- 454 名前：デフォルトの名無しさん mailto:sage [2019/02/28(木) 22:33:12.22 ID:lyW2+AsV.net]
- >>410 ruby
https://ideone.com/lGQ1lX
f = -> s {[''].product(*s.chars.map {|c| [c, c.upcase]}).map(&:join)}
p %W(#{} a ab).map {|s| [s, f.(s)]}
↓
[["", [""]], ["a", ["a", "A"]], ["ab", ["ab", "aB", "Ab", "AB"]]]
