text: // by using 'this' keyword, code becomes more reusable since 
  // you don't need to update every variable that was based on 
  // a certain method. In below case, 'this' can be used
  // to remove any reference
  let dog = {
      name: "Spot",
      numLegs: 4,
      sayLegs: function() {return "This dog has " + this.numLegs + " legs.";}
    };
    
    dog.sayLegs();