ECMAScript 5
Full support for the ECMAScript 5 specification. Features include `Function.prototype.bind`, Array methods like `indexOf`, `forEach`, `map` & `filter`, Object methods like `defineProperty`, `create` & `keys`, the `trim` method on Strings and many more.
ECMAScript 2015 (ES6)
Support for the ECMAScript 2015 specification. Features include Promises, Modules, Classes, Template Literals, Arrow Functions, Let and Const, Default Parameters, Generators, Destructuring Assignment, Rest & Spread, Map/Set & WeakMap/WeakSet and many more.
Import maps
Import maps allow control over what URLs get fetched by JavaScript `import` statements and `import()` expressions.
javascript built-in: array: flatmap
javascript built-in: array: map
javascript built-in: iterator: flatmap
javascript built-in: iterator: map
javascript built-in: map
javascript built-in: map: [symbol.iterator]
javascript built-in: map: [symbol.species]
javascript built-in: map: clear
javascript built-in: map: delete
javascript built-in: map: entries
javascript built-in: map: foreach
javascript built-in: map: get
javascript built-in: map: groupby
javascript built-in: map: has
javascript built-in: map: keys
javascript built-in: map: key equality for -0 and 0
javascript built-in: map: `map()` constructor
javascript built-in: map: `map()` constructor: `new map(iterable)`
javascript built-in: map: `map()` constructor: `new map(null)`
javascript built-in: map: set
javascript built-in: map: size
javascript built-in: map: values
javascript built-in: typedarray: map
javascript built-in: weakmap
javascript built-in: weakmap: delete
javascript built-in: weakmap: get
javascript built-in: weakmap: has
javascript built-in: weakmap: set
javascript built-in: weakmap: non-registered symbols as keys
javascript built-in: weakmap: `weakmap()` constructor
javascript built-in: weakmap: `weakmap()` constructor: `new weakmap(iterable)`
javascript built-in: weakmap: `weakmap()` constructor: `new weakmap(null)`
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