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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.
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The conversion should only be done when there is a single value.
And spaces can only be ignored at both ends.
All cases pass except for the following. From my understanding these should indeed return the number, rather than NaN. (because new lines and spaces are OK). Am I missing something???
[ '1', ' ', '1' ]
Value is not what was expected
[ '1', ' ', '2', ' ', '3' ]