set function return type typescript code example

Example 1: typescript default parameter

function sayName({ first, last = 'Smith' }: {first: string; last?: string }): void {
  const name = first + ' ' + last;
  console.log(name);
}

sayName({ first: 'Bob' });

Example 2: function with return type in angular

greet() : number {
    return "Hello, " + this.greeting;
}