typescript what type is a function code example

Example 1: typescript function type

// define your parameter's type inside the parenthesis
// define your return type after the parenthesis

function sayHello(name: string): string  {
  console.log(`Hello, ${name}`!);
}

sayHello('Bob'); // Hello, Bob!

Example 2: typescript function type

interface Date {
  toString(): string;
  setTime(time: number): number;
  // ...
}