Didn't get this one - not working.

zoo.js

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

Zoo = {
  init: function(animals) {
    Zoo = new Array(animals);
  }
};

function Animal(name, numberOfLegs) {
  this.name = name;
  this.numberOfLegs = numberOfLegs;
};

Animal.prototype.bipeds = function bipeds() {
  if (this.numberOfLegs == 2) {
    return 1
  } else {
    return 0
  }
};

Animal.prototype.quadrupeds = function quadrupeds() {
  if (this.numberOfLegs == 4) {
    return 1
  } else {
    return 0
  }
};

Animal.prototype.name = function name() {
  return this.name
};

animal[0] = function identify() {
  return ("I am Human with "+numberOfLegs+"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);

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"
);