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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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The description does not mean to take the integer portion, it means the absolute value (i.e. if it's negative, treat it like it is positive). The absolute value of -257.8333333333333 is 257.8333333333333, not 257.
.assertSimilar, actually; fixed now, thanks :)
You have to change the assert_equals to assertEquals, as that is the function in JavaScript. It's an error on the kata maker's part.