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| //------------------------------------------------------------------------------------------------------------------ | |
| // YOUR CODE: Create your Zoo "object literal" and Animal "constructor" and "prototypes" here. | |
| //------------------------------------------------------------------------------------------------------------------ | |
| //------------------------------------------------------------------------------------------------------------------ | |
| // 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; | |
| } | |
| function Animal(name, legs) { | |
| this.name = name; | |
| this.legs = legs; | |
| } | |
| Animal.prototype = { | |
| identify: function() { | |
| return "I am a "+this.name+" with "+this.legs+" legs."; | |
| }, | |
| name: function() { | |
| return this.name; | |
| } | |
| } | |
| var Zoo = { | |
| animals: [], | |
| init: function(things) { | |
| this.animals.concat(things) | |
| }, | |
| bipeds: function() { | |
| return this.numLegs(2); | |
| }, | |
| quadrupeds: function() { | |
| return this.numLegs(4); | |
| } | |
| numLegs: function(num) { | |
| } | |
| } | |
| 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" | |
| ); |
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