JavaScript - Types, Equality, Conversion and All That Jazz: Serious types(concatenation, addition, multiplication, division, subtraction, number, string)

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)、SHARPEN YOUR PENCIL(p.287)を解いてみる。

SHARPEN YOUR PENCIL(p.287)

コード(BBEdit, Emacs)

var output = '';

output += Infinity - '1'; // Infinity - 1, Infinity
output += '\n';
output += '42' + 42;      // '42' + '42, '4242'
output += '\n';
output += 2 + '1 1';      // '2' + '1 1', '21 1'
output += '\n';
output += 99 + 101;       // 200
output += '\n';
output += '1' - '1';      // 1 - 1, 0
output += '\n';
output += 'Result: ' + 10/2;   // 'Result: ' + 5, 'Result: ' + '5', 'Result: 5'
output += '\n';
output += 3 + ' bananas ' + 2 + ' apples'; // '3' + ' bananas ' + '2' + ' apples', '3 bananas 2 apples'

print(output);