Smart Properties

In JS, there are two types of properties: data properties (regular ones) and accessor properties. Accessors are functions that trigger when a value is read or written.

let user = {
  name: "John",
  surname: "Smith",

  get fullName() {
    return `${this.name} ${this.surname}`;
  },

  set fullName(value) {
    [this.name, this.surname] = value.split(" ");
  }
};

Why is this needed?

1. Validation: You can prevent setting a name that is too short in the set method.
2. Compatibility: You can replace a normal property with a getter so old code still works, but the internal logic has changed.