elizabethengelman · December 26, 2015 01:39
diff --git a/zoo.html b/zoo.html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <!--  This loads the zoo.js script so that the Zoo constructor and zoo instance are available in the console.  -->
    <script src="zoo.js"></script>
    <title>Zoo</title>
  </head>
  <body>
    This is a really cool zoo.
  </body>
 </html>
diff --git a/zoo.js b/zoo.js
 //------------------------------------------------------------------------------------------------------------------
 // YOUR CODE: Create your Zoo "object literal" and Animal "constructor" and "prototypes" here.
 //------------------------------------------------------------------------------------------------------------------
 var Zoo = {}; //Zoo Object literal

 Zoo.init = function(animals) { //creating 
    console.log("You just made a zoo!");
    this.animals = animals;
  };

 Zoo.bipeds = function() {
  var animal_array = this.animals;
  var bipeds = new Array();

  for (var i=0; i<animal_array.length; i++)
  {
    if (animal_array[i].number_of_legs == 2)
    {
      bipeds.push(animal_array[i]);
    }
  }
  console.log(bipeds[0], bipeds[1], bipeds[2]);
  return bipeds;
 };

 Zoo.quadrupeds = function() {
  var animal_array = this.animals;
  var quadrupeds = new Array();

  for (var i=0; i<animal_array.length; i++)
  {
    if (animal_array[i].number_of_legs == 4)
    {
      quadrupeds.push(animal_array[i]);
    }
  }
  console.log(quadrupeds[0], quadrupeds[1]);
  return quadrupeds;
 };


 function Animal(name, number_of_legs) {
  this.name = name;
  this.number_of_legs = number_of_legs;
  console.log(name, number_of_legs);
  
 }

 Animal.prototype.identify = function(){
  console.log("I am a " + this.name + " with " + this.number_of_legs + " legs.")
  return "I am a " + this.name + " with " + this.number_of_legs + " legs."
 }

 //------------------------------------------------------------------------------------------------------------------
 // DRIVER CODE: Do **NOT** change anything below this point. Your task is to implement code above to make this work.
 //------------------------------------------------------------------------------------------------------------------

 function assert(test, message) {
  if (!test) {
    throw "ERROR: " + message;
  }
  return true;
 }

 var animals = [
  new Animal("Human", 2),
  new Animal("Monkey", 2),
  new Animal("Kangaroo", 2),
  new Animal("Horse", 4),
  new Animal("Cow", 4),
  new Animal("Centipede", 100)
 ];

 Zoo.init(animals);

 assert(
  Zoo.bipeds().length === 3, "the Zoo should have 3 bipeds"
 );
 assert(
  Zoo.quadrupeds().length === 2, "the Zoo should have 2 bipeds"
 );
 assert(
  animals[0].identify() === "I am a Human with 2 legs.", "humans have 2 legs"
 );
 assert(
  animals[2].name === "Kangaroo", "expected 'Kangaroo'"
 );
 assert(
  animals[0].identify === animals[5].identify, "only one implementation of the identify() function should exist"
 );

 animals[5].identify
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<!-- This loads the zoo.js script so that the Zoo constructor and zoo instance are available in the console. -->
	<script src="zoo.js"></script>
	<title>Zoo</title>
	</head>
	<body>
	This is a really cool zoo.
	</body>
	</html>
	//------------------------------------------------------------------------------------------------------------------
	// YOUR CODE: Create your Zoo "object literal" and Animal "constructor" and "prototypes" here.
	//------------------------------------------------------------------------------------------------------------------
	var Zoo = {}; //Zoo Object literal

	Zoo.init = function(animals) { //creating
	console.log("You just made a zoo!");
	this.animals = animals;
	};

	Zoo.bipeds = function() {
	var animal_array = this.animals;
	var bipeds = new Array();

	for (var i=0; i<animal_array.length; i++)
	{
	if (animal_array[i].number_of_legs == 2)
	{
	bipeds.push(animal_array[i]);
	}
	}
	console.log(bipeds[0], bipeds[1], bipeds[2]);
	return bipeds;
	};

	Zoo.quadrupeds = function() {
	var animal_array = this.animals;
	var quadrupeds = new Array();

	for (var i=0; i<animal_array.length; i++)
	{
	if (animal_array[i].number_of_legs == 4)
	{
	quadrupeds.push(animal_array[i]);
	}
	}
	console.log(quadrupeds[0], quadrupeds[1]);
	return quadrupeds;
	};


	function Animal(name, number_of_legs) {
	this.name = name;
	this.number_of_legs = number_of_legs;
	console.log(name, number_of_legs);

	}

	Animal.prototype.identify = function(){
	console.log("I am a " + this.name + " with " + this.number_of_legs + " legs.")
	return "I am a " + this.name + " with " + this.number_of_legs + " legs."
	}

	//------------------------------------------------------------------------------------------------------------------
	// DRIVER CODE: Do NOT change anything below this point. Your task is to implement code above to make this work.
	//------------------------------------------------------------------------------------------------------------------

	function assert(test, message) {
	if (!test) {
	throw "ERROR: " + message;
	}
	return true;
	}

	var animals = [
	new Animal("Human", 2),
	new Animal("Monkey", 2),
	new Animal("Kangaroo", 2),
	new Animal("Horse", 4),
	new Animal("Cow", 4),
	new Animal("Centipede", 100)
	];

	Zoo.init(animals);

	assert(
	Zoo.bipeds().length === 3, "the Zoo should have 3 bipeds"
	);
	assert(
	Zoo.quadrupeds().length === 2, "the Zoo should have 2 bipeds"
	);
	assert(
	animals[0].identify() === "I am a Human with 2 legs.", "humans have 2 legs"
	);
	assert(
	animals[2].name === "Kangaroo", "expected 'Kangaroo'"
	);
	assert(
	animals[0].identify === animals[5].identify, "only one implementation of the identify() function should exist"
	);

	animals[5].identify