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, extended partial application, console cap, date formatting. You can require only standardized features polyfills, use features without global namespace pollution or create a custom build.
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
- API
- ECMAScript 5
- ECMAScript 6
- ECMAScript 6: Symbols
- ECMAScript 6: Collections
- ECMAScript 6: Iterators
- ECMAScript 6: Promises
- ECMAScript 6: Reflect
- ECMAScript 7
- Mozilla JavaScript: Array generics
- setTimeout / setInterval
- setImmediate
- console
- Object
- Dict
- Partial application
- Date formatting
- Array
- Number
- Escaping characters
- delay
- Changelog
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.
Caveat: 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 possible conflicts.
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');
Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3]
// 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');
from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3]
Available entry points for methods / constructors, as above, excluding features from es5
module (this module requires fully 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.
Available inclusion by module name, for example, es6.array.prototype
- core-js/modules/es6.array.prototype
or core-js/library/modules/es6.array.prototype
.
npm i -g grunt-cli
npm i core-js
cd node_modules/core-js && npm i
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
.
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
.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-
.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)
String
#trim() -> str
Date
.now() -> int
#toISOString() -> string
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
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'
Module es6.object.statics-accept-primitives
. In ES6 most Object
static methods should work with primitives. Example:
Object.keys('qwe'); // => ['0', '1', '2']
Object.getPrototypeOf('qwe') === String.prototype; // => true
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)
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]
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.regexp
.
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
[new] RegExp(pattern, flags?) -> regexp, ES6 fix: can alter flags (IE9+)
#flags -> str (IE9+)
'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'
'๐ ฎท'.codePointAt(0); // => 134071
String.fromCodePoint(97, 134071, 98); // => 'a๐ ฎทb'
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'
Module es6.number.constructor
. Number
constructor support binary and octal literals, example:
Number('0b1010101'); // => 85
Number('0o7654321'); // => 2054353
Modules es6.number.statics
and es6.math
.
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
.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
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
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)]
- We can't add new primitive type,
Symbol
returns object. - By default, to hide the keys,
Symbol
polyfill defines setter inObject.prototype
. For this reason, thein
operator is not working correctly withSymbol
polyfill:Symbol() in {} // => true
.
You can disable defining setter 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
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).
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
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]]
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
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']
Module es6.weak-map
.
new WeakMap(iterable (entries) ?) -> weakmap
#delete(key) -> bool
#get(key) -> val
#has(key) -> bool
#set(key, val) -> @
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'
Module es6.weak-set
.
new WeakSet(iterable?) -> weakset
#add(key) -> @
#delete(key) -> bool
#has(key) -> bool
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
- 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.
- Unlike the
default
orshim
versionscore-js
,library
version does not repair broken native methods of collections prototypes.
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
var string = 'a๐ ฎทb';
for(var val of string)log(val); // => 'a', '๐ ฎท', '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);
}
Module core.iter-helpers
- helpers for check iterable / get iterator in library
version or, for example, for arguments
object:
core
.isIterable(var) -> bool
.getIterator(iterable) -> iterator
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
Module core.$for
- iterators chaining - for-of
and array / generator comprehensions helpers for ES5- syntax.
$for(iterable, entries) -> iterator ($for)
#of(fn(value, key?), that) -> void
#array(mapFn(value, key?)?, that) -> array
#filter(fn(value, key?), that) -> iterator ($for)
#map(fn(value, key?), that) -> iterator ($for)
$for(new Set([1, 2, 3, 2, 1])).of(function(it){
log(it); // => 1, 2, 3
});
$for([1, 2, 3].entries(), true).of(function(key, value){
log(key); // => 0, 1, 2
log(value); // => 1, 2, 3
});
$for('abc').of(console.log, console); // => 'a', 'b', 'c'
$for([1, 2, 3, 4, 5]).of(function(it){
log(it); // => 1, 2, 3
if(it == 3)return false;
});
var ar1 = $for([1, 2, 3]).array(function(v){
return v * v;
}); // => [1, 4, 9]
var set = new Set([1, 2, 3, 2, 1]);
var ar1 = $for(set).filter(function(v){
return v % 2;
}).array(function(v){
return v * v;
}); // => [1, 9]
var iter = $for(set).filter(function(v){
return v % 2;
}).map(function(v){
return v * v;
});
iter.next(); // => {value: 1, done: false}
iter.next(); // => {value: 9, done: false}
iter.next(); // => {value: undefined, done: true}
var map1 = new Map([['a', 1], ['b', 2], ['c', 3]]);
var map2 = new Map($for(map1, true).filter(function(k, v){
return v % 2;
}).map(function(k, v){
return [k + k, v * v];
})); // => Map {aa: 1, cc: 9}
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.
}
})();
Module es6.reflect
.
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+)
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
Array#includes
proposal - modulees7.array.includes
String#at
proposal - modulees7.string.at
String#lpad
,String#rpad
proposal - moduleses7.string.lpad
,es7.string.rpad
Object.values
,Object.entries
tc39 discuss - modulees7.object.to-array
Object.getOwnPropertyDescriptors
proposal - modulees7.object.get-own-property-descriptors
RegExp.escape
proposal - modulees7.regexp.escape
Map#toJSON
,Set#toJSON
proposal - moduleses7.map.to-json
,es7.set.to-json
Array
#includes(var, from?) -> bool
String
#at(index) -> string
#lpad(length, fillStr = ' ') -> string
#rpad(length, fillStr = ' ') -> string
Object
.values(object) -> array
.entries(object) -> array
.getOwnPropertyDescriptors(object) -> object
RegExp
.escape(str) -> str
Map
#toJSON() -> array
Set
#toJSON() -> array
[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
'a๐ ฎทb'.at(1); // => '๐ ฎท'
'a๐ ฎทb'.at(1).length; // => 2
'hello'.lpad(10); // => ' hello'
'hello'.lpad(10, '1234'); // => '41234hello'
'hello'.rpad(10); // => 'hello '
'hello'.rpad(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]'
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'}
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);
Module web.immediate
. setImmediate polyfill.
setImmediate(fn(...args), ...args) -> id
clearImmediate(id) -> void
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');
}));
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.');
Module core.object
.
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
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
.turn(object, fn(memo, val, key, @), memo = new @) -> memo
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'
Dict.turn(dict, function(memo, it, key){
memo[key + key] = it;
}); // => {aa: 1, bb: 2, cc: 3}
Dict.turn(dict, function(memo, it, key){
it % 2 && memo.push(key + it);
}, []); // => ['a1', 'c3']
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
Module core.date
. Much more simple and compact (~60 lines with en
& ru
locales) than Intl or Moment.js. Use them if you need extended work with Date
.
Date
#format(str, key?) -> str
#formatUTC(str, key?) -> str
core
.addLocale(key, object) -> core
.locale(key?) -> key
Token | Unit | Sample |
---|---|---|
s | Seconds | 0-59 |
ss | Seconds, 2 digits | 00-59 |
m | Minutes | 0-59 |
mm | Minutes, 2 digits | 00-59 |
h | Hours | 0-23 |
hh | Hours, 2 digits | 00-23 |
D | Date | 1-31 |
DD | Date, 2 digits | 01-31 |
W | Weekday, string | ะัะพัะฝะธะบ |
N | Month | 1-12 |
NN | Month, 2 digits | 01-12 |
M | Month, string | ะะพัะฑัั |
MM | Of month, string | ะะพัะฑัั |
Y | Year, full | 2014 |
YY | Year, 2 digits | 14 |
Examples: |
new Date().format('W, MM D, YY, h:mm:ss'); // => 'Friday, November 28, 14, 18:47:05'
new Date().formatUTC('W, MM D, YY, h:mm:ss'); // => 'Friday, November 28, 14, 12:47:05'
new Date().format('W, D MM Y ะณ., h:mm:ss', 'ru'); // => 'ะััะฝะธัะฐ, 28 ะะพัะฑัั 2014 ะณ., 18:07:25'
core.locale('ru');
new Date().format('W, D MM Y ะณ., h:mm:ss'); // => 'ะััะฝะธัะฐ, 28 ะะพัะฑัั 2014 ะณ., 18:07:25'
new Date().format('DD.NN.YY'); // => '28.11.14'
new Date().format('hh:mm:ss'); // => '18:47:05'
new Date().format('DD.NN.Y hh:mm:ss'); // => '28.11.2014 18:47:05'
new Date().format('W, D MM Y ะณะพะดะฐ'); // => 'ะััะฝะธัะฐ, 28 ะะพัะฑัั 2014 ะณะพะดะฐ'
new Date().format('D MM, h:mm'); // => '28 ะะพัะฑัั, 16:47'
new Date().format('M Y'); // => 'ะะพัะฑัั 2014'
(typeof core != 'undefined' ? core : require('core-js/library')).addLocale('ru', {
weekdays: 'ะะพัะบัะตัะตะฝัะต,ะะพะฝะตะดะตะปัะฝะธะบ,ะัะพัะฝะธะบ,ะกัะตะดะฐ,ะงะตัะฒะตัะณ,ะััะฝะธัะฐ,ะกัะฑะฑะพัะฐ',
months: 'ะฏะฝะฒะฐั:ั|ั,ะคะตะฒัะฐะป:ั|ั,ะะฐัั:ะฐ|,ะะฟัะตะป:ั|ั,ะะฐ:ั|ะน,ะัะฝ:ั|ั,ะัะป:ั|ั,ะะฒะณััั:ะฐ|,ะกะตะฝััะฑั:ั|ั,ะะบััะฑั:ั|ั,ะะพัะฑั:ั|ั,ะะตะบะฐะฑั:ั|ั'
});
Module core.array.turn
.
Array
#turn(fn(memo, val, index, @), memo = []) -> memo
Method Array#turn
reduce array to object, example:
[1, 2, 3, 4, 5].turn(function(memo, it){
memo['key' + it] = !!(it % 2);
}, {}); // => {key1: true, key2: false, key3: true, key4: false, key5: true}
[1, 2, 3, 4, 5, 6, 7, 8, 9].turn(function(memo, it){
it % 2 && memo.push(it * it);
if(memo.length == 3)return false;
}); // => [1, 9, 25]
Modules core.number.iterator
and core.number.math
.
Number
#@@iterator() -> iterator
#random(lim = 0) -> num
#{...Math}
Number 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}
Math
methods in Number.prototype
examples:
3..pow(3); // => 27
(-729).abs().sqrt(); // => 27
10..random(20); // => Random number (10, 20), for example, 16.818793776910752
10..random(20).floor(); // => Random integer [10, 19], for example, 16
var array = [1, 2, 3, 4, 5];
array[array.length.random().floor()]; // => Random element, for example, 4
Module core.string.escape-html
.
String
#escapeHTML() -> str
#unescapeHTML() -> str
'<script>doSomething();</script>'.escapeHTML(); // => '<script>doSomething();</script>'
'<script>doSomething();</script>'.unescapeHTML(); // => '<script>doSomething();</script>'
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');
})();
- added support DOM collections to IE8-
Array#slice
- added
String#lpad
,String#rpad
- added cap for
Function#@@hasInstance
- some fixes and optimizations
- fixed
RegExp
constructor
- some fixes and optimizations
- more correct
Promise
unhandled rejection tracking and resolving / rejection priority
- fixed
__proto__
-basedPromise
subclassing in some environments
- added correct symbols descriptors
- fixed behavior
Object.{assign, create, defineProperty, defineProperties, getOwnPropertyDescriptor, getOwnPropertyDescriptors}
with symbols - added single entry points for
Object.{create, defineProperty, defineProperties}
- fixed behavior
- added
Map#toJSON
- removed non-standard methods
Object#[_]
andFunction#only
- they solves syntax problems, but now in compilers available arrows, in near future will be available bind syntax - removed non-standard undocumented methods
Symbol.{pure, set}
- some fixes and internal changes
- uses
webpack
instead ofbrowserify
for browser builds - more compression-friendly result
- fixed
Array
statics with single entry points
Math.fround
now also works in IE9-- added
Set#toJSON
- some optimizations and fixes
- fixed
Symbol.keyFor
- 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
andPromise.race
- many other fixes
- some fixes
- some fixes
- rewritten and splitted into CommonJS modules
- fixed support
Object.defineProperty
with accessors on DOM elements on IE8
- 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 usecore.log
module as that - restructuring namespaces
- some fixes
- some fixes
- added support binary and octal literals to
Number
constructor - added
Date#toISOString
- some fixes
- some fixes
- 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
Object.getOwnPropertySymbols
polyfill returns array of wrapped keys
- FF20-24 fix
- some collections fixes
- added support frozen objects as collections keys
- added
Object.getOwnPropertySymbols
- added
NodeList.prototype[@@iterator]
- added basic
@@species
logic - getter in native constructors - removed
Function#by
- some fixes
- some fixes
- enabled CSP support
- added
Function
instancesname
property for IE9+
Object
static methods accept primitivesRegExp
constructor can alter flags (IE9+)- added
Array.prototype[Symbol.unscopables]
- some fixes
- 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
- added
core-js
methods now can use externalSymbol.iterator
polyfill- some fixes
- console cap excluded from node.js default builds
- added cap for ES5 freeze-family methods
- fixed
console
bug
- some fixes
- Optimize
Map
&Set
:- use entries chain on hash table
- fast & correct iteration
- iterators moved to
es6
andes6.collections
modules
console
no longer shortcut forconsole.log
(compatibility problems)- some fixes
- better compliance of ES6
- added
Math.fround
(IE10+) - some fixes
- Symbols:
- added option to disable addition setter to
Object.prototype
for Symbol polyfill:- added
Symbol.useSimple
- added
Symbol.useSetter
- added
- 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
- added
- added option to disable addition setter to
- added
RegExp#flags
(December 2014 Draft Rev 29) - added
String.raw
- repair converting -0 to +0 in native collections
- added
es7.proposals
andes7.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]
- added
- removed deprecated
.contains
methods - some fixes
- added
Array#copyWithin
- added
String#codePointAt
- added
String.fromCodePoint
- added
Dict.mapPairs
- TC39 November meeting:
.contains
->.includes
String#contains
->String#includes
Array#contains
->Array#includes
Dict.contains
->Dict.includes
- removed
WeakMap#clear
- removed
WeakSet#clear
Map
&Set
bug fix
- public release