Typescript Cheatsheet Development Tutorials, Guides & Insights

Generics can be used in more complex functions that operate on arrays or other data structures.

function getFirstElement<T>(arr: T[]): T {
  return arr[0];
}

const firstNumber = getFirstElement([1, 2, 3]); // number
const firstString = getFirstElement(['a', 'b', 'c']); // string