TypeScriptGenerics

TypeScript Generics Deep Dive

From basic <T> to conditional types — see how generics flow through your code.

By Forhad22 min readAdvancedInteractive Demo

What are Generics?

Generics let you write reusable code that works with any type while still preserving type safety. Think of <T> as a type variable — a placeholder that gets filled in when you use the function or class.

Key Patterns

  • Generic functions — function identity<T>(arg: T): T
  • Constraints — <T extends HasLength> restricts what T can be
  • Conditional types — T extends string ? A : B
  • Mapped types — transform every property in a type

Visual Preview

TypeScript Generics Deep Dive

Interactive demo coming soon — check back for the full generics visualizer.