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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.
'Looks like you've solved it'
use
this.valueOf()which provides the actual string which to use. I've spend hours looking for in documentation only to stumble onto it accidentally in my IDE.The method you're trying to use is not available in the Node version currently supported by CW.
That's because you have to extend the String.prototype not create a function like you normally do in other katas.
please mention your language