Is not having local functions a micro optimisation?

Question

Would moving the inner function outside of this one so that its not created everytime the function is called be a micro-optimisation?

In this particular case the

Answer 1

It completely depends on how often the function is called. If it's a OnUpdate function that is called 10 times per second it is a decent optimalisation. If it's called three times per page, it is a micro optimalisation.

Though handy, nested function definitions are never needed (they can be replaced by extra arguments for the function).

Example with nested function:

function somefunc() {
    var localvar = 5

    var otherfunc = function() {
         alert(localvar);
    }

    otherfunc();
}

Same thing, now with argument instead:

function otherfunc(localvar) {
    alert(localvar);
}

function somefunc() {
    var localvar = 5

    otherfunc(localvar);
}