text: var person = {
      firstName: 'Dorothy',
      lastName: 'Lu',
      fullName: function() {
          return this.firstName + ' ' + this.lastName;
      }              
  }
  
  var calculator = {
      operand01: -1,
      operand02: -1,
      add: function(){
          return this.operand01 + this.operand01;
      },
      subtract: function(){
          return this.operand01 - this.operand02;
      },
  }
  
  calculator.multiply = function() {
      return calculator.operand01 * calculator.operand02;
  }
  
  calculator.operand01 = person.firstName.length;
  calculator.operand02 = person.lastName.length;
  
  function divider(title) {
      console.log("------------------------------------");
      console.log(title);
      console.log("------------------------------------");
  }
  
  divider('Person');
  console.log('First Name: ', person.firstName);
  console.log('Last Name: ', person.lastName);
  console.log('Full Name: ', person.fullName());
  
  divider('Calculator');
  console.log('Operand 1: ', calculator.operand01);
  console.log('Operand 2: ', calculator.operand02);
  console.log('Add: ', calculator.add());
  console.log('Subtract: ', calculator.subtract());
  console.log('Multiply: ', calculator.multiply());