GHCi -- thanks ghc team !

[Jon Fairbairn]

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Eray Ozkural wrote:
> I
> have difficulty using GHCi because I can't define functions interactive=
ly.
> Would it be possible to introduce a mode to do that?

You can do this:

Loading package std ... linking ... done.
Prelude> let f x =3D 1+x
Prelude> f 2
3
Prelude> let {g 1 =3D 1; g n =3D n-1}  =

Prelude> g 1
1
Prelude> g 2
1

> That might be a lot more comfortable for sketching a piece of code.

You can't type =


f [] =3D 1
f [x] =3D x

because how would the interpreter know when you'd typed the
whole definition? But using let (without the in) looks like
what you want.

  J=F3n


-- =

J=F3n Fairbairn                                 Jon.Fairbairn@cl.cam.ac.u=
k
31 Chalmers Road                                         jf@cl.cam.ac.uk
Cambridge CB1 3SZ            +44 1223 570179 (after 14:00 only, please!)



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