JavaScript - Extra strength objects: Using Prototypes(Object digrams)

Head First JavaScript Programming
( O'Reilly Media)
Eric T. Freeman (著), Elisabeth Robson (著)

開発環境

• OS X Mavericks - Apple(OS)
• Safari, Firefox + Firebug, Google Chrome(Webプラウザ、プラグイン)
• BBEdit - Bare Bones Software, Inc. (GUI) , Emacs (CUI) (Text Editor)
• JavaScript (プログラミング言語)

Head First JavaScript Programming (Eric T. Freeman (著)、 Elisabeth Robson (著)、 O'Reilly Media )のChapter 13(Extra strength objects: Using Prototypes)、SHARPEN YOUR PENCIL(p.565)を解いてみる。

SHARPEN YOUR PENCIL(p.565)

PencilSharpener

brand: "Head First" model:2112 inUse: true

sharpen() clean()