Question

Say you have 2 identical functions that do not return a value

function a() {
    // do some interesting things
}

function b() {
    // do the same interesting things
    return;
}

Function b is obviously more verbose but is there any functional difference between these?

Answer 1

There’s no real difference; both will return undefined.

Functions with no return statement will return undefined, as will functions with an empty return statement.

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To confirm this for yourself, you can run this code — FIDDLE:

​function a() {
}

function b() {
    return;
}

var aResult = a();
var bResult = b();

alert(aResult === bResult);  //alerts true