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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.
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In bigger projects i would expect such constants. That is much better, than 'magic' 0.5. But if we want just simple function... =)
What i just read? J_J
I've asked my friends, who did same things. I think that just lack of understanding, like "I return 'num' but result of equation is hung in the air... Somewhere".