[Haskell-beginners] Here's why functions should return functions
Costello, Roger L.
costello at mitre.org
Sun Jul 29 16:30:59 CEST 2012
Thiago Negri wrote:
> What's the advantage of using this:
> (value . square . successor . lift) 4
> data Lift a = Function a
> lift = Function
> successor (Function a) = lift (a + 1)
> square (Function a) = lift (a * a)
> value (Function a) = a
> Over this:
> (square . successor) 4
> successor = (+1)
> square a = a * a
There's no advantage, that I can see, of the former over the latter.
Thanks Thiago for pointing this out. This is very helpful. It helps me to avoid continuing on a wrong course of thought.
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