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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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Very Good solution!!!
Agree this is a bug in the description IMO.
My original choice of treating everything as uppercase lead me to a much more complex than necessary implementation that still failed on the randomized tests...
Personally, I had the basic idea right away... stacking partially applied functions and using something like id as the initial value, but I couldn't get the form right and resorted to looking it up in the wiki. I guess I cheated, but I plan to come back to this one in the future and see if I can get it without peeking.
now I feel silly...
This sentance really was confusing: "If x length is less than or equal to 1 return 0: the car didn't move."
I ended up passing all the tests including random tests with rule:
"If the average speed for a given interval is less than 1, count the average speed is as if it where 0 for that interval."