19/02/28 22:33:12.22 lyW2+AsV.net
>>410 ruby
URLﾘﾝｸ(ideone.com)
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"]]]
19/02/28 22:33:12.22 lyW2+AsV.net
>>410 ruby
URLﾘﾝｸ(ideone.com)
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"]]]