Last active
August 29, 2015 14:01
-
-
Save dperrymorrow/4d00b937bfc1ea641672 to your computer and use it in GitHub Desktop.
Prototype extension with Javascript
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<html> | |
<head> | |
<meta name="description" content="[add your bin description]" /> | |
<meta charset="utf-8"> | |
<title>JS Bin</title> | |
</head> | |
<body> | |
</body> | |
</html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// function for extending a class | |
function extend (base, constructor) { | |
var proto = function () {}; | |
proto.prototype = base.prototype; | |
constructor.prototype = new proto(); | |
constructor.prototype.constructor = constructor; | |
} | |
// parent class | |
function Animal (name) { | |
this.animalName = name; | |
console.log("////== Animal Constructor ==/////"); | |
console.log("An animal named " + name); | |
} | |
Animal.prototype.makeNoise = function (noise) { | |
console.log("////== Animal makeNoise() ==////"); | |
console.log(noise + ", I can make noise..."); | |
}; | |
// subclass | |
function Dog (name) { | |
// call the super | |
Animal.call(this, name); | |
console.log("////== Dog Constructor ==/////"); | |
console.log("I am a Dog named " + this.animalName); | |
} | |
// important that this happens before you override methods on parent class | |
extend(Animal, Dog); | |
Dog.prototype.makeNoise = function (noise) { | |
Animal.prototype.makeNoise.call(this, noise); | |
console.log("////== Dog makeNoise() ==////"); | |
console.log("I am a Dog, I like to " + noise); | |
}; | |
// Usage | |
var dog = new Dog("Sparky"); | |
dog.makeNoise("Bark!!"); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment