On Oct 30, 2010, at 2:30 PM, Mark Spezzano wrote:
If you use the type with Maybe Int like so:
sequence [Just 1, Nothing, Just 2]
then the result is Nothing.
Whereas sequence [Just 1, Just 2, Just 3] gives
Just [1, 2, 3]
Try
do x <- Just 1
y <- Nothing
z <- Just 2
return [x,y,z]
and
do x <- Just 1
y <- Just 2
z <- Just 3
return [x,y,z]
The results are the same as with your calls of `sequence`. It is >>=
which makes the difference, not `sequence`.
Sebastian
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