fork download 
  1. e = -> n {1 < n ? n.to_s : ''}
  2. f = -> s {s.chars.chunk(&:itself).map {|a, b| a + e.(b.size)}.join}
  3. p %w(あいうえお ああいいうう あいうあいう ううあうう).map {|s| [s, f.(s)]}
  4.  
Success #stdin #stdout 0.01s 6452KB
comments (?)
stdin 
Standard input is empty
stdout 
[["あいうえお", "あいうえお"], ["ああいいうう", "あ2い2う2"], ["あいうあいう", "あいうあいう"], ["ううあうう", "う2あう2"]]
https://ideone.com/GR4Uu2
language:
Ruby (ruby 2.5.5)
created:
4 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!