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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.
Yep, readability and maintainability for the win. Regex can be great for performance, but until you minify for production, comments are a must.
This seems so much better/more elegant than the regexp options. Am I missing something? Maybe using !isFinite() would be better though due to the ambituity inherint in naming a function "isNaN" in a language that has a literal NaN keyword.