text: var arr = []; 
  var laptop = {
  	type: 'macbook',
  	size: '13',
  	year: 'late 2013',  
  	description: function() {
  		console.log('This is a ' + this.size + ' inch ' + this.type + ' laptop '  + 'from ' + this.year);
  	}
  }
  
  for (keys in laptop) {
  	arr.push(keys); 
  };
  
  for (var i = 0; i < arr.length; i++) {
  	console.log(arr[i]); 
  }