object-reference.js

// assigning object to x 
x = { 
  name: 'John', 
  age: 20 
}; 

y = x; 

x.name = 'John Doe'; 

console.log(y.name); // prints "John Doe" 

y === x // true

// assigning new object changes reference 
x = { 
  name: 'John', 
  age: 20 
}; 

y === x // false, since x's reference has changed