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| 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."); | |
| }; | |
| var Zoo = { | |
| init: function(animals){ | |
| this.animals = animals; | |
| } | |
| } | |
| Zoo.bipeds = function() { | |
| bipeds = [] | |
| for (i = 0; i < this.animals.length; i++) { | |
| if (this.animals[i].legs === 2) { | |
| bipeds.push(this.animals[i]); | |
| } | |
| } | |
| return bipeds | |
| }; | |
| Zoo.quadrupeds = function() { | |
| quadrupeds = []; | |
| for (i = 0; i < this.animals.length; i++){ | |
| if (this.animals[i].legs === 4){ | |
| quadrupeds.push(this.animals[i]); | |
| } | |
| } | |
| return quadrupeds | |
| }; | |
| 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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