TypeScript Generics

Sometimes developers write functions that should work with numbers, strings, or arrays, but they still want strict safety. Generics allow you to pass a type into a function as an argument, just like you pass normal data into a function.

1/* this uses a generic type */
2function identity<T>(arg: T): T {
3  return arg;
4}
5
6let output1 = identity<string>("myString");
7let output2 = identity<number>(100);