JavaScript - Types, Equality, Conversion and All That Jazz: Serious types(typeof, instanceof)

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 7(Types, Equality, Conversion and All That Jazz: Serious types)、IN THA LABORATORY, AGAIN(p.305)を解いてみる。

IN THA LABORATORY, AGAIN(p.305)

コード(BBEdit, Emacs)

var Duck = function (sound) {
        this.sound = sound;
        this.quack = function () {
            print(this.sound);
        };
    },
    toy = new Duck('quack quack');

toy.quack();                // quack quack
print(typeof toy);          // object
print(toy instanceof Duck); // true