Zoo-object_oriented_javascript

gistfile1.txt

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

var Zoo = {}

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

Zoo.bipeds = function() {
  var bipeds = [];
  for(var i = 0; i < this.animals.length; i++) {
    var thisAnimal = this.animals[i];
    if(thisAnimal.isBiped()) {
      bipeds.push(thisAnimal);
    }
  }
  return bipeds;
}

// =======================================

var Zoo = {
  init: function() {
    this.animals = list_of_animals
  },

  bipeds: function() {
    var bipeds = [];
    for(var i = 0; i < this.animals.length; i++) {
      var thisAnimal = this.animals[i];
      if(thisAnimal.isBiped()) {
        bipeds.push(thisAnimal);
      }
    }
    return bipeds;
  }
}



function Animal(species, legs) {
  this.species = species;
  this.legs = legs;
};

Animal.prototype.isBiped = function() {
  return this.legs == 2;
}

// Animal.prototype.bipeds {
//   legs === 2;
// }

// Animal.prototype.quadrupeds {
//   legs === 4;
// }



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