gistfile1.js

  Object.prototype.later = function (time, methodName) {
    
    var args = Array.prototype.slice.apply(arguments, [2])
      , func = this[ methodName ]
      ;
    
    setTimeout(function() {
      
      func.apply(self, args);
      
    }, time);
    
  }
  
  var someObj = {
    sayHi: function(n) {
      var num = n || 5; // If no number is passed in default to 5
      for (var i = 0; i < num; i += 1) {
        console.log("Hiya!");
      }
    }
  };
  
  someObj.later(5000, 'sayHi', 7);