Prototype sample code

constructor_scope.js

function Person(name) {
  this.name = name;  
}

Person.prototype.whoAmI = function() {
  console.log(this.name);
}

var alex = new Person('alex');

alex.whoAmI();

alex.name;

test.js

function MyClass() {}

MyClass.prototype.testFunction = function() {
  console.log("I'm from the prototype");
}

var mc = new MyClass()

mc.testFunction()