What is the best way to do loops in JavaScript

Question

I have stumbled into several methods of looping in JavaScript, what I like the most is:

for(var i = 0; i < a.length; i++){
    var element = a[i];
}
         


        

Answer 1

Small improvement to the original, to only calculate the array size once:

for(var i = 0, len = a.length; i < len; i++){ var element = a[i]; }

Also, I see a lot of for..in loops. Though keep in mind that it's not technically kosher, and will cause problems with Prototype specifically:

for (i in a) { var element = a[i]; }