JS Practice — Built-in Objects

Generics — identity<T>

📖 Usage Example

function identity<T>(x: T): T { return x }
identity(42)        // → 42
identity('hello')   // → 'hello'

The identity function is the simplest generic — it preserves the type of its input.

Generics: The Identity Function

The simplest generic function is identity — it accepts a value of any type and returns it unchanged.
<T> declares a type parameter that TypeScript infers from the argument.

Challenge: Implement identity<T>(x: T): T.

identity(42)       // → 42
identity('hello') // → 'hello'

💡 Hints (1)

• The simplest generic function — just return what you receive.