My God. Who are you, alien?

But your solutions, guys are much more shorter than mine :)

Aaaaand yeah! Machine::new(...).go()
Hope tomorrow I will clean it out.

Guest was actully me. Lost my session. Insidious codewars.

Man, if only you leave some comments and give variables some relevant names I would build a memorial in your honor.

Can it pass the test such as solution(["a","b","c"],3,"a")? I think it should return a

Does this qualify as "easily?"

signmod = index < 0 ? 1 : 0

(index.abs() < items.length + signmod ) ? items[index] : default_value

@wchargin, I think it's fine to use the ternary ? operator here. Is that what you meant by this isn't very Ruby?

See http://stackoverflow.com/questions/4252936/how-do-i-use-the-conditional-operator-in-ruby

This isn't very Ruby. (1) you should use the builtin fetch, (2) if not, you should use unless statements instead.