confusing:lyahpop
This is an old revision of the document!
pop is already a stateful computation and push takes an Int and returns a stateful computation. Now we can rewrite our previous example of pushing 3 onto the stack and then popping two numbers off like this:
<code >
import Control.Monad.State
stackManip :: State Stack Int
stackManip = do
push 3
a <- pop
pop
<>
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