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1 files changed, 161 insertions, 109 deletions

diff --git a/articles/tictactoe/index.html b/articles/tictactoe/index.html
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@@ -7,7 +7,7 @@
     <meta name="description" content="">
     <meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
 
-    <meta name="generator" content="Hugo 0.17" />
+    <meta name="generator" content="Hugo 0.26" />
 
     <title>Nine Nines: Erlang Tic Tac Toe</title>
 
@@ -74,89 +74,89 @@
 	</p>
 </header>
 
-<div class="paragraph"><p>Everyone knows <a href="http://en.wikipedia.org/wiki/Tic-tac-toe">Tic Tac Toe</a>,

-right?</p></div>

-<div class="paragraph"><p>Players choose either to be the Xs or the Os, then place their symbol

-on a 3x3 board one after another, trying to create a line of 3 of them.</p></div>

-<div class="paragraph"><p>Writing an algorithm to check for victory sounds easy, right? It&#8217;s

-easily tested, considering there&#8217;s only 8 possible winning rows (3 horizontal,

-3 vertical and 2 diagonal).</p></div>

-<div class="paragraph"><p>In Erlang though, you probably wouldn&#8217;t want an algorithm. Erlang has

-this cool feature called pattern matching which will allow us to completely

-avoid writing the algorithm by instead letting us match directly on the

-solutions.</p></div>

-<div class="paragraph"><p>Let&#8217;s first create a board. A board is a list of 3 rows each containing

-3 columns. It can also be thought of as a tuple containing 9 elements.

-A tuple is easier to manipulate so this is what we are going to use.

-Each position can either contain an <code>x</code>, an <code>o</code>,

-or be <code>undefined</code>.</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt><span style="font-weight: bold"><span style="color: #000000">new</span></span>() <span style="color: #990000">-&gt;</span>

-    {<span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>,

-     <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>,

-     <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>}<span style="color: #990000">.</span></tt></pre></div></div>

-<div class="paragraph"><p>Now that we have a board, if we want to play, we need a function that

-will allow players to, you know, actually play their moves. Rows and

-columns are numbered 1 to 3 so we need a little math to correctly

-deduce the element&#8217;s position.</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt><span style="font-weight: bold"><span style="color: #000000">play</span></span>(<span style="color: #009900">Who</span>, <span style="color: #009900">X</span>, <span style="color: #009900">Y</span>, <span style="color: #009900">Board</span>) <span style="color: #990000">-&gt;</span>

-    <span style="font-weight: bold"><span style="color: #000080">setelement</span></span>((<span style="color: #009900">Y</span> <span style="color: #990000">-</span> <span style="color: #993399">1</span>) <span style="color: #990000">*</span> <span style="color: #993399">3</span> <span style="color: #990000">+</span> <span style="color: #009900">X</span>, <span style="color: #009900">Board</span>, <span style="color: #009900">Who</span>)<span style="color: #990000">.</span></tt></pre></div></div>

-<div class="paragraph"><p>This function returns the board with the element modified. Of course,

-as you probably noticed, we aren&#8217;t checking that the arguments are correct,

-or that the element was already set. This is left as an exercise to the

-reader.</p></div>

-<div class="paragraph"><p>After playing the move, we need to check whether someone won. That&#8217;s

-where you&#8217;d write an algorithm, and that&#8217;s where I wouldn&#8217;t. Let&#8217;s just

-pattern match all of them!</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt><span style="font-weight: bold"><span style="color: #000000">check</span></span>(<span style="color: #009900">Board</span>) <span style="color: #990000">-&gt;</span>

-    <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> <span style="color: #009900">Board</span> <span style="font-weight: bold"><span style="color: #0000FF">of</span></span>

-        {<span style="color: #FF6600">x</span>, <span style="color: #FF6600">x</span>, <span style="color: #FF6600">x</span>,

-         <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,

-         <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>} <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">victory</span>, <span style="color: #FF6600">x</span>};

-

-        {<span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,

-         <span style="color: #990000">_</span>, <span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>,

-         <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #FF6600">x</span>} <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">victory</span>, <span style="color: #FF6600">x</span>};

-

-        {<span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,

-         <span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,

-         <span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>} <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">victory</span>, <span style="color: #FF6600">x</span>};

-

-        <span style="font-style: italic"><span style="color: #9A1900">%% [snip]</span></span>

-

-        <span style="color: #990000">_</span> <span style="color: #990000">-&gt;</span> <span style="color: #FF6600">ok</span>

-    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>

-<div class="paragraph"><p>Pattern matching allows us to simply <em>draw</em> the solutions

-directly inside our code, and if the board matches any of them, then we

-have a victory or a draw, otherwise the game can continue.</p></div>

-<div class="paragraph"><p>The <code>_</code> variable is special in that it always matches,

-allowing us to focus strictly on the winning row. And because it&#8217;s very

-graphical, if we were to have messed up somewhere, then we&#8217;d only need

-take a quick glance to be sure the winning solutions are the right ones.</p></div>

-<div class="paragraph"><p>Erlang allows us to transform algorithms into very graphical code thanks

-to its pattern matching feature, and let us focus on doing things instead

-of writing algorithms to do things.</p></div>

-<div class="ulist"><ul>

-<li>

-<p>

-<a href="/res/tictactoe.erl">tictactoe.erl</a>

-</p>

-</li>

-</ul></div>

+<div class="paragraph"><p>Everyone knows <a href="http://en.wikipedia.org/wiki/Tic-tac-toe">Tic Tac Toe</a>,
+right?</p></div>
+<div class="paragraph"><p>Players choose either to be the Xs or the Os, then place their symbol
+on a 3x3 board one after another, trying to create a line of 3 of them.</p></div>
+<div class="paragraph"><p>Writing an algorithm to check for victory sounds easy, right? It&#8217;s
+easily tested, considering there&#8217;s only 8 possible winning rows (3 horizontal,
+3 vertical and 2 diagonal).</p></div>
+<div class="paragraph"><p>In Erlang though, you probably wouldn&#8217;t want an algorithm. Erlang has
+this cool feature called pattern matching which will allow us to completely
+avoid writing the algorithm by instead letting us match directly on the
+solutions.</p></div>
+<div class="paragraph"><p>Let&#8217;s first create a board. A board is a list of 3 rows each containing
+3 columns. It can also be thought of as a tuple containing 9 elements.
+A tuple is easier to manipulate so this is what we are going to use.
+Each position can either contain an <code>x</code>, an <code>o</code>,
+or be <code>undefined</code>.</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000000">new</span></span>() <span style="color: #990000">-&gt;</span>
+    {<span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>,
+     <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>,
+     <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>, <span style="color: #000080">undefined</span>}<span style="color: #990000">.</span></tt></pre></div></div>
+<div class="paragraph"><p>Now that we have a board, if we want to play, we need a function that
+will allow players to, you know, actually play their moves. Rows and
+columns are numbered 1 to 3 so we need a little math to correctly
+deduce the element&#8217;s position.</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000000">play</span></span>(<span style="color: #009900">Who</span>, <span style="color: #009900">X</span>, <span style="color: #009900">Y</span>, <span style="color: #009900">Board</span>) <span style="color: #990000">-&gt;</span>
+    <span style="font-weight: bold"><span style="color: #000080">setelement</span></span>((<span style="color: #009900">Y</span> <span style="color: #990000">-</span> <span style="color: #993399">1</span>) <span style="color: #990000">*</span> <span style="color: #993399">3</span> <span style="color: #990000">+</span> <span style="color: #009900">X</span>, <span style="color: #009900">Board</span>, <span style="color: #009900">Who</span>)<span style="color: #990000">.</span></tt></pre></div></div>
+<div class="paragraph"><p>This function returns the board with the element modified. Of course,
+as you probably noticed, we aren&#8217;t checking that the arguments are correct,
+or that the element was already set. This is left as an exercise to the
+reader.</p></div>
+<div class="paragraph"><p>After playing the move, we need to check whether someone won. That&#8217;s
+where you&#8217;d write an algorithm, and that&#8217;s where I wouldn&#8217;t. Let&#8217;s just
+pattern match all of them!</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000000">check</span></span>(<span style="color: #009900">Board</span>) <span style="color: #990000">-&gt;</span>
+    <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> <span style="color: #009900">Board</span> <span style="font-weight: bold"><span style="color: #0000FF">of</span></span>
+        {<span style="color: #FF6600">x</span>, <span style="color: #FF6600">x</span>, <span style="color: #FF6600">x</span>,
+         <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,
+         <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>} <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">victory</span>, <span style="color: #FF6600">x</span>};
+
+        {<span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,
+         <span style="color: #990000">_</span>, <span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>,
+         <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #FF6600">x</span>} <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">victory</span>, <span style="color: #FF6600">x</span>};
+
+        {<span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,
+         <span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>,
+         <span style="color: #FF6600">x</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>} <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">victory</span>, <span style="color: #FF6600">x</span>};
+
+        <span style="font-style: italic"><span style="color: #9A1900">%% [snip]</span></span>
+
+        <span style="color: #990000">_</span> <span style="color: #990000">-&gt;</span> <span style="color: #FF6600">ok</span>
+    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>
+<div class="paragraph"><p>Pattern matching allows us to simply <em>draw</em> the solutions
+directly inside our code, and if the board matches any of them, then we
+have a victory or a draw, otherwise the game can continue.</p></div>
+<div class="paragraph"><p>The <code>_</code> variable is special in that it always matches,
+allowing us to focus strictly on the winning row. And because it&#8217;s very
+graphical, if we were to have messed up somewhere, then we&#8217;d only need
+take a quick glance to be sure the winning solutions are the right ones.</p></div>
+<div class="paragraph"><p>Erlang allows us to transform algorithms into very graphical code thanks
+to its pattern matching feature, and let us focus on doing things instead
+of writing algorithms to do things.</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="/res/tictactoe.erl">tictactoe.erl</a>
+</p>
+</li>
+</ul></div>
 
 </article>
 </div>
@@ -165,55 +165,107 @@ of writing algorithms to do things.</p></div>
 <h3>More articles</h3>
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+		
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+		
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+		
+			<li><a href="https://ninenines.eu/articles/cowboy-2.0.0-rc.1/">Cowboy 2.0 release candidate 1</a></li>
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-		<li><a href="https://ninenines.eu/articles/cowboy-2.0.0-rc.1/">Cowboy 2.0 release candidate 1</a></li>
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+		
 	
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+		
+			<li><a href="https://ninenines.eu/articles/website-update/">Website update</a></li>
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+		
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