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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.
No random tests in JS
Node 18 should be enabled (Refer this and this for more info)
Initial code in Ruby misses function's arguments.
Ruby 3.0 should be enabled.
I am not very happy with the description for Python. You should write a separate one for this as it is very confusing that you call your custom class List while there is the builtin list, which equals your array you want returned.