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JavaScript language reference

Welcome to the JavaScript Language Reference. This reference provides detailed documentation for JavaScript's built-in types, keywords, functions, and language constructs. Use this as a comprehensive lookup for JavaScript's core language features.

note

This reference is a work in progress. It is not complete and is subject to change.

Built-in Functions​

Reference for all built-in functions available in JavaScript's global namespace. These functions are always available without importing.

Built-in Types​

Complete reference documentation for JavaScript's built-in data types, including their properties, methods, and usage patterns.

Keywords​

JavaScript's reserved keywords that define the language's syntax and control flow. Each keyword has specific rules and usage patterns.

Language Constructs​

Core language constructs and concepts that define how JavaScript code is structured and executed.