How to deal with Maybe type in Haskell list comprehensions

Question

I have a list comprehension in Haskell that specifies a predicate on a Maybe type:

[x | x <- listOfMaybes, isJust(f y), x == fromJust(f y)]

is there a way to simplify this expression?

Answer 1

If you simply want to filter out all the Nothings, shang's answer gives the most concise solution. However, it can be done easily in a list comprehension:

[x | Just x <- f y]

Answer 2

You can simply use catMaybes (from Data.Maybe) to filter out all Nothing values.