Object Descriptors & Property Flags

What does this code demonstrate about property accessors?

const user = {};

Object.defineProperty(user, 'fullName', {
  get() {
    return this._firstName + ' ' + this._lastName;
  },
  set(value) {
    [this._firstName, this._lastName] = value.split(' ');
  },
  enumerable: true,
  configurable: true
});

user.fullName = 'John Doe';
console.log(user._firstName);

Property accessors are always private
Accessors can control how values are processed when getting/setting
This code demonstrates that property accessors (getters/setters) can control how values are processed: 1) The setter parses the full name into first and last names, 2) It stores these components in separate internal properties (_firstName, _lastName), 3) The getter reconstructs the full name from these components, 4) This provides a clean interface while maintaining internal data structure, 5) Accessors enable computed properties that transform or validate data on access, 6) They can maintain internal state that's updated when the property is modified, 7) This pattern is powerful for creating properties that have derived or processed values.
Getters and setters work only with Object.defineProperty
Accessors always require writable: true

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