter, etc)
many other optimizations
final cleaning non-standard features
- moved $for to separate library. This work for syntax - for-of loop and comprehensions
- moved Date#{format, formatUTC} to separate library. Standard way for this - ECMA-402
- removed Math methods from Number.prototype. Slight sugar for simple Math methods calling
- removed {Array#, Array, Dict}.turn
- removed core.global
uses ToNumber instead of ToLength in Number Iterator, Array.from(2.5) will be [0, 1, 2] instead of [0, 1]
fixed #85 - invalid Promise unhandled rejection message in nested setTimeout
fixed #86 - support FF extensions
fixed #89 - behavior Number constructor in strange case

0.9.18 - 2015.06.17

removed / from RegExp.escape escaped characters

0.9.17 - 2015.06.14

updated RegExp.escape to the latest proposal
fixed conflict with webpack dev server + IE buggy behavior

0.9.16 - 2015.06.11

more correct order resolving thenable in Promise polyfill
uses polyfill instead of buggy V8 Promise

0.9.15 - 2015.06.09

collections from library version return wrapped native instances
fixed collections prototype methods in library version
optimized Math.hypot

0.9.14 - 2015.06.04

updated Promise.resolve behavior
added fallback for IE11 buggy Object.getOwnPropertyNames + iframe
some other fixes

0.9.13 - 2015.05.25

added fallback for Symbol polyfill for old Android
some other fixes

0.9.12 - 2015.05.24

different instances core-js should use / recognize the same symbols
some fixes

0.9.11 - 2015.05.18

simplified custom build
- add custom build js api
- added grunt-cli to devDependencies for npm run grunt
some fixes

0.9.10 - 2015.05.16

wrapped Function#toString for correct work wrapped methods / constructors with methods similar to the lodash isNative
added proto versions of methods to export object in default version for consistency with library version

0.9.9 - 2015.05.14

wrapped Object#propertyIsEnumerable for Symbol polyfill
added proto versions of methods to library for ES7 bind syntax
some other fixes

0.9.8 - 2015.05.12

fixed Math.hypot with negative arguments
added Object#toString.toString as fallback for lodash isNative

0.9.7 - 2015.05.07

added support DOM collections to IE8- Array#slice

0.9.6 - 2015.05.01

added String#lpad, String#rpad

0.9.5 - 2015.04.30

added cap for Function#@@hasInstance
some fixes and optimizations

0.9.4 - 2015.04.27

fixed RegExp constructor

0.9.3 - 2015.04.26

some fixes and optimizations

0.9.2 - 2015.04.25

more correct Promise unhandled rejection tracking and resolving / rejection priority

0.9.1 - 2015.04.25

fixed __proto__-based Promise subclassing in some environments

0.9.0 - 2015.04.24

added correct symbols descriptors
- fixed behavior Object.{assign, create, defineProperty, defineProperties, getOwnPropertyDescriptor, getOwnPropertyDescriptors} with symbols
- added single entry points for Object.{create, defineProperty, defineProperties}
added Map#toJSON
removed non-standard methods Object#[_] and Function#only - they solves syntax problems, but now in compilers available arrows and ~~in near future will be available~~ available bind syntax
removed non-standard undocumented methods Symbol.{pure, set}
some fixes and internal changes

0.8.4 - 2015.04.18

uses webpack instead of browserify for browser builds - more compression-friendly result

0.8.3 - 2015.04.14

fixed Array statics with single entry points

0.8.2 - 2015.04.13

Math.fround now also works in IE9-
added Set#toJSON
some optimizations and fixes

0.8.1 - 2015.04.03

fixed Symbol.keyFor

0.8.0 - 2015.04.02

changed CommonJS API
splitted and renamed some modules
added support ES3 environment (ES5 polyfill) to all default versions - size increases slightly (+ ~4kb w/o gzip), many issues disappear, if you don't need it - simply include only required namespaces / features / modules
removed abstract references support - proposal has been superseded =\
$for.isIterable -> core.isIterable, $for.getIterator -> core.getIterator, temporary available in old namespace
fixed iterators support in v8 Promise.all and Promise.race
many other fixes

0.7.2 - 2015.03.09

some fixes

0.7.1 - 2015.03.07

some fixes

0.7.0 - 2015.03.06

rewritten and splitted into CommonJS modules

0.6.1 - 2015.02.24

fixed support Object.defineProperty with accessors on DOM elements on IE8

0.6.0 - 2015.02.23

added support safe closing iteration - calling iterator.return on abort iteration, if it exists
added basic support Promise unhandled rejection tracking in shim
added Object.getOwnPropertyDescriptors
removed console cap - creates too many problems - you can use core.log module as that
restructuring namespaces
some fixes

0.5.4 - 2015.02.15

some fixes

0.5.3 - 2015.02.14

added support binary and octal literals to Number constructor
added Date#toISOString

0.5.2 - 2015.02.10

some fixes

0.5.1 - 2015.02.09

some fixes

0.5.0 - 2015.02.08

systematization of modules
splitted es6 module
splitted console module: web.console - only cap for missing methods, core.log - bound methods & additional features
added delay method
some fixes

0.4.10 - 2015.01.28

Object.getOwnPropertySymbols polyfill returns array of wrapped keys

0.4.9 - 2015.01.27

FF20-24 fix

0.4.8 - 2015.01.25

some collections fixes

0.4.7 - 2015.01.25

added support frozen objects as collections keys

0.4.6 - 2015.01.21

added Object.getOwnPropertySymbols
added NodeList.prototype[@@iterator]
added basic @@species logic - getter in native constructors
removed Function#by
some fixes

0.4.5 - 2015.01.16

some fixes

0.4.4 - 2015.01.11

enabled CSP support

0.4.3 - 2015.01.10

added Function instances name property for IE9+

0.4.2 - 2015.01.10

Object static methods accept primitives
RegExp constructor can alter flags (IE9+)
added Array.prototype[Symbol.unscopables]

0.4.1 - 2015.01.05

some fixes

0.4.0 - 2015.01.03

added es6.reflect module:
- added Reflect.apply
- added Reflect.construct
- added Reflect.defineProperty
- added Reflect.deleteProperty
- added Reflect.enumerate
- added Reflect.get
- added Reflect.getOwnPropertyDescriptor
- added Reflect.getPrototypeOf
- added Reflect.has
- added Reflect.isExtensible
- added Reflect.preventExtensions
- added Reflect.set
- added Reflect.setPrototypeOf
core-js methods now can use external Symbol.iterator polyfill
some fixes

0.3.3 - 2014.12.28

console cap excluded from node.js default builds

0.3.2 - 2014.12.25

added cap for ES5 freeze-family methods
fixed console bug

0.3.1 - 2014.12.23

some fixes

0.3.0 - 2014.12.23

Optimize Map & Set:
- use entries chain on hash table
- fast & correct iteration
- iterators moved to es6 and es6.collections modules

0.2.5 - 2014.12.20

console no longer shortcut for console.log (compatibility problems)
some fixes

0.2.4 - 2014.12.17

better compliance of ES6
added Math.fround (IE10+)
some fixes

0.2.3 - 2014.12.15

Symbols:
- added option to disable addition setter to Object.prototype for Symbol polyfill:
  - added Symbol.useSimple
  - added Symbol.useSetter
- added cap for well-known Symbols:
  - added Symbol.hasInstance
  - added Symbol.isConcatSpreadable
  - added Symbol.match
  - added Symbol.replace
  - added Symbol.search
  - added Symbol.species
  - added Symbol.split
  - added Symbol.toPrimitive
  - added Symbol.unscopables

0.2.2 - 2014.12.13

added RegExp#flags (December 2014 Draft Rev 29)
added String.raw

0.2.1 - 2014.12.12

repair converting -0 to +0 in native collections

0.2.0 - 2014.12.06

added es7.proposals and es7.abstract-refs modules
added String#at
added real String Iterator, older versions used Array Iterator
added abstract references support:
- added Symbol.referenceGet
- added Symbol.referenceSet
- added Symbol.referenceDelete
- added Function#@@referenceGet
- added Map#@@referenceGet
- added Map#@@referenceSet
- added Map#@@referenceDelete
- added WeakMap#@@referenceGet
- added WeakMap#@@referenceSet
- added WeakMap#@@referenceDelete
- added Dict.{...methods}[@@referenceGet]
removed deprecated .contains methods
some fixes

0.1.5 - 2014.12.01

0.1.4 - 2014.11.27

added Dict.mapPairs

0.1.3 - 2014.11.20

TC39 November meeting:
- .contains -> .includes
  - String#contains -> String#includes
  - Array#contains -> Array#includes
  - Dict.contains -> Dict.includes
- removed WeakMap#clear
- removed WeakSet#clear

0.1.2 - 2014.11.19

Map & Set bug fix

0.1.1 - 2014.11.18

public release

Name		Name	Last commit message	Last commit date
Latest commit History 827 Commits
build		build
client		client
core		core
es5		es5
es6		es6
es7		es7
fn		fn
js		js
library		library
modules		modules
tests		tests
web		web
.eslintrc		.eslintrc
.gitattributes		.gitattributes
.gitignore		.gitignore
.npmignore		.npmignore
.travis.yml		.travis.yml
Gruntfile.js		Gruntfile.js
LICENSE		LICENSE
README.md		README.md
bower.json		bower.json
index.js		index.js
package.json		package.json
shim.js		shim.js

Uh oh!

License

zloirock/core-js

Folders and files

Latest commit

History

Repository files navigation

core-js

Usage

Basic

CommonJS

Custom build

API:

ECMAScript 5

ECMAScript 6

ECMAScript 6: Object & Function

ECMAScript 6: Array

ECMAScript 6: String & RegExp

ECMAScript 6: Number & Math

ECMAScript 6: Symbols

Caveats when using Symbol polyfill:

ECMAScript 6: Collections

Map

Set

WeakMap

WeakSet

Caveats when using collections polyfill:

ECMAScript 6: Iterators

ECMAScript 6: Promises

ECMAScript 6: Reflect

ECMAScript 7

Mozilla JavaScript: Array generics

setTimeout / setInterval

setImmediate

Console

Object

Dict

Partial application

Number Iterator

Escaping HTML

delay

Missing polyfills

Changelog

1.1.0 - 2015.08.17

1.0.1 - 2015.07.31

1.0.0 - 2015.07.22

0.9.18 - 2015.06.17

0.9.17 - 2015.06.14

0.9.16 - 2015.06.11

0.9.15 - 2015.06.09

0.9.14 - 2015.06.04

0.9.13 - 2015.05.25

0.9.12 - 2015.05.24

0.9.11 - 2015.05.18

0.9.10 - 2015.05.16

0.9.9 - 2015.05.14

0.9.8 - 2015.05.12

0.9.7 - 2015.05.07

0.9.6 - 2015.05.01

0.9.5 - 2015.04.30

0.9.4 - 2015.04.27

0.9.3 - 2015.04.26

0.9.2 - 2015.04.25

0.9.1 - 2015.04.25

0.9.0 - 2015.04.24

0.8.4 - 2015.04.18

0.8.3 - 2015.04.14

0.8.2 - 2015.04.13

0.8.1 - 2015.04.03

0.8.0 - 2015.04.02

0.7.2 - 2015.03.09

0.7.1 - 2015.03.07

0.7.0 - 2015.03.06

0.6.1 - 2015.02.24

0.6.0 - 2015.02.23

0.5.4 - 2015.02.15

0.5.3 - 2015.02.14

0.5.2 - 2015.02.10

0.5.1 - 2015.02.09

0.5.0 - 2015.02.08

Caveats when using `Symbol` polyfill:

Packages