Example of a constructor function in JavaScript

constructor.js

//define a function
var BaristaFunction = function(name){
    this.myName = name;
};

//define a method
BaristaFunction.prototype.sayHi = function(){
    alert('Hi I\'m ' + this.myName);
};

//*** here's the interesting part ***
//create an object from the Barista using a constructor
var baristaObject = new BaristaFunction('Jose');

//test out our method
baristaObject.sayHi();    //alerts 'Hi I'm Jose'