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

[Henk-Jan van Tuyl]

On Sun, 17 May 2015 10:24:42 +0200, Henk-Jan van Tuyl <hjgtuyl at chello.nl>  
wrote:

> 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>

I forgot that this is not the default behavior of GHCi; to get this  
command, install Hoogle[0][1] and create a file called .ghci in your home  
directory, with the line:
   :def doc \x -> return $ ":!hoogle --info \"" ++ x ++ "\""

Regards,
Henk-Jan van Tuyl


[0] https://hackage.haskell.org/package/hoogle
[1] https://wiki.haskell.org/Hoogle


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