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<div class="section" id="chapter-2-clojure-koans">
<h1>Chapter 2: Clojure Koans<a class="headerlink" href="#chapter-2-clojure-koans" title="Permalink to this headline">¶</a></h1>
<p>The Clojure Koans are a series of exercises designed to teach Clojure. Periodically
through the track 2 curriculum we’ll be referencing them. For this document we’ll
make sure we can get them downloaded, setup, and you can even start doing the first
couple sets of problems.</p>
<p>More information can be found at the Clojure Koans website: http://www.clojurekoans.com</p>
<div class="section" id="getting-started">
<h2>Getting started<a class="headerlink" href="#getting-started" title="Permalink to this headline">¶</a></h2>
<p>First lets clone the koans repository:</p>
<p><code class="docutils literal"><span class="pre">git</span> <span class="pre">clone</span> <span class="pre">git://github.com/functional-koans/clojure-koans.git</span></code></p>
<p>Lets poke around the repo we just cloned:</p>
<p><code class="docutils literal"><span class="pre">cd</span> <span class="pre">clojure-koans</span></code></p>
<p>Inside here there should be a src directory containing the following:</p>
<div class="highlight-none"><div class="highlight"><pre><span></span>└── src
└── koans
├── 01_equalities.clj
├── 02_lists.clj
├── 03_vectors.clj
├── 04_sets.clj
├── 05_maps.clj
├── 06_functions.clj
├── 07_conditionals.clj
├── 08_higher_order_functions.clj
├── 09_runtime_polymorphism.clj
├── 10_lazy_sequences.clj
├── 11_sequence_comprehensions.clj
├── 12_creating_functions.clj
├── 13_recursion.clj
├── 14_destructuring.clj
├── 15_refs.clj
├── 16_atoms.clj
├── 17_macros.clj
├── 18_datatypes.clj
├── 19_java_interop.clj
├── 20_partition.clj
└── 21_group_by.clj
</pre></div>
</div>
<p>From the <code class="docutils literal"><span class="pre">clojure-koans</span></code> directory run:</p>
<p><code class="docutils literal"><span class="pre">lein</span> <span class="pre">koan</span> <span class="pre">run</span></code></p>
<p>This will start executing the koans. You should see something similar to the following:</p>
<div class="highlight-none"><div class="highlight"><pre><span></span>Starting auto-runner...
Considering /home/brian/repos/clojure-koans/src/koans/01_equalities.clj...
Now meditate upon /home/brian/repos/clojure-koans/src/koans/01_equalities.clj:6
---------------------
Assertion failed!
We shall contemplate truth by testing reality, via equality
(= __ true)
</pre></div>
</div>
<p>Now open up the clojure-koans base repository directory in atom.
Open up the first set of koans <code class="docutils literal"><span class="pre">01_equalities.clj</span></code>. The objective of the koans is to
fix the assertion that is currently being displayed in your terminal by filling in
the <code class="docutils literal"><span class="pre">__</span></code>. As you save the file it will check to see if your answer is correct and
move on to the next koan.</p>
<p>To solve the first one, lets change:</p>
<div class="highlight-clojure"><div class="highlight"><pre><span></span> <span class="s">"We shall contemplate truth by testing reality, via equality"</span>
<span class="p">(</span><span class="nb">= </span><span class="nv">__</span> <span class="nv">true</span><span class="p">)</span>
</pre></div>
</div>
<p>to:</p>
<div class="highlight-clojure"><div class="highlight"><pre><span></span> <span class="s">"We shall contemplate truth by testing reality, via equality"</span>
<span class="p">(</span><span class="nb">= </span><span class="nv">true</span> <span class="nv">true</span><span class="p">)</span>
</pre></div>
</div>
<p>Save the file, we should now see the koan runner move on to the next problem.
Try to get through the 1st set of koans before tomorrow:</p>
<div class="highlight-none"><div class="highlight"><pre><span></span>01_equalities.clj
</pre></div>
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