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$ curl repovive.com/roadmaps/javascript/introduction-to-typescript/generics-introduction

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Generics Introduction

Types that take parameters

Generics create reusable types that work with different types:

function first<T>(arr: T[]): T | undefined {
  return arr[0];
}

const num = first([1, 2, 3]);     // num: number
const str = first(["a", "b"]);   // str: string

The <T> is a type parameter that gets filled in when you call the function.