Why is iterating through an array backwards faster than forwards

Question

Given this code:

var arr = [];

for (var i = 0; i < 10000; ++i)
    arr.push(1);

Forwards

for (var i =          


        

Answer 1

If you want to have them at same pace, you can do that for forward iteration;

for(var i=0, c=arr.length; i

So, your script won't need to take length of array on everystep.