zoo.js

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

function Animal(species, num){
  this.name = species;
  this.peds = num;
};

var Zoo = {
  init: function(array){
    this.blabla = array;
  },
  print: function(){
    console.log(this.blabla);
  },
  val: function(){
    return this.blabla;
  },
  bipeds: function(){
    return this.blabla.filter( function(element){
      return element.peds == 2;
    });
  },
  quadrupeds: function(){
    return this.blabla.filter( function(element){
      return element.peds == 4;
    });
  }
};

Animal.prototype.identify = function(){
  return "I am a " + this.name + " with " + this.peds + " 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);


// console.log(Zoo.bipeds().length);
// console.log(Zoo.quadrupeds().length);
// console.log(animals[0].identify());
// console.log(animals[2].name);
// console.log(animals[0].identify);


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"
);