super logic

This is very effective, however, it skips the challange.

Please use spoiler flag next time.

how does this work exactly??

Thank you !

For Regex learning: https://www.regular-expressions.info/tutorial.html
For Regex testing/debugging: https://regex101.com/
For Streams: https://www.youtube.com/watch?v=f5j1TaJlc0w - there are more similar tutorials on the YT, if you don't know lambas - learn them first.

Great solution, imo: .mapToObj(Character::toString) is more readable :)

Still learning java, I'm noticing that a lot of problems on codewars are solved in a similar fashion to yours or using regex. I'm not familiar with java.util.stream or regex ... iwould appreciate any study resources you can share that might help me.

from right to left

The logic for reversing the number is duplicated.