zoo.js

//------------------------------------------------------------------------------------------------------------------
// YOUR CODE: Create your Zoo "object literal" and Animal "constructor" and "prototypes" here.
//------------------------------------------------------------------------------------------------------------------

function Animal(animal, legs) {
  this.animal = animal
  this.legs = legs
}

Animal.prototype.identify = function(){
  console.log("I am a " + this.animal +  " with " + this.legs + " legs, " + this.animal +  "s have " + this.legs +  " legs.")
}

Animal.prototype.name = function(){
  console.log(this.animal, " expected " + "'" + this.animal + "'")
}

function Zoo(animals) {
  this.animals = animals
}

Zoo.prototype.bipeds = function() {
 // for each animal object,  count the number of animals with 2 legs
 console.log("the Zoo should have" + this.Animalwithlegs.count +  " bipeds")
}

Zoo.prototype.quadrupeds = function() {
 // for each animal object,  count the number of animals with 2 legs
 console.log("the Zoo should have" +  this.Animalwithlegs.count +  " quadrupeds")
}



//------------------------------------------------------------------------------------------------------------------
// 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"
);