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                    Comparing Vectors
            
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                    Map Syntax
            
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                    Map Extraction with keys & vals
            
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                    Collection of Collections
            
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                    Exercise: Model People
            
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                    Level 4 - Functions
            
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                    Defining Functions
            
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                    Local Assignment with let
            
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                    Higher Order Functions
            
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                    map function
            
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                    reduce function
            
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                    Exercise: Find the average
            
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                    Exercise: Map Reduce Sandwich
            
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                    Level 5 - Flow Control & Logic
            
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                    Boolean values
            
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                    if
            
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                                <h1 id="what-does-clojure-look-like">What does Clojure look like?</h1>
<h2 id="writing-clojure-with-parentheses">Writing Clojure with parentheses</h2>
<p> Parentheses <code>( )</code> are a list in Clojure and define the structure of your code.</p>
<p> A left parenthesis is the start of the list and needs a matching right parenthesis.  If you have unmatched parentheses then Clojure will not read your code correctly and you will get an error.</p>
<p> <em>Editors that support Clojure help you manage your parentheses</em></p>
<h2 id="calling-functions">Calling functions</h2>
<p>The first thing in a list is a call to a <em>function</em>.</p>
<p>Calling functions make your code do something.  You usually call a function along with one or more values (referred to as arguments).</p>
<p>There are many <a href="https://clojure.org/api" target="_blank">built-in functions in Clojure</a> and you can also define your own.</p>
<p>Here are some examples of calling functions:</p>
<pre><code class="lang-clojure">(<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> <span class="hljs-number">3</span> <span class="hljs-number">4</span>)

(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> username <span class="hljs-string">&quot;john&quot;</span>)

(<span class="hljs-name"><span class="hljs-builtin-name">str</span></span> <span class="hljs-string">&quot;Hello&quot;</span> <span class="hljs-string">&quot; &quot;</span> <span class="hljs-string">&quot;World!&quot;</span>)

(<span class="hljs-name"><span class="hljs-builtin-name">str</span></span> <span class="hljs-string">&quot;Welcome to our website: &quot;</span> (<span class="hljs-name">clojure.string/capitalize</span> username))
</code></pre>
<p><code>+</code>, <code>str</code> and <code>def</code> are all functions.</p>
<p>When these functions get run, they return a some type of value.</p>
<p>Clojure functions always return a value.</p>
<h2 id="function-arguments">Function arguments</h2>
<p>Many functions take in <em>arguments</em> which are everything else inside the enclosing parentheses after the function-.</p>
<pre><code class="lang-clojure">(<span class="hljs-name"><span class="hljs-builtin-name">str</span></span> <span class="hljs-string">&quot;Hello&quot;</span> <span class="hljs-string">&quot; &quot;</span> <span class="hljs-string">&quot;World!&quot;</span>)
</code></pre>
<p>In the above example, <code>str</code> takes 3 strings as arguments, <code>&quot;Hello&quot;</code>, <code>&quot; &quot;</code> and <code>&quot;World!&quot;</code> and returns the string &quot;Hello, World!&quot; .</p>
<pre><code class="lang-clojure">(<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> <span class="hljs-number">3</span> <span class="hljs-number">4</span>)
</code></pre>
<p><code>+</code> takes 3 and 4, adds them, and returns 7.</p>
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