What is the purpose of return value using return funtion pls explain?!

Question

Return function

Answer 1

For example, consider this function in JavaScript.

function triple(num) {
var triple_val = num * 3;
}
console.log(triple(4));
//Outputs undefined

Why? Because triple_val was not returned.

Change it to this
function triple(num) {
var triple_val = num * 3;
return triple_val;
}
console.log(triple(4));
//Outputs 12

Hope you understand. The return keyword indicates that a value should be returned when the function is called.