Generics

Summary

Reusable, type-safe components and functions that work with a variety of types instead of a single one, using type parameters like `<T>`.

• 1Write a generic `identity<T>(value: T): T` function and call it with different types.
• 2Build a generic `useLocalStorage<T>` hook if you're pairing this with React.
• 3Learn generic constraints (`<T extends SomeType>`) to restrict what's allowed.