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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.
I am having the same 'problem' with Ruby.
A valid empty construction
#<ArgumentError: wrong number of arguments (0 for 1)>
initialize'new' `block (2 levels) inI am not sure if you are trying to RSPEC / test whether a call to the method has any paramaters - not just blank. I've tested my code in REPL.IT and it returns fine with plugboard()