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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <script src="zoo.js"></script> | |
| <title></title> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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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 = { | |
| identify: function() { | |
| return "I am a " + this.name + " with " + this.legs + " legs."; | |
| } | |
| } | |
| var Zoo = { | |
| animals: [], | |
| init: function(array) { | |
| this.animals = array; | |
| }, | |
| bipeds: function(animal) { | |
| // biped: []; | |
| // debugger; | |
| // animal.push(animals[1]); | |
| return this.animals.filter(function(x) { return x.legs === 2; }); | |
| }, | |
| quadrupeds: function(animal) { | |
| return this.animals.filter(function(x) { return x.legs === 4; }); | |
| } | |
| }; | |
| // Zoo.prototype = { | |
| // bipeds: function() { | |
| // return this.legs; | |
| // }, | |
| // quadrupeds: function() { | |
| // return this.type; | |
| // } | |
| // } | |
| //------------------------------------------------------------------------------------------------------------------ | |
| // 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); | |
| console.log(Zoo.animals); | |
| // 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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