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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.
Maybe you are not using the backtick for your string or the string is not exactly the same as the example in the instructions.
@Notare The Big O Notation is an evaluation of the execution time (and space) of an algorithm in different scenario where the amount of data provided change.
O(1) stands for algorithm where the execution time is the same no matter the amount of data provided.
That's because of the notion of scope of your variable, in other words his availability for the other parts of your code.