Ok. Thanks for your help. Let's continue to solve another katas )).

Really helped! Thanks!
But I did not understand completely why my version was wrong ).

a[a.index(i)]=(i.reduce(:+))
-and-
r.push((i.reduce(:+)))

gives the same result. I'm confused ))

Please fix up Random tests for Ruby (it can't pass any of the tests). While checking I get one and the same mistake for each test:

<NoMethodError: undefined method `length' for 15:Fixnum

block in kiyo_lcm_test' each'
kiyo_lcm_test' block (3 levels) in '
block (2 levels) in <main>' times'>

Basis tests pass without any problems. I checked the incoming arguments from Random tests using my IDE - everything's fine. Isuppose it's a bug of a final test-case.

What about Ruby? Interesting topic, but not all tasks are adapted :(

You're right! Thx! )

By default, this code not working without " require 'Date' ". Nope?