JavaScript - Writing Real Code: Going further(boolean, or operator (||))

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 2(Writing Real Code: Going further)、SHARPEN YOUR PENCIL(p.48)を解いてみる。

SHARPEN YOUR PENCIL(p.48)

コード(BBEdit, Emacs)

var result = '',
    location1 = 3,
    location2 = 4,
    location3 = 5,
    guess,
    hits = 0,
    guesses = 0,
    isSunk = false;

guess = prompt('Ready aim, fire! (enter a number 0-6): ');
if (guess < 0 || guess > 6) {
    result += 'Please enter a valid cell number!\n';
} else {
    guesses += 1;
    guess = parseInt(guess, 10);
    if (guess === location1 || guess === location2 || guess === location3) {
        hits += 1;
    }
}

result += 'guesses: ' + guesses + ', hits: ' + hits;
print(result);