I don not understand why come here to practice and answer just by using built-in methods.

What's the difference with .detect?

Unpublishing as a duplicate of https://www.codewars.com/kata/complete-fibonacci-series

That one's Haskell version asks for fib(1000). JS version only asks for fib(40), but that's still enough to prevent the truly naive implementation.

i made a mistake what i did was list.map(regexp)

Fixed.

Added.

Not an issue.

This is a direct duplicate, see below.

There are direct Fibs kata, see below.

For some reason, doing this did not work when I attempted it... and only worked once I removed the ampersand.

I'm still not certain how closures work in Ruby... hell, I'm not even certain that is the concept I should be looking up.

How is using reduce writing your own reduce ?

Not an issue

Suggestion