zoo.js

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// 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.bipeds = function(animals){
  bipedals = new Array();
  for (var i=0; i < animals.length; i++){
   if (animal[i][legs] === 2) {
     bipedals.push(i) }
  }
  return bipedals
}

Animal.prototype.quadrupeds = function(animals){
  quad = new Array();
  for (var i=0; i < animals.length; i++){
   if (animal[i][legs] === 4) {
     quad.push(i) }
  }
  return quad
}

Animal.prototype.identify = function(animal) {
  console.log('I am an ' + animal.name + ' with ' + animal.legs + ' legs.')
}



 Zoo = {}
  Zoo.init = function(arg){ zoo = new Animal(arg) }
 Zoo.bipedals = Animal.prototype.bidpeds
 
//------------------------------------------------------------------------------------------------------------------
// 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"
);