Created
January 6, 2015 11:21
-
-
Save csdear/08b181c590dba231bb79 to your computer and use it in GitHub Desktop.
Knight and Warlord Javascript Object Summary Play : create prototype base class object, then use object.create to create a regular instance, then creeate a instance that overrides function/properties of prototype object, then use the call/apply/bind functions for correct scoping.
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
// the prototype object | |
function Hero(type) { | |
//properties of this proto object | |
this.strength = 0; | |
this.type = type || "No type"; | |
} | |
// proto function, used by all | |
Hero.prototype.attack = function(newStrength) { | |
this.strength = newStrength; | |
} | |
this.func = function () { | |
return this.type; | |
} | |
} | |
//new object instance | |
var knight = new Hero("Knight"); | |
console.log(knight.strength); // outputs 0 | |
console.log(knight.type); // outputs "Knight" | |
knight.attack(25); | |
//strength is now set to 25. | |
console.log((knight.strength); //outputs 25 | |
// MONO instance, warlord is stronger | |
var warlord = new Hero("Warlord"); | |
warlord.attack = function(newStrength) { | |
this.strength = newStrength + 10; | |
} | |
console.log(knight.strength); | |
console.log(warlord.strength); | |
//making attack a function -- usually this would cause trouble with the this keyword and correct contexting, but this is alleviated by the call, apply bind functions | |
var attackFunc = knight.func; | |
console.log(func.call(knight)); | |
console.log(func.apply(knight)); | |
// or the bind way | |
var func = knight.func.bind(bmw); | |
console.log(func()); | |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment