typescript generic method if type code example

Example 1: typescript generic function

function firstElement<Type>(arr: Type[]): Type {
  return arr[0];
}
// s is of type 'string'
const s = firstElement(["a", "b", "c"]);
// n is of type 'number'
const n = firstElement([1, 2, 3]);

Example 2: typescript generic type

function identity<T>(arg: T): T {
  return arg;
}Try