You Don’t Know JS Yet is an open-source book series by Kyle Simpson that explores the inner workings of JavaScript. It goes beyond basic usage to explain how the language truly operates, covering scope, closures, prototypes, async, and more.
Core Content
- Scope & Closures: Lexical scope, hoisting, closure patterns.
- this & Object Prototypes: Understanding ‘this’, OLOO vs classical inheritance.
- Types & Grammar: Coercion, equality, abstract operations.
- Async & Performance: Callbacks, promises, generators, Web Workers.
Target Audience
Intermediate to advanced JavaScript developers who want to master the language rather than just use libraries.
How to Use
Read the books online for free at GitHub, or purchase physical copies. Each book includes inline code examples and exercises to solidify concepts.
Notes
Focuses on ES6+ features; assumes familiarity with basic JS. Some later chapters are still in draft.
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