修正・追加 Ruby irb(main):002:0> hoge ||= 'fuga' => "fuga" irb(main):003:0> hoge => "fuga" Javascript 1 > var hoge; undefined > hoge = hoge || 'fuga'; "fuga" > hoge "fuga" 2 > var hoge; undefined > hoge || (hoge = 'fuga'); "fuga" > hoge "f…