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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.
yes, it is not needed - explicit vs implicit choice.
As i thought :)
No, it's not needed.
But is coercing it into a boolean needed, since javascript accepts truthy and falsy values?
The first coerces it to a boolean and the second reverts it to the proper value.
Why are you using double negation in this one? Double negation implies the boolean itself.