JavaScript Cheat Sheet Printable, 168 Basics incl. Arrays, Objects, Functions, Promises, Async, DOM, A4 + US Letter

JavaScript Cheat Sheet Printable, 168 Basics incl. Arrays, Objects, Functions, Promises, Async, DOM, A4 + US Letter

A colour-coded quick reference for modern JavaScript (ES2015 onwards): variables and types, operators, strings, numbers, arrays, objects, functions, loops, classes, promises and async/await, errors, JSON and dates, and the most-used DOM calls. The examples were run in Node.js 24 to check they do what the sheet says; the DOM examples need a web browser and were not run.

WHAT'S INSIDE
- 168 entries in 12 colour-coded sections
- A one-page poster of the essentials as the final page
- Two-column layout, clear type, designed to be readable at normal print size
- Variables & types (12 entries)
- Operators (14 entries)
- Strings (17 entries)
- Numbers & Math (14 entries)
- Arrays (26 entries)
- Objects (16 entries)
- Functions (12 entries)
- Control flow (13 entries)
- Classes & modules (9 entries)
- Promises & async (12 entries)
- JSON, dates & storage (10 entries)
- DOM (browser) (13 entries)

HOW TO PRINT
Print at 100% / "Actual size" (not "fit to page"). Use the A4 file for UK/Europe and the US Letter file for the US/Canada. Double-sided printing works well; a hole punch and a folder make a handy desk reference. You can also keep the PDF on screen and use Ctrl+F to search.

FORMAT
- 2 PDF files: A4 and US Letter (instant digital download, nothing is posted)
- Opens in any PDF reader on computer, tablet or phone

PERSONAL-USE LICENCE
For your own personal use (and printing for yourself). Please do not resell, redistribute, share or upload the files. Teachers and trainers: contact the shop for classroom licensing.

NOTES
Designed by the shop; AI tools were used to help create this product. Content is written as a general quick reference - always check the official documentation for your exact version and test commands somewhere safe first. Examples follow modern JavaScript (ES2015+), tested with Node.js 24; some newer methods (Array at, Object.groupBy, structuredClone) need a recent browser or Node. DOM rows were not run in a browser. JavaScript is a trademark of its owner; this sheet is independent. Not affiliated with, endorsed by or sponsored by any company or product named. Names are used only to describe what the sheet covers.