all -package:text package:io-streams

all predicate stream returns True if every element in stream matches the predicate. all consumes as few elements as possible, ending consumption if any element fails the predicate.

ghci> is <- Streams.fromList [1, 2, 3]
ghci> Streams.all (< 0) is    -- Consumes one element
False
ghci> Streams.read is
Just 2
ghci> Streams.all odd is      -- Only 3 remains
True