Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
why not? can you explain? I think the numbers of validations inside the when can be worse than accessing the value direct by a key, it is not?
num is non-nullable?
Is result string really sorted?
in this case, I think it’s not very good to store this in the map structure