[Haskell-cafe] return in Monad class necessary?

Chris Eidhof chris at eidhof.nl
Mon Nov 26 18:15:14 EST 2007

On 26 nov 2007, at 19:48, Henning Thielemann wrote:
> I wonder whether it is a typical mistake of beginners
> to write 'return' within a do-block (that is, not at the end)
> and if it is possible to avoid this mistake by clever typing.
> In a proper monad 'return' can be fused with subsequent actions,
> and thus it is not necessary within a sequence of actions.
> However, although sensible, 'return' is also not required at the end  
> of a block.
> Has someone already thought about a replacement for monads?
I also made that mistake in the beginning, I used return instead of  
lets. I don't think it's a big problem, most users will find out once  
they've got some more experience, and it doesn't really do any harm.


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