Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-21 Thread Brandon S. Allbery KF8NH

On May 21, 2009, at 03:40 , Kalman Noel wrote:

If the goal is to be able to talk about different examples of Haskell
code in the rest of the presentation, the big topic I'd choose would  
be

called »How function definitions look like in Haskell«.


That would be (or lead directly to) referential transparency.

--
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system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu
electrical and computer engineering, carnegie mellon universityKF8NH




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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-21 Thread Lionel Barret de Nazaris

On 21/05/2009 09:40, Kalman Noel wrote:

Joe Fredette schrieb:
   

3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest
topics in haskell? I would think they would be:

* Purity/Referential Transparency
* Lazy Evaluation
* Strong Typing + Type Classes
* Monads
 


If the goal is to be able to talk about different examples of Haskell
code in the rest of the presentation, the big topic I'd choose would be
called »How function definitions look like in Haskell«.

Kalman
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My bet :
- type system without the type classes but with comparision with usual 
(c++) type systems.

- function definitions, with a hint at pattern matching
- lazyness. (see the searching a maybe list on the begineer list, it is 
a very good example).
- advanced topic : monads, type classes, etc -> just to say they are 
here and describe what they allow (state, exception), etc.


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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-21 Thread Kalman Noel
Joe Fredette schrieb:
> 3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest
> topics in haskell? I would think they would be:
> 
> * Purity/Referential Transparency
> * Lazy Evaluation
> * Strong Typing + Type Classes
> * Monads

If the goal is to be able to talk about different examples of Haskell
code in the rest of the presentation, the big topic I'd choose would be
called »How function definitions look like in Haskell«.

Kalman
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Ryan Ingram
On Mon, May 18, 2009 at 11:33 AM, Eugene Kirpichov  wrote:
> The main bullet point is missing: Correctness.
>
> How could we have forgotten quickcheck?
>
>> quickCheck (\xs -> sort (sort xs) == sort xs)
> OK, 100 tests passed.

I like this, but given that you have a whole slide, I might write this:

isSorted :: Ord a => [a] -> Bool
isSorted [] = True
isSorted [x] = True
isSorted (x:y:rest) = x <= y && isSorted (y:rest)

> quickCheck (\xs -> isSorted (sort xs))
OK, 100 tests passed.

Or, if you want to lead into a talk about fusion and/or higher order functions:

isSorted [] = True
isSorted (x:xs) = snd $ foldl' check (head x, True) xs where
check (prevElem, restSorted) thisElem = (thisElem, prevElem <=
thisElem && restSorted)

  -- ryan
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Eugene Kirpichov
The main bullet point is missing: Correctness.

How could we have forgotten quickcheck?

> quickCheck (\xs -> sort (sort xs) == sort xs)
OK, 100 tests passed.

2009/5/18 Don Stewart :
> adam.turoff:
>> On Mon, May 18, 2009 at 2:06 PM, Don Stewart  wrote:
>> > Exactly: focus on what the user wants to do (e.g. write multicore code,
>> > write safe code, write code quickly), not how that is achieved:
>> > "bounded parametric polymorphism" or "monads"
>>
>> Parametric polymorphism is a big win, and highlights something
>> a user wants to do.  A *shallow* overview (one bullet, one
>> function) might fit.  Off the top of my head:
>>
>>   incr :: (Num a) => a -> a
>>   incr = (+ 1)
>>
>> Writing that operation in other languages is either (a) repeated for
>> every numeric type or (b) not typesafe.  Haskell is one of the few
>> that delivers both, and that is worth underscoring.  And it gives
>> you an opportunity to wave your hands and talk about type
>> inferencing without wasting room on a slide.
>>
>
> Right, so talk about "Reuse!" (polymorphism) , "Productivity" (type
> inference) "Performance" (static typing + optimizer)
>
> -- Don
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Don Stewart
adam.turoff:
> On Mon, May 18, 2009 at 2:06 PM, Don Stewart  wrote:
> > Exactly: focus on what the user wants to do (e.g. write multicore code,
> > write safe code, write code quickly), not how that is achieved:
> > "bounded parametric polymorphism" or "monads"
> 
> Parametric polymorphism is a big win, and highlights something
> a user wants to do.  A *shallow* overview (one bullet, one
> function) might fit.  Off the top of my head:
> 
>   incr :: (Num a) => a -> a
>   incr = (+ 1)
> 
> Writing that operation in other languages is either (a) repeated for
> every numeric type or (b) not typesafe.  Haskell is one of the few
> that delivers both, and that is worth underscoring.  And it gives
> you an opportunity to wave your hands and talk about type
> inferencing without wasting room on a slide.
> 

Right, so talk about "Reuse!" (polymorphism) , "Productivity" (type
inference) "Performance" (static typing + optimizer)

-- Don
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Adam Turoff
On Mon, May 18, 2009 at 2:06 PM, Don Stewart  wrote:
> Exactly: focus on what the user wants to do (e.g. write multicore code,
> write safe code, write code quickly), not how that is achieved:
> "bounded parametric polymorphism" or "monads"

Parametric polymorphism is a big win, and highlights something
a user wants to do.  A *shallow* overview (one bullet, one
function) might fit.  Off the top of my head:

  incr :: (Num a) => a -> a
  incr = (+ 1)

Writing that operation in other languages is either (a) repeated for
every numeric type or (b) not typesafe.  Haskell is one of the few
that delivers both, and that is worth underscoring.  And it gives
you an opportunity to wave your hands and talk about type
inferencing without wasting room on a slide.

Don is right.  Forget the details.  Cover the capabilities,
not the mechanics.

-- Adam
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Don Stewart
ekirpichov:
> Actually, I don't think it's a good idea to introduce monads on one of
> the 3-4 slides. While it *is* a core concept, it's not one of the
> advertising "bullet points"; and 1 slide is not enough to show what
> *use* monads are, let alone what they actually *are*.
> 
> I'd probably suggest you to show something parallelism-related on that
> slide: for example, STM. Showing an "atomically do foo" and saying
> "And here, we atomically do foo" may turn out impressive :)
> 

Exactly: focus on what the user wants to do (e.g. write multicore code,
write safe code, write code quickly), not how that is achieved:
"bounded parametric polymorphism" or "monads"
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Don Stewart
jfredett:
> While an incredibly small font is a clever option, a more serious  
> suggestion may be as follows.
>
> 3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest  
> topics in haskell? I would think they would be:
>
> * Purity/Referential Transparency
> * Lazy Evaluation
> * Strong Typing + Type Classes
> * Monads

Parallelism
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Miguel Mitrofanov


On 18 May 2009, at 20:29, Joe Fredette wrote:

While an incredibly small font is a clever option, a more serious  
suggestion may be as follows.


3-4 slides imply 3-4 topics, so the question is what are the 3-4  
biggest topics in haskell? I would think they would be:


* Purity/Referential Transparency
* Lazy Evaluation
* Strong Typing + Type Classes
* Monads


I'd say monads are not of that importance; parametric polymorphism may  
be a better choice.






Assuming you have, say, 10-15 minutes for the talk, and the people  
there are versed with imperative programming and maybe have some  
experience in functional programming, you can probably jump over  
each of those slides in about a minute, just enough to touch the  
subject.


I also assume that you don't need to fit the whole presentation in  
3-4 slides, if you do, then  yah.



/Joe


David Leimbach wrote:

Use an incredibly small font.

On Mon, May 18, 2009 at 8:16 AM, John Van Enk mailto:vane...@gmail.com 
>> wrote:


   Hi all,
I'm giving a presentation to an IEEE group on Embedded  
DSL's and

   Haskell at the end of June. I need a 3 to 4 slide introduction to
   Haskell. What suggestions does the community have? Is such a short
   intro possible?
It just needs to introduce the basics so I can show some code
   without alienating the audience. I'm hoping some one else has
   attempted this before, but if not, some boiler plate slides could
   be useful for every one!

   -- /jve

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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Joe Fredette
Well, since the topic was EDSLs, and those generally involve monads (at 
least from what I've seen), it might be wise to touch on them. However, 
perhaps the fourth slide would just be a catchall? HOFs, some STM/Monad 
stuff, etc? The topics I suggested just seem to me to be the 4 core 
concepts you must understand to use haskell effectively.


/joe

Eugene Kirpichov wrote:

Actually, I don't think it's a good idea to introduce monads on one of
the 3-4 slides. While it *is* a core concept, it's not one of the
advertising "bullet points"; and 1 slide is not enough to show what
*use* monads are, let alone what they actually *are*.

I'd probably suggest you to show something parallelism-related on that
slide: for example, STM. Showing an "atomically do foo" and saying
"And here, we atomically do foo" may turn out impressive :)

And yes, of course HOF's.

Also, on the Strong Typing slide, probably you could fit in an
algebraic datatype and a smallish function over it in pattern-matched
style.

2009/5/18 Joe Fredette :
  

While an incredibly small font is a clever option, a more serious suggestion
may be as follows.

3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest
topics in haskell? I would think they would be:

* Purity/Referential Transparency
* Lazy Evaluation
* Strong Typing + Type Classes
* Monads

Assuming you have, say, 10-15 minutes for the talk, and the people there are
versed with imperative programming and maybe have some experience in
functional programming, you can probably jump over each of those slides in
about a minute, just enough to touch the subject.

I also assume that you don't need to fit the whole presentation in 3-4
slides, if you do, then  yah.


/Joe


David Leimbach wrote:


Use an incredibly small font.

On Mon, May 18, 2009 at 8:16 AM, John Van Enk mailto:vane...@gmail.com>> wrote:

   Hi all,
   I'm giving a presentation to an IEEE group on Embedded DSL's and
   Haskell at the end of June. I need a 3 to 4 slide introduction to
   Haskell. What suggestions does the community have? Is such a short
   intro possible?
   It just needs to introduce the basics so I can show some code
   without alienating the audience. I'm hoping some one else has
   attempted this before, but if not, some boiler plate slides could
   be useful for every one!

   --/jve

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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Eugene Kirpichov
Actually, I don't think it's a good idea to introduce monads on one of
the 3-4 slides. While it *is* a core concept, it's not one of the
advertising "bullet points"; and 1 slide is not enough to show what
*use* monads are, let alone what they actually *are*.

I'd probably suggest you to show something parallelism-related on that
slide: for example, STM. Showing an "atomically do foo" and saying
"And here, we atomically do foo" may turn out impressive :)

And yes, of course HOF's.

Also, on the Strong Typing slide, probably you could fit in an
algebraic datatype and a smallish function over it in pattern-matched
style.

2009/5/18 Joe Fredette :
> While an incredibly small font is a clever option, a more serious suggestion
> may be as follows.
>
> 3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest
> topics in haskell? I would think they would be:
>
> * Purity/Referential Transparency
> * Lazy Evaluation
> * Strong Typing + Type Classes
> * Monads
>
> Assuming you have, say, 10-15 minutes for the talk, and the people there are
> versed with imperative programming and maybe have some experience in
> functional programming, you can probably jump over each of those slides in
> about a minute, just enough to touch the subject.
>
> I also assume that you don't need to fit the whole presentation in 3-4
> slides, if you do, then  yah.
>
>
> /Joe
>
>
> David Leimbach wrote:
>>
>> Use an incredibly small font.
>>
>> On Mon, May 18, 2009 at 8:16 AM, John Van Enk > > wrote:
>>
>>    Hi all,
>>        I'm giving a presentation to an IEEE group on Embedded DSL's and
>>    Haskell at the end of June. I need a 3 to 4 slide introduction to
>>    Haskell. What suggestions does the community have? Is such a short
>>    intro possible?
>>        It just needs to introduce the basics so I can show some code
>>    without alienating the audience. I'm hoping some one else has
>>    attempted this before, but if not, some boiler plate slides could
>>    be useful for every one!
>>
>>    --    /jve
>>
>>    ___
>>    Haskell-Cafe mailing list
>>    haskell-c...@haskell.org 
>>    http://www.haskell.org/mailman/listinfo/haskell-cafe
>>
>>
>> 
>>
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>



-- 
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Web IR developer, market.yandex.ru
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Andrew Wagner
Don't forget to include higher-order functions in one of those important
points.

On Mon, May 18, 2009 at 12:36 PM, John Van Enk  wrote:

> Thanks Joe,
>
> Your assumption is correct--the whole presentation will be longer. I wanted
> to use 3 or 4 slides to introduce the language and the balance for the
> interesting stuff. :P
>
> /jve
>
> PS to Joe: I will not forget to reply to all. I will not forget to reply to
> all. I will not forget to reply to all. There, hopefully I won't forget any
> more. :)
>
> On Mon, May 18, 2009 at 12:29 PM, Joe Fredette  wrote:
>
>> While an incredibly small font is a clever option, a more serious
>> suggestion may be as follows.
>>
>> 3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest
>> topics in haskell? I would think they would be:
>>
>> * Purity/Referential Transparency
>> * Lazy Evaluation
>> * Strong Typing + Type Classes
>> * Monads
>>
>> Assuming you have, say, 10-15 minutes for the talk, and the people there
>> are versed with imperative programming and maybe have some experience in
>> functional programming, you can probably jump over each of those slides in
>> about a minute, just enough to touch the subject.
>>
>> I also assume that you don't need to fit the whole presentation in 3-4
>> slides, if you do, then  yah.
>>
>>
>> /Joe
>>
>>
>> David Leimbach wrote:
>>
>>> Use an incredibly small font.
>>>
>>> On Mon, May 18, 2009 at 8:16 AM, John Van Enk >> vane...@gmail.com>> wrote:
>>>
>>>Hi all,
>>>I'm giving a presentation to an IEEE group on Embedded DSL's and
>>>Haskell at the end of June. I need a 3 to 4 slide introduction to
>>>Haskell. What suggestions does the community have? Is such a short
>>>intro possible?
>>>It just needs to introduce the basics so I can show some code
>>>without alienating the audience. I'm hoping some one else has
>>>attempted this before, but if not, some boiler plate slides could
>>>be useful for every one!
>>>
>>>--/jve
>>>
>>>___
>>>Haskell-Cafe mailing list
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>>>http://www.haskell.org/mailman/listinfo/haskell-cafe
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>>>
>>> 
>>>
>>> ___
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>>>
>>>
>>
>
>
> --
> /jve
>
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread John Van Enk
Thanks Joe,

Your assumption is correct--the whole presentation will be longer. I wanted
to use 3 or 4 slides to introduce the language and the balance for the
interesting stuff. :P

/jve

PS to Joe: I will not forget to reply to all. I will not forget to reply to
all. I will not forget to reply to all. There, hopefully I won't forget any
more. :)

On Mon, May 18, 2009 at 12:29 PM, Joe Fredette  wrote:

> While an incredibly small font is a clever option, a more serious
> suggestion may be as follows.
>
> 3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest
> topics in haskell? I would think they would be:
>
> * Purity/Referential Transparency
> * Lazy Evaluation
> * Strong Typing + Type Classes
> * Monads
>
> Assuming you have, say, 10-15 minutes for the talk, and the people there
> are versed with imperative programming and maybe have some experience in
> functional programming, you can probably jump over each of those slides in
> about a minute, just enough to touch the subject.
>
> I also assume that you don't need to fit the whole presentation in 3-4
> slides, if you do, then  yah.
>
>
> /Joe
>
>
> David Leimbach wrote:
>
>> Use an incredibly small font.
>>
>> On Mon, May 18, 2009 at 8:16 AM, John Van Enk > vane...@gmail.com>> wrote:
>>
>>Hi all,
>>I'm giving a presentation to an IEEE group on Embedded DSL's and
>>Haskell at the end of June. I need a 3 to 4 slide introduction to
>>Haskell. What suggestions does the community have? Is such a short
>>intro possible?
>>It just needs to introduce the basics so I can show some code
>>without alienating the audience. I'm hoping some one else has
>>attempted this before, but if not, some boiler plate slides could
>>be useful for every one!
>>
>>--/jve
>>
>>___
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>>
>> 
>>
>> ___
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>>
>>
>


-- 
/jve
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Joe Fredette
While an incredibly small font is a clever option, a more serious 
suggestion may be as follows.


3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest 
topics in haskell? I would think they would be:


* Purity/Referential Transparency
* Lazy Evaluation
* Strong Typing + Type Classes
* Monads

Assuming you have, say, 10-15 minutes for the talk, and the people there 
are versed with imperative programming and maybe have some experience in 
functional programming, you can probably jump over each of those slides 
in about a minute, just enough to touch the subject.


I also assume that you don't need to fit the whole presentation in 3-4 
slides, if you do, then  yah.



/Joe


David Leimbach wrote:

Use an incredibly small font.

On Mon, May 18, 2009 at 8:16 AM, John Van Enk > wrote:


Hi all,
 
I'm giving a presentation to an IEEE group on Embedded DSL's and

Haskell at the end of June. I need a 3 to 4 slide introduction to
Haskell. What suggestions does the community have? Is such a short
intro possible?
 
It just needs to introduce the basics so I can show some code

without alienating the audience. I'm hoping some one else has
attempted this before, but if not, some boiler plate slides could
be useful for every one!

-- 
/jve


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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Donnie Jones
Use an incredibly small font AND Haskell FRP [1] to zoom and enlarge
the font as you move your mouse over the text.  ;)

1. http://en.wikipedia.org/wiki/Functional_reactive_programming
--
Donnie Jones


On Mon, May 18, 2009 at 10:56 AM, David Leimbach  wrote:
> Use an incredibly small font.
>
> On Mon, May 18, 2009 at 8:16 AM, John Van Enk  wrote:
>>
>> Hi all,
>>
>> I'm giving a presentation to an IEEE group on Embedded DSL's and Haskell
>> at the end of June. I need a 3 to 4 slide introduction to Haskell. What
>> suggestions does the community have? Is such a short intro possible?
>>
>> It just needs to introduce the basics so I can show some code without
>> alienating the audience. I'm hoping some one else has attempted this before,
>> but if not, some boiler plate slides could be useful for every one!
>> --
>> /jve
>>
>> ___
>> Haskell-Cafe mailing list
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>
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread David Leimbach
Use an incredibly small font.

On Mon, May 18, 2009 at 8:16 AM, John Van Enk  wrote:

> Hi all,
>
> I'm giving a presentation to an IEEE group on Embedded DSL's and Haskell at
> the end of June. I need a 3 to 4 slide introduction to Haskell. What
> suggestions does the community have? Is such a short intro possible?
>
> It just needs to introduce the basics so I can show some code without
> alienating the audience. I'm hoping some one else has attempted this before,
> but if not, some boiler plate slides could be useful for every one!
>
> --
> /jve
>
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Don Stewart
vanenkj:
> Hi all,
>  
> I'm giving a presentation to an IEEE group on Embedded DSL's and Haskell at 
> the
> end of June. I need a 3 to 4 slide introduction to Haskell. What suggestions
> does the community have? Is such a short intro possible?
>  
> It just needs to introduce the basics so I can show some code without
> alienating the audience. I'm hoping some one else has attempted this before,
> but if not, some boiler plate slides could be useful for every one!

Boil down SimonPJ's OSCON talk?

"A taste of Haskell"


http://research.microsoft.com/en-us/um/people/simonpj/papers/haskell-tutorial/index.htm
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Re: [Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread Eugene Kirpichov
Just please don't show them qsort and fibonacci!

2009/5/18 John Van Enk :
> Hi all,
>
> I'm giving a presentation to an IEEE group on Embedded DSL's and Haskell at
> the end of June. I need a 3 to 4 slide introduction to Haskell. What
> suggestions does the community have? Is such a short intro possible?
>
> It just needs to introduce the basics so I can show some code without
> alienating the audience. I'm hoping some one else has attempted this before,
> but if not, some boiler plate slides could be useful for every one!
> --
> /jve
>
> ___
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>



-- 
Eugene Kirpichov
Web IR developer, market.yandex.ru
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[Haskell-cafe] Haskell in 3 Slides

2009-05-18 Thread John Van Enk
Hi all,

I'm giving a presentation to an IEEE group on Embedded DSL's and Haskell at
the end of June. I need a 3 to 4 slide introduction to Haskell. What
suggestions does the community have? Is such a short intro possible?

It just needs to introduce the basics so I can show some code without
alienating the audience. I'm hoping some one else has attempted this before,
but if not, some boiler plate slides could be useful for every one!

-- 
/jve
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