The JavaScript Handbook (2025 edition)
One of my most popular handbooks is the JavaScript Handbook. Understandably, as JavaScript is such a popular programming language.
I first released this in 2020, 5 years ago.
Today I’m releasing an update.
Not much changed in the language, to be honest. JavaScript is super stable these days.
It’s mostly just cosmetic updates and minor / accuracy fixes, and clarifications, to make this book even better than it already was, and to make it up to date for the next 5 years!
Here’s a brief list of changes:
- Fixed some code examples
- Fixed some grammar and poor wording choices
- Modernized async content
- Type coercion clarification
- Improved how I explain arrays, and objects
- Clarified when you can omit braces in arrow functions (single statement)
- Consolidated default-parameter wording.
- Improved
const/letconsistency:constfor non-reassigned bindings,letonly when reassigned. - Kept semicolon style consistent (no semicolons).
Download it now from https://flaviocopes.com/access/
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