06_exercises.md

06: Exercises

1. What's the output?

function wazeng(arg){
  arg.foo = function(){ alert("BAR"); };
  return arg;
}

var obj = {};
obj["foo"] = function prettyFunction(){ alert("foo"); };

var test = wazeng(obj);

test.foo();
obj.foo();

1. What's the output?

(function myApp(){
  this.name = "My Test Application";
  this.version = "1.0.0";
  this.env = "development";
})();

function Human(){};

function Zombie(name){
  function init(){ 
    this.name = name;
    
    this.whenHumanDetected = function(){
      alert("brainzzz!!!!");
    };
  }
  
  init();
}

Zombie.prototype.encountered = function(object){
  if (object instanceof Human){
    alert(this.name + " encountered a human!");
    this.whenHumanDetected();
  }
}

var francis = new Human();
var vatrick = new Zombie('vatrick');

vatrick.encountered(francis);

1. What's the output?

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

Human.prototype.talk = function(){
	alert("I'm " + this.name);
}; 

var john = new Human("john"),
		jane = new Human("jane");
    
 john.__proto__.talk();

1. What's the output?

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

Human.prototype.talk = function(){
	alert("I'm " + this.name);
}; 

var john = new Human("john"),
		jane = new Human("jane");
    
 var talk = john.__proto__.constructor.prototype.talk;
 talk.call(jane);

1. What's the output?

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

Zombie.prototype.talk = function(){
  return "brainzzz...";
};

var z = new Zombie('z');

alert(z.contsructor);
alert(z.prototype);

1. What's the output?

function Shape(){}
function Square(){}
function Circle(){}

Circle.prototype = Shape.prototype;
Circle.prototype.sides = 0;

Square.prototype = Shape.prototype;
Square.prototype.sides = 4;

var circle = new Circle();
var x = new circle.constructor();

alert(x.constructor);
alert(x.sides);

1. What's the output?

function foo(){
	var x = arguments.length * 2;
  return x;
}

var object = {x: 1};
var result = foo.call(object, [0, 9, 8, 7, 6]);

alert(result);