Leran JavaScripts

JavaScript Object Prototypes

All JavaScript objects inherit properties and methods from a prototype.
Example:

function Person(first, last, age) {
  this.firstName = first;
  this.lastName = last;
  this.age = age;
}

const myFather = new Person("John", "Doe", 28);
const myMother = new Person("Sally", "Rally", 48);
              

To add a new property to a constructor, you must add it to the constructor function:

Person.nationality = "English";
              

function Person(first, last, age) {
  this.firstName = first;
  this.lastName = last;
  this.age = age;
  this.nationality = "English";
}
              

The JavaScript prototype property also allows you to add new methods to objects constructors:
Example::

function Person(first, last, age) {
  this.firstName = first;
  this.lastName = last;
  this.age = age;
}

Person.prototype.name = function() {
  return this.firstName + " " + this.lastName;
};