(defmodule leap (export (leap-year 1))) (defun leap-year ([year] (when (=:= (rem year 400) 0)) 'true) ([year] (when (=:= (rem year 100) 0)) 'false) ([year] (when (=:= (rem year 4) 0)) 'true) ([_] 'false))
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Given a moment, determine the moment that would be after a gigasecond has passed.
Implement the `keep` and `discard` operation on collections. Given a collection and a predicate on the collection's elements, `keep` returns a new collection containing those elements where the predicate is true, while `discard` returns a new collection containing those elements where the predicate is false.
We are going to do the `Transform` step of an Extract-Transform-Load.
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