Execute function N times per threshold

debounceN.js

/*
 * func - function to be called
 * threshold - time period in milliseconds
 * N - how many function calls will be allowed to execute
 */
var debounceN = function(func, threshold, N) {
 
  var counter = 0;
 
  return function f() {    
    if (counter >= N) {
      return;
    }
    
    var obj = this, args = arguments, timeout;
    
    function execute() {
      counter -=1;
      clearTimeout(timeout);
    };
    
    counter += 1;
    timeout = setTimeout(execute, threshold || 100);
    func.apply(obj, args);
  };
};

// Example
// Ensure that only 5 functions could be executed every 10 seconds
var optimizedFunc = debounceN(function() {
  // my complex logic here
}, 1000, 5);