Constructor Functions

• describes how an object should be created.
• simler objects
• each created object is known as an instance of that object...

This is an example of a Constructor Function.  

function Monster(rank) {  // the "M" Monster tells other its a constructor Function.
  this.rank = rank;  // explains what the function name or rank is
  this.health = 100;  // starting heath is 100
  this.takeHit = function() { // a method that takes damage to the heath 
    this.health--;
  }
  this.isDead = function() {  // when he dies return the health.
    return this.health <= 0;
  }
}

var monster = new Monster("Captain");  // a new instance of the Constructor

var badGuy = new Monster("bigfoot"); // a new instance of the Constructor

Another:


function Dice(sides) {
  this.sides = sides,
  this.roll = function () {
    var randomNumber = Math.floor(Math.random() * this.sides) + 1;
    return randomNumber;
  }
}