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ECMAScript 2015 (ES6)

Major new features:

'let', 'const'

modules, ie. export/import

destructuring assignment

for...of loops

arrow functions

function default parameters, and rest parameter

generators

Promise

'class'

Symbol

template literal

spread operator ...

typed arrays

Set and WeakSet

Map and WeakMap

iterables and iterators

Proxy and Reflect

Minor new features:

HTML-style comments

Object.assign(), Object.is(), Object.getOwnPropertySymbols(), Object.setPrototypeOf()

'new.target'

Number.isNaN(), Number.isFinite(), Number.isSafeInteger(), Number.EPSILON, Number.MIN_SAFE_INTEGER, Number.MAX_SAFE_INTEGER

str.fromCodePoint(), string.startsWith(), str.endsWith(), str.includes(), str.repeat(), str.normalize(), str.codePointAt()

Array.from(), Array.of(), arr.find(), arr.findIndex(), arr.fill(), arr.keys(), arr.values(), arr.entries(), arr.copyWithin()

Math.sign(), Math.trunc(), Math.cbrt()

RegExp 'y' and 'u' flags

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