Flash cards
Review the key moves
1/3
Core idea
What is the main idea behind JavaScript Versions?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Order
Put the learning moves in the order that makes the concept easiest to apply.
The current JavaScript version is ES2025 .
ECMAScript Editions
Current JavaScript Version
Current JavaScript Version
The current JavaScript version is ES2025 .
ECMAScript is the official name of the JavaScript standard .
JavaScript was invented by Brendan Eich in 1995 and became an ECMA standard in 1997.
The first ECMAScript versions were abbreviated by numbers. (ES1, ES2, ES3, ES5, ES6).
From 2016, versions are named by year (ECMAScript 2016, 2017, 2018, ..., 2025).
ECMAScript Editions
| Official Name | Most Important Features | |
|---|---|---|
| ECMAScript 1 (1997) | FIRST EDITION | |
| ECMAScript 2 (1998) | ONLY EDITORIAL CHANGES | |
| ECMAScript 3 (1999) See Details Regular expressions Error handling (try...catch) The switch keyword The do...while loop | ||
| ECMAScript 4 | WAS NEVER RELEASED | |
| ECMAScript 5 (2009) See Details | The "use strict" Directive JSON support The String trim() method The Date.now() method String property access [ ] Many new Array methods Many new Object methods | |
| ECMAScript 6 (2015) See Details | The let and const keywords Default parameter values Rest parameter Destructuring assignment The spread operator Sets and Maps Classes Promises Modules For...in Loop Many new Array methods Many new String methods Many new Math methods | |
| ECMAScript 2016 See Details | The ** Exponentiation Operator The Array includes() method | |
| ECMAScript 2017 See Details | The String padStart() method The String padEnd() method The Object values() method The Object entries() method The Object getAllPropertyDescriptors() method The async and await keywords | |
| ECMAScript 2018 See Details | Asynchronus iteration Promise finally Array rest elements Object rest properties Shared memory new Regexp features (/s, \p{}, ?<=y, ?<name>) | |
| ECMAScript 2019 See Details | String trimStart() String trimEnd() Object fromEntries() Optional catch binding Array flat() Array flatMap() Revised Array sort() Revised JSON stringify() Revised Function toString() Separator symbols in srings | |
| ECMAScript 2020 See Details | BigInt String matchAll() Promise allSettled() Dynamic import globalThis import.meta Namespace exports New Operators (??, ?. &&=, | =, ??=) |
| ECMAScript 2021 See Details | Promise any() String replaceAll() Numeric separator | |
| ECMAScript 2022 See Details | Array at() String at() RegExp /d Object hasOwn() error cause await import Class fields Private methods and fields | |
| ECMAScript 2023 See Details | #! Array findLast() Array findlastIndex() Array toReversed() Array toSorted() Array toSpliced() Array with() Array findLast() | |
| ECMAScript 2024 See Details | Map groupBy() Object groupBy() String isWellFormed() String toWellFormed() Promise withResolvers() Atomics waitAsync | |
| ECMAScript 2025 See Details | RegExp /v flag RegExp escape() Float16Array Math f16round() Promise try() Import Attributes 7 new Set methods | |
| ECMAScript 2026 See Details | Error isError() Array fromAsync() The using keyword The await using Uin8Array.toBase64() Uin8Array.fromBase64() Uin8Array.toHex() Uin8Array.fromHex() |