Question

So I have 2 functions like

var a = function () {

  // returns something or returns nothing  

}

var b = function () {

  //call a() here and return value returned from a() if a() returns something, else continue with execution of b()       

}

I know I can have a variable store returned value and use it but what is the simplest way to do this?

Answer 1

function b() {
    // Return the value returned from a() if it returned something.
    var result = a();
    if (result !== undefined) {
        return result;
    }

    // continue with execution of b.
}

It won’t distinguish the undefined that results from

return;

from the undefined that results from

return undefined;

but if you know a() always returns a value besides undefined when it intentionally returns a value you can rely on !== undefined.