How to use a return value in another function in Javascript?

Question

I\'m self-teaching myself JavaScript and out of curiosity I\'m wondering what is the proper way of returning a value from one function to be used in another function. For ex

Answer 1

You could call firstFunction from secondFunction :

function secondFunction() {
    alert(firstFunction());
}

Or use a global variable to host the result of firstFunction :

var v = firstFunction();
function secondFunction() { alert(v); }

Or pass the result of firstFunction as a parameter to secondFunction :

function secondFunction(v) { alert(v); }
secondFunction(firstFunction());

Or pass firstFunction as a parameter to secondFunction :

function secondFunction(fn) { alert(fn()); }
secondFunction(firstFunction);

Here is a demo : http://jsfiddle.net/wared/RK6X7/.