Thank you very much for explanation.

What? How? I am sure that this is clever solution, but definitelly not readable as book.

Will this remove trailing spaces on line without markers?

Ruby 2.5 appeared on Codewars relatively recently, while the kata is old.

Oh, I learn something new .digits! Thanks.

Wau! Clever usage of returning value. And nicely uncomplicated Regexp.

sum_array(arr) => use just arr.sum

It's not smart and I wrote this during my "solve every problem as fast as possible without using a brain cell" streak, don't bump this in production.

Exactly like mine solution, not oneliner, but nicely readable!

It looks like smart solution, I guess, but I would like to not bump into this in production. Not so readable.

In this approach I would just store min lenght in variable, and overwrite it if some lower occurs. Instead building array of lenghts and sort it.