Functions and Constructors

11-example.js

var MyClass = function () {
  console.log(this);
};

new MyClass(); // Constructor
MyClass();     // Function

21-example.js

var MyClass = function () {
};

var myOne = new MyClass(),
myTwo = MyClass();

console.log(myOne);
console.log(myTwo);

22-example.js

var MyClass = function () {
  return this;
};

var myOne = new MyClass(),
myTwo = MyClass();

console.log(myOne);
console.log(myTwo);

31-example.js

var MyClass = function (value) {
  this.myValue = value;
};

MyClass.prototype.getValue = function () {
  return this.myValue;
};
 
var myOne = new MyClass('text for one'),
    myTwo = MyClass('text for two');

console.log(myOne.getValue());
console.log(myTwo.getValue());