Please review and approve Rust translation (https://www.codewars.com/kumite/5f8b41f7272e7a0023bb283f?sel=5f8b41f7272e7a0023bb283f)

Please review and approve Rust translation (https://www.codewars.com/kumite/5eb67e3a9b138200255ffa74?sel=5eb67e3a9b138200255ffa74)

Please review and approve Scala translation (https://www.codewars.com/kumite/5eaebbce9a4f1f002d4ec583?sel=5eaebbce9a4f1f002d4ec583)

Done. New fork for Scala translation
https://www.codewars.com/kumite/5e83773dfc9cc800348a6548?sel=5e83773dfc9cc800348a6548

Please review and approve Scala translation (https://www.codewars.com/kumite/5a715163fd8c06065d00006e?sel=5a715163fd8c06065d00006e)

Not about the kata or solution but ...
"lazy" don't give you any advantages here. Because in the next line the whole expression will be executed completely.
If you want to filter your zipped lists step by step just to the first "right" item you should use "streams" in Scala.

1. https://alvinalexander.com/scala/how-to-use-stream-class-lazy-list-scala-cookbook
2. https://www.scala-lang.org/api/2.12.3/scala/collection/immutable/Stream.html

What parameters should I pass to non-default constructors? Default? Null? Any values?