3 ms·
Yes that’s exactly what the Maybe monad does! It would look like this in Haskell code doStuff :: Maybe X doStuff = do r1 <- cmd1 r2 <- cmd2
by embwbam 3y ago
Yes that’s exactly what the Maybe monad does! It would look like this in Haskell code
doStuff :: Maybe X
doStuff = do
r1 <- cmd1
r2 <- cmd2 r1
…
return rX
Which is syntactic sugar for:
doStuff = cmd1 >>= cmd2 >>= …
- dllthomas 3y agoA sometimes important difference is that every process in the pipeline is spawned at the start, and may operate on partial input. A function returning Maybe needs to complete before we know whether it returns Just or Nothing, and we can't start the next function until we have the Just in hand, as that's the input to the function.