33 JS Concepts summarizes JavaScript concepts for developers, with examples and reference material.
Open source
24 alternativesModern Js Cheatsheet
The Modern JavaScript Cheatsheet summarizes JavaScript knowledge used in contemporary projects.
About Modern Js Cheatsheet
This GitHub repository is a cheatsheet for JavaScript concepts that developers often encounter in modern projects and contemporary sample code. It explains each topic briefly, usually with a short code sample and a more detailed explanation, and links to external resources for further reading. Most of the concepts come from the ES2015 (ES6) language update.
The guide does not teach JavaScript from the beginning. It is aimed at developers with basic knowledge who find modern codebases hard to follow, for example when learning React. The author marks personal recommendations as such, and some of those tips may be debatable.
Key features
- Side-by-side comparison of var, let, and const scope and reassignability
- Explanations of arrow functions, default parameters, and object and array destructuring
- Examples of map, filter, reduce, and find array methods
- Coverage of Promises, async/await, and error handling
- Notes on modules, template literals, classes, and the extends and super keywords
- Sections on generators, truthy and falsy values, and a glossary of scope and mutation
Best for: Developers with basic JavaScript knowledge who want to understand the modern syntax and concepts used in contemporary projects and frameworks such as React.
Good for
- Each topic includes sample code and a short explanation.
- Lists external resources for further study on many topics.
- Marks personal recommendations as opinions.
Watch out for
- Not intended to teach JavaScript from the ground up.
- Some personal tips may be debatable, according to the author.
Modern Js Cheatsheet at a glance
- Category
- Education & Learning › Learn to Code
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Modern Js Cheatsheet FAQ
Is this guide meant for complete beginners?
No. The guide is intended for developers with basic knowledge who want help with modern codebases. It does not teach JavaScript from the ground up.
Where do the concepts in the cheatsheet come from?
Most of the concepts come from the ES2015 (ES6) JavaScript language update.
Is something wrong or out of date?
Tell us and an editor will check it.
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