variable names are too long and the test only assert the result to be 58...

Use spoiler flag please.

invalid issue

This is a beginner kata.

This is a beginner kata.

I didn't think there would be, but that's good to know. Cool!

I did some benchmarking, did each 10,000,000 times several times, can't find any differences outside of the margin of error.

Thank you very much for your help. Now, I can apply that new trick to my future problems. Have a nice day. :)

try this: http://ruby-doc.org/core-2.2.0/String.html#method-i-5B-5D

Could somebody tell me where could I the explaination for this one in the Ruby API? Thanks in advance, and have a nice day.

Needs more tests