define return type of function in typescript code example
Example 1: typescript default parameter
sayHello(hello: string = 'hello') {
console.log(hello);
}
sayHello();
sayHello('world');
Example 2: typescript arrow function
let sum = (x: number, y: number): number => {
return x + y;
}
sum(10, 20);
Example 3: get function return type typescript
type return_type = ReturnType<() => string>;
function hello_world(): string {
return "hello world";
}
type return_type = ReturnType<typeof hello_world>;
Example 4: function with return type in angular
greet() : number {
return "Hello, " + this.greeting;
}