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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.
He's checking to see if the sqrt() function has decimals by comparing the base sqrt(n) to the rounded down version (floor()) of sqrt(n). If they are equal and the function returns true, then sqrt(n) must have no decimals. Thus, n is a perfect square.