Question

I have a loop written like so

for( i = (count>=0)?1:-1;(count>=0)?i<=count:i>=count;(count>=0)?i++:i--){
           do_something_with( i )
        }

As you can see I am using the ? operator 3 time in the loop initialization .

Is there any way to simplify this ?
Currently the cpu has to compute a minimum of 2 extra decisions and a max of 3 extra
for each and every iteration. I am trying to reduce this .

Ps : I am trying to avoid using if statements .

Currently I am using javascript as a language

Answer 1

You can do the decision once at the start of the loop, and use the != operator for the comparison:

for (var dir = count >= 0 ? 1 : -1, i = dir; i != count + dir; i += dir){
  do_something_with(i);
}

Demo: http://jsfiddle.net/Guffa/2Z369/