[Haskell-cafe] function arithmetic?

[Roman Cheplyaka]

* Christopher Howard <christopher.howard at frigidcode.com> [2013-08-31 21:01:38-0800]
> Hi. I was just curious about something. In one of my math textbooks I
> see expressions like this
> 
> f + g
> 
> or
> 
> (f + g)(a)
> 
> where f and g are functions. What is meant is
> 
> f(a) + g(a)
> 
> Is there a way in Haskell you can make use of syntax like that (i.e.,
> expressions like f + g and f * g to create a new function), perhaps
> by loading a module or something?

Not the syntax, but the notion itself corresponds exactly to idiom
brackets/applicative functors. In this case it's the Reader applicative.

Roman
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