Question

Just wondering what is the difference in the following 2 methods?

var a = 0;
var b = 0;
var c = 0;

for(var i = 0; i < 6; i++ ){
    a+=i;
    b+=i;
    c+=i;  
}

and

var a = 0;
var b = 0;
var c = 0;

for(var i = 0; i < 6; i++ ){
    a+=i; 
}

for(var i = 0; i < 6; i++ ){
    b+=i;
}

for(var i = 0; i < 6; i++ ){
    c+=i;  
}

*edited thanks locrizak for the correction

Answer 1

The second one is doing 3X the amount of iterations it needs to. In the second one there are 18 iterations through the loops while the first there is only 6 making the script run faster. (In these circumstances you will not notice a difference because you are not doing much in the loops but once you want to do more it will be a performance issue)

Ps. a+i isn;’t doing anything you probably want a+=i