An extensive, yet concise quick-reference guide and overview of JavaScript fundamentals.

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• Updated Mar 8, 2024

The complete MDN JavaScript Guide and Reference as nine print-ready A4 PDF books (unofficial, CC-BY-SA)

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• Updated Nov 11, 2026
• Python

Searchable React notes for JavaScript fundamentals, scope, closures, hoisting, execution context, and the event loop.

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• Updated Nov 12, 2026
• JavaScript