call the function every so many calls

every.js

  // call the func every count times
  var every = function(count, func) {
    var self = this,
      counter = 0;
    return function(arg) {
      counter++;
      // console.log('counter is ' + counter);
      if (counter === count) {
        counter = 0;
        //  console.log("reset counter");
        func(arg);
      }
    };
  };