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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.
Hi James: I just tried your code myself and it passes to me. What kind of error did you get?
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See my comment above about capitalising the first letter.
A lot of the confusion is coming from not capitialising the first letter. The example should be changed to
"how can mirrors ..."rather than"How can mirrors ..."circleArea("1")should returnfalseas "If the radius is not positive or not a number, return false.", but it returns3.14.