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Enums provide a way to define named constants in TypeScript, making your code more readable and maintainable. Whether you're working with status codes, user roles, or application states, enums help organize related values under a single type. This guide covers numeric enums, string enums, const enums, and most importantly—when to use enums versus alternatives like union types and objects. Learn the patterns that will make your TypeScript code cleaner and more expressive.

Arrays and tuples are essential for working with collections in TypeScript. While arrays hold multiple values of the same type, tuples allow you to work with fixed-length arrays where each position has a specific type. This guide covers array types, readonly patterns, tuple best practices, and practical examples that you'll use in real applications. Learn how to leverage TypeScript's type system for safer, more maintainable collection handling.

TypeScript's type system starts with fundamental building blocks: primitive types like string, number, and boolean, along with arrays and type annotations. Understanding these basic types is essential for writing type-safe code. This comprehensive guide walks you through each primitive type, shows you how to use type annotations effectively, and teaches you best practices for working with arrays and basic data structures in TypeScript.