option type
オプション型
Result type
Tagged union
Nullable type
Null object pattern
Exception handling
Pattern matching
/suto3/google.iconoption type
/suto3/Google画像検索.iconoption type
/suto3/Google定義検索.icon option type
/suto3/wikipedia.iconoption type
/suto3/weblio.icon option type
/suto3/kotobank.icon option type
/suto3/jisho.icon option type