[Haskell-beginners] How to check the help page of a function?

[Henk-Jan van Tuyl]

On Sun, 17 May 2015 01:18:50 +0200, Peng Yu <pengyu.ut at gmail.com> wrote:

> Many other languages have help pages in the command (see help() in
> python and R). Why haskell doesn't have such a feature?

GHCi has such a command:
   :doc <function name>

For example:
   Prelude> :doc head
   Prelude head :: [a] -> a

   Extract the first element of a list, which must be non-empty.

   From package base
   head :: [a] -> a

Regards,
Henk-Jan van Tuyl


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