Chris Kuklewicz wrote:
Almost everything is explained under
http://www.haskell.org/ghc/docs/6.4.1/html/users_guide/ghci.html
Ok. How would a visitor to the Haskell site find this document? If this
is the correct document for a beginner to start with Haskell, perhaps
the site should be updated to point to it instead of the documents it
currently points to.
I find some usability problems in the documentation section. Think of
usability in terms of barriers. If you have low barriers, a lot of
people will have enough motivation to cross them and get started with
Haskell. If the barriers are very high, only the most intent and
motivated users will get started. Barriers are bad.
Consider some barriers for a user who wants to learn Haskell:
* There's no way for a new user to figure out how to successfully run
the simplest Haskell program.
* The first tutorial listed requires the user to give up some personal
information before getting the tutorial.
These are very significant barriers.
Sure, it's not all bad. For example, Haskell has a friendly community
(low barrier). But the barriers that exist are a problem because they
hit the person who is trying to take the very very first step. If you
can make that *fist* step easier, more people will take it.
The main things is: The ghci prompt accepts either command, starting
with a color such as :load "filename" or haskell IO code, since it
is in a do-block. Thus let is required.
I understand that the design of Haskell might force this behaviour (I
don't know, but I guess it must). The best solution I can think of (from
a usability POV) is to provide a very brief tutorial, just 1/2 page,
just enough to get someone through "hello world", and put it right at
the top of the Learning Haskell section. I would remove the Intro
section (it would fit better on the front page) and replace it with a
1/2 page tutorial. Something like this:
-------------// Sugestion -------------
40-SECOND INTRO TO HASKELL
(You must have <link>Hugs or GHC installed</link>)
1. Open a text editor and type:
fac :: Integer -> Integer
fac 0 = 1
fac n | n > 0 = n * fac (n-1)
2. Save as "fac.hs"
3. On a terminal:
$ ghci
Prelude> :load fac.hs
Compiling Main ( fac.hs, interpreted )
Ok, modules loaded: Main.
*Main> fac 12
479001600
4. Press Ctrl+D to exit.
For more information, look at the following tutorials:
-------------// Sugestion -------------
There. That's brief, and it's enough to get the user past the first
step. It sends the message that Haskell is not so scary.
More typically you would write your code in a file, as shown in:
http://www.haskell.org/ghc/docs/6.4.1/html/users_guide/ch03s02.html
Thanks.
Best,
Daniel.
--
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