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more syntax slides

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1 parent eb823bd commit 9536d80a40e38e897a7e551df269ca034626aa64 @astro astro committed Aug 27, 2012
Showing with 78 additions and 5 deletions.
  1. +26 −0 astro.hs
  2. +52 −5 index.html
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@@ -0,0 +1,26 @@
+module Main where
+
+fac :: Integer -> Integer
+fac 1 = 1
+fac n = n * fac (n - 1)
+
+fac' :: Integer -> Integer
+fac' n =
+ case n of
+ 1 -> 1
+ _ -> n * fac (n - 1)
+
+fac'' :: Integer -> Integer
+fac'' n
+ | n <= 1 = 1
+ | otherwise = n * fac (n - 1)
+
+fac''' :: Integer -> Integer
+fac''' n =
+ if n <= 1
+ then 1
+ else n * fac (n - 1)
+
+facs = 1 : go 2
+ where go :: Integer -> [Integer]
+ go n = n : map (* n) (go (n + 1))
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@@ -66,30 +66,77 @@
</div>
<div class="slide">
<h2>Funktionen</h2>
- <pre>fac :: Integer -> Integer
+ <pre class="sh_haskell">fac :: Integer -> Integer
fac 1 = 1
fac n = n * fac (n - 1)
</pre>
<p class="note">Fakultät</p>
<p class="note">-&gt; Impliziert</p>
<p class="note">Pattern matching des Parameters</p>
<p class="note">Integer is bignum</p>
+
+ <h2>case</h2>
+ <pre class="sh_haskell">fac' :: Integer -> Integer
+fac' n =
+ case n of
+ 1 -&gt; 1
+ _ -&gt; n * fac (n - 1)
+ </pre>
+ <p class="note">Pattern matching</p>
+ <p class="note">Anonyme Variable</p>
</div>
<div class="slide">
<h2>Guards</h2>
- <pre>fac :: Integer -> Integer
-fac n
+ <pre class="sh_haskell">fac'' :: Integer -> Integer
+fac'' n
| n &lt;= 1 = 1
| otherwise = n * fac (n - 1)
</pre>
<p class="note">Boolean expression</p>
+
+ <h2>if then else</h2>
+ <pre class="sh_haskell">fac''' :: Integer -> Integer
+fac''' n =
+ if n &lt;= 1
+ then 1
+ else n * fac (n - 1)
+ </pre>
+ <p class="note">Boolean expression</p>
+</div>
+
+<div class="slide">
+ <h2>Listen</h2>
+ <pre class="sh_haskell">$ ghci
+Prelude> 2 : []
+[2]
+Prelude> 23 : []
+[23]
+Prelude> 23 : 42 : []
+[23,42]
+Prelude> 23 : 42 : 5 : []
+[23,42,5]
+Prelude> :t (:)
+(:) :: a -> [a] -> [a]
+ </pre>
+ <p class="note"></p>
+</div>
+
+<div class="slide">
+ <h2>Listen</h2>
+ <pre class="sh_haskell">facs = 1 : go 2
+ where go :: Integer -> [Integer]
+ go n = n : map (* n) (go $ n + 1)
+
+Prelude> facs !! 500
+611288549821546144419320631496946510053040745744399613938399207781308531950094880800353720198603844213369821855051249995665852739761166777440873387784823972024431693541604632490253390402221485016448489094881275898497140756808655499992463957536774753658273522343143352081610678258299859781290947510064133164625417126214683287364306533202043771696934819148200603488701298578593288295101675375228475039194518540926501811512211084741146359555616051391364512171815202852428391973770531819587555590747725222707870915089204322125602187745638954304887403405330317436980872692673627514602895425139803517823839455807896878364709108235036658336397561844224198282288969461157203049314666899393600517284430144216183492154249948251192663554129489210224225335784718743202172831724716080857069568307715110065035130707514179942202121569852186583424945734289322385681601382444331381680307765142985006245859526451817213228740320341074735777885270328149239431528071389670544598095262337701383222299067569757970109034425702794542448640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+ </pre>
+ <p class="note">($)</p>
</div>
<!--
-case
-if
let/where
module
+lambdas
-->
<div class="slide">
<h2>Currying</h2>

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