Why does this end up in an infinite loop in Javascript?

Question

I'm making a tower desence game for a game jam in HTML5. I have a subroutine for the AI of the towers. However, for some reason, this function call without a loop ends up in an infinite loop. It only happens when there are at least two towers.

function aiTower(id){
    if(id === 1)alert("towerId = 1 call 1");
    var l = zamerajCiel(id);
    if (l !==  null) towers[id].shoot(l.x,l.y);
    if(id === 1)alert("towerId = 1 call 2");
};

The loop that calls it:

function aiLoop(){
    for(i=0;i<enemies.length;i++){
        aiMon(i);
    }
    for(i=0;i<towers.length;i++){
        aiTower(i);
            if(i === 1)alert("towerId = 1 call 3");
    }
}

The debug msgs are alternating "towerId = 1 call 1" and "towerId = 1 call 2", so the problem probably isn't in the aiLoop(). Also, I have used a regexp to search my code for aiTower(). These were the only two occurences.

I think we will need the code for .shoot and zamerajCiel' as well. Just an advice: use console.log('msg u want to see')`, if you use firebug it will be such a great logging tool. getfirebug.com/logging — p1100i
– p1100i, Commented Nov 10, 2012 at 20:37

Michael Krelin - hacker · Accepted Answer · 2012-11-10 20:37:42Z

2

Make i local to the function by providing var i. It is likely that you modify it elsewhere.

answered Nov 10, 2012 at 20:37

Michael Krelin - hacker

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