JavaScript inner-functions and Performance

Question

What is the impact on running-time and memory defining a clousre vs. global-scope function?

function a(){
      //functions (option A)
}
//functions(option B         


        

Answer 1

Performance

A very tiny benchmark case:

#1 inner function: http://jsfiddle.net/bMHgc/

#2 function outside: http://jsfiddle.net/sAVZn/

At my machine: (5000 * 1000 times)

#1 - 700ms

#2 - 80ms

Memory

They are almost the same ...

I would recommend option A, if possible, since it can make your code cleaner.