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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.
You are not using it right, then, as you probably use it on some intermediate result, so you get the rounding problem when summing it to other stuff.
I think he's referring to the {} after #map.
I'm in Ruby and I'm using #round(2), which should cap it off at 2 decimal places, no?
It does not look much like "properly" rounding, actually...
Despite setting up my rounding parts properly I'm getting some weird outputs on the first test:
Expecting [4.2, -35.8, -2.8, 23.2, 11.2], instead got: [4.200000000000003, -35.8, -2.799999999999997, 23.200000000000003, 11.200000000000003]
Anyone know what's up with that? Every other test passes fine.