getters.js

const person = {
    _firstName: 'John',
    _lastName: 'Doe',
    get fullName() {
      if (this._firstName && this._lastName){
        return `${this._firstName} ${this._lastName}`;
      } else {
        return 'Missing a first name or a last name.';
      }
    }
  }
   
  // To call the getter method: 
  console.log(person.fullName); // 'John Doe'


  // Example 
  const robot = {
    _model: '1E78V2',
    _energyLevel: 100,
    get energyLevel(){
      if(typeof this._energyLevel === 'number'){
        return 'My current energy level is '+this._energyLevel;
      }else{
        return 'System malfunction: cannot retrieve energy level';
      }
    }
  };
  
  console.log(robot.energyLevel);