zoo.js

//------------------------------------------------------------------------------------------------------------------
// YOUR CODE: Create your Zoo "object literal" and Animal "constructor" and "prototypes" here.
//------------------------------------------------------------------------------------------------------------------
var Animal = function(name, legs) {
    this.name = name;
    this.legs = legs;
}

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

var Zoo = {}

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

// Zoo.bipeds = function() {
//     var bipeds = [];
//     $(this.animals).each(function(i, animal) {
//         if animals[i].legs === 2
//         bipeds.push(animals[i]);
//     })
//     return bipeds
// }

// Tried to make this work but kept getting the error Unexpected identifier. I want to go
// back and learn how to use jQuery's .each function properly.

Zoo.bipeds = function() {
    var bipeds = [];
    for (var i = 0; i < this.animals.length; i++) {
        if (animals[i].legs === 2) {
            bipeds.push(animals[i]);
        };
    };
    return bipeds
};

Zoo.quadrupeds = function() {
    var quadrupeds = []
    for (var i = 0; i < this.animals.length; i++) {
        if (animals[i].legs === 4) {
            quadrupeds.push(animals[i]);
        };
    };
    return quadrupeds
}

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