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From filter to partition
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| filter p zs = foldr (select p) [] zs where { select p x xs | p x = x:xs | otherwise = xs } | |
| filter' p zs = foldr (select p) ([],()) zs where { select p x ~(xs,_) | p x = (x:xs, ()) | otherwise = (xs, ()) } | |
| partition p zs = foldr (select p) ([],[]) zs where { select p x ~(xs,ys) | p x = (x:xs, ys) | otherwise = (xs, x:ys) } |
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