zoo.js

//------------------------------------------------------------------------------------------------------------------
// YOUR CODE: Create your Zoo "object literal" and Animal "constructor" and "prototypes" here.
//------------------------------------------------------------------------------------------------------------------
function Animal(name, legs){
  this.name = name;
  this.legs = legs;
}
 
Animal.prototype.identify = function() {
  return "I am a "+this.name+" with "+this.legs+" legs.";
};
 
function Zoo(animals) {
  this.animals = animals;
}
 
 Zoo = {
    init: function(animals){
        this.animals = animals;
    },
 
    bipeds: function(){
        return this.animals(function(animal){
            return animal.legs === 2;
            var bi = ["H", "M", "K"]
            
        });
        return bi
    },
 
    quadrupeds: function(){
        return this.animals(function(animal){
            return animal.legs === 4;
            var quad = ["horse", "cow"]
        });
        return quad
    }
 };
 
//------------------------------------------------------------------------------------------------------------------
// 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"
);