accessorPropertiesAttributes.js

const user = {
  _firstName: 'Akash',
  _lastName: 'Rajvanshi'
};

Object.defineProperty(user, 'name', {
  get: function() {
      return `I am ${this._firstName} ${this._lastName}`;
  },
  set: function(value) {
      console.log('Setting Name To : %s', value); // When setting another value to _firstName -> "Setting Name To : Abha"
      this._firstName = value;
  },
  enumerable: false,
  configurable: false
});

// Enumerable 
console.log('name' in user) // true
console.log(user.propertyIsEnumerable('name')) // false

// Configurable 
delete user.name
console.log('name' in user) // true

// Getter function
console.log(user.name) // I am Akash Rajvanshi

// Setter function
user.name = 'Abha'
console.log(user.name) // I am Abha Rajvanshi