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Code for Dogs and ShowDogs using class and extends (from Head First JavaScript Programming)
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Prototypes and Classes</title> | |
| <meta charset="utf-8"> | |
| <script src="https://traceur-compiler.googlecode.com/git/bin/traceur.js" | |
| type="text/javascript"></script> | |
| <script src="https://traceur-compiler.googlecode.com/git/src/bootstrap.js" | |
| type="text/javascript"></script> | |
| <script> | |
| traceur.options.experimental = true; | |
| </script> | |
| <script type="module"> | |
| class Dog { | |
| constructor(name, breed, weight) { | |
| this.name = name; | |
| this.breed = breed; | |
| this.weight = weight; | |
| }; | |
| bark() { | |
| console.log(this.name + " says woof woof!"); | |
| }; | |
| run() { | |
| console.log(this.name + " is running"); | |
| }; | |
| wag() { | |
| console.log(this.name + " is wagging"); | |
| }; | |
| toString() { | |
| return "DOG: " + this.name + " weighs " + this.weight + " pounds."; | |
| }; | |
| static describe() { | |
| console.log("All dogs are canines"); | |
| }; | |
| }; | |
| class ShowDog extends Dog { | |
| constructor(name, breed, weight, handler) { | |
| super(name, breed, weight); | |
| this.handler = handler; | |
| }; | |
| // prototype methods | |
| stack() { | |
| console.log(this.name + " is stacking"); | |
| }; | |
| bait() { | |
| console.log(this.name + " is eating a bait"); | |
| }; | |
| gait() { | |
| console.log(this.name + " is gaiting"); | |
| }; | |
| groom() { | |
| console.log(this.name + " is being groomed"); | |
| }; | |
| toString() { | |
| return "SHOW" + super.toString(); | |
| }; | |
| } | |
| var fido = new Dog("Fido", "Mixed", 24); | |
| var scotty = new ShowDog("Scotty", "Scottish Terrier", 15, "Cookie"); | |
| var spot = new ShowDog("Spot", "Poodle", 34, "Beth"); | |
| ShowDog.describe(); | |
| console.log(scotty.toString()); | |
| </script> | |
| </head> | |
| <body> | |
| <h1>Dogs and Show Dogs</h1> | |
| <div id="output"><div> | |
| </body> | |
| </html> |
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