JavaScript Object Constructors 

// using object literal
let person = {
    name: 'Sam' 

} 

// using constructor function
function Person () {
    this.name = 'Sam'
}

let person1 = new Person();
let person2 = new Person();


// Constructor function for Person objects

function Person(first, last, age, eye) {

  this.firstName = first;

  this.lastName = last;

  this.age = age;

  this.eyeColor = eye;

}

// Create a Person object

const person1 = new Person("John", "Doe", 50, "blue");

console.log(person1);

const person2= new Person('A','B',20,'black');

console.log(person2);

// ouput

Person { firstName: 'John', lastName: 'Doe', age: 50, eyeColor: 'blue' }

Person { firstName: 'A', lastName: 'B', age: 20, eyeColor: 'black' }


example


function User(name) {

this.name = name;

this.isAdmin = false;

return;

}

var user = User("Julie");

console.log(user);  // undefined



var obj = {};

function A() { return obj; }

function B() { return obj; }

console.log( new A() == new B() ); // true




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