Javascript run a function inside a loop every x iterations

Question

I have a variable of unknown value, it will be an integer. For this sake, lets say var a = 3;

I have a function that is called continuously:

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Answer 1

Well firstly you will need an incrementing variable counting how many times the function has been called. For instance, start your function with this:

var me = arguments.callee;
me.timesCalled = (me.timesCalled || 0)+1;

Now, you can check that counter. To see that something happens "every X times", simply check to see if the modulus by X is 0:

if( me.timesCalled % a == 0) { /* do something */ }

And there you have it!