Useful JavaScript Extensions: Number#times

/**
 * Calls iterator the specified number of times, passing in a number of the 
 * current iteration as a parameter. The number will be 0 on first call, 1 on 
 * second call, etc. 
 * 
 * @param {Function} iterator The iterator takes a single parameter, the number 
 * of the current iteration.
 * @param {Object} [context] The optional context parameter specifies an object
 * to treat as <code>this</code> in the iterator block.
 * 
 * @returns The number of times the iterator was called.
 */
Number.prototype.times = function(iterator, context) {
  for(var i = 0; i < this; i++) {
    iterator.call(context, i);
  }
  return i;
}

var n = 3;
 
// Greets you three times, with respect
n.times(function() {
  alert("O HAI!");
});
 
// logs: 0, 1, 2
n.times(function(i) {
  console.log(i);
});