A setter is a method that sets the value of a specific property. It allows you to assign a value to a property using a function, enabling data validation, transformation, or other logic when the property is set.

Syntax

let obj = {
  set propertyName(value) {
    // code to set the property value
  }
};

Example

let person = {
  firstName: 'John',
  lastName: 'Doe',
  set fullName(name) {
    let parts = name.split(' ');
    this.firstName = parts[0];
    this.lastName = parts[1];
  }
};

person.fullName = 'Jane Smith';
console.log(person.firstName); // Output: Jane
console.log(person.lastName);  // Output: Smith

Usage

• Data Validation: Setters can validate the data before setting the property value.
• Data Transformation: Setters can transform the data before setting the property value.
• Encapsulation: Setters can help encapsulate the internal representation of a property.