Question

I want to start my for loop at a certain number, and make it loop. Like this:

5, 6, 7, 8, 9, 10, 0, 1, 2, 3, 4

If the maximum number is 10 and it starts at 5.

The reason is because I want to loop through every tile in my game in a certain order (top to down, then go right).

I have tried the following but it skips one number:

for(var i = position[0]+1; i != position[0]; i++){
    for(var j = position[1]+1; j != position[1]; j++){
        if(j > 11){
            j = 0;
        }
        if(i > 23){
            i = 0;
        }
        if(levelMap[i][j] == type){
            return position;
        }
        trace("j" + j);
    }
    trace(i);
}

Thanks

Answer 1

If you want a sequence like 5, 6, 7, 8, 9, 10, 0, 1, 2, 3, 4 (where the starting point can be any number in that set), you don’t need fancy loop constructs.

You can just use a normal loop with the modulo operator, something like (pseudo-code since one of the tags was language-agnostic):

start = 5
for i = 0 to 10
    use_i = (start + i) % 11
    // do something with use_i rather than i.
next i

This will iterate use_i from 5 to 4, cycling back to 0 after 10.