ES-Intro

Cheatsheet of new ECMAScript features and syntax.

ES6/ES2015

const and let

variables.js

Template Literals

strings.js

Rest Parameters and Spread Operator

spread-rest.js

Default Function Parameters

default.js

for...of

for.js

Arrow Functions

arrows.js

Destructing

destructuring.js

Classes

class.js

Promise, Set & Map

objects.js

Some new methods

methods.js

Modules (export & import)

modules.js

ES7/ES2016

Includes

includes.js

Exponentiation

exponentiation.js

ES8/ES2017

async & await

async-await.js

String padding

pad.js

Object.values() & Object.entries()

object-values-entries.js

ES9/ES2018

Spread & Rest for object properties

spread-rest-properties.js

Promise finally

promise-finally.js

Regex improvements

regex.js

ES10/ES2019

flat & flatMap

flat.js

fromEntries

fromEntries.js

Optional catch binding

optional-catch-binding.js

trimStart & trimEnd

trim-start-end.js

ES11/ES2020

Promise.allSettled

allSettled.js

BigInt

bigInt.js

Dynamic import

dynamic-import.js

matchAll

matchAll.js

Nullish coalescing

nullish-coalescing.js

Optional chaining

optional-chaining.js

ES12/ES2021

Numeric separators

numeric-separators.js

replaceAll

replaceAll.js

Promise.any

promise-any.js

Logical assignment

logical-assignment.js

WeakRef

WeakRef.js

ES13/ES2022

Top-Level await

top-level-await.mjs

.at()

at.js

Error cause

error-cause.js

Object.hasOwn

has-own.js

RegExp indices /d flag

regexp-d-flag

New class elements

new-class-elements.js

in operator for private fields and methods

private-field-in.js

ES14/ES2023

Array find from last

array-find-from-last.js

Change array by copy

array-by-copy.js

Hashbang

hashbang.js

Symbols as keys in weak collections

symbol-in-weak.js

ES15/ES2024

Array Grouping

array-grouping.js

Promise.withResolvers

promise-withResolvers.js

Well formed strings

well-formed.js

Atomics waitAsync

atomics-waitAsync.js

RegExp unicodeSets

regexp-unicodesets.js

ArrayBuffer resize and transfer

arraybuffer.js

ES16/ES2025

Duplicate named capturing groups

duplicate-named-capturing-groups.js

Float16Array

float16array.js

Import Attributes & JSON modules

import-attributes-and-json-import.mjs

Iterator helpers

iterator-helpers.js

Regular Expression Escaping

regular-expression-escaping.js

Regular Expression Pattern Modifiers

regular-expression-pattern-modifiers.js

Set methods

set-mothods.js

Presentation

New Things in JavaScript

Presentation in folder demo-6-8, and hosted at es-intro.netlify.app/.

Beyond ES6 - New Things in JavaScript

Presentation in folder demo-7-11, and hosted at beyond-es6.netlify.app/.

Releases

https://github.com/tc39/ecma262/releases