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<!DOCTYPE html><html lang="en-US"><head><title>Programming 3. Functions</title><meta property="og:title" content="Programming 3. 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
*/div#\:\$p>svg>foreignObject>section,div#\:\$p>svg>foreignObject>section 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class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="1" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="8">
<h1 id="3-functions">3. Functions</h1>
</section>
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<h2 id="scope">Scope</h2>
<ul>
<li data-marpit-fragment="1">Variables declared inside of blocks are called <strong>local</strong> variables
<ul>
<li data-marpit-fragment="2">they are only accessible inside of that block</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">int</span> a = <span class="hljs-number">0</span>;
<span class="hljs-keyword">if</span>(a < <span class="hljs-number">10</span>)
{
<span class="hljs-comment">// Variable 'b' is only accessible inside of this 'if' block</span>
<span class="hljs-built_in">int</span> b = <span class="hljs-number">1</span>;
b = <span class="hljs-number">2</span>; <span class="hljs-comment">// This works</span>
}
b = <span class="hljs-number">3</span>; <span class="hljs-comment">// This throws an error</span>
</code></pre>
</li>
</ul>
</section>
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<h2 id="introduction-to-functions">Introduction to functions</h2>
<ul>
<li data-marpit-fragment="1">To avoid repetition, blocks of code can be enclosed into named <em>functions</em></li>
<li data-marpit-fragment="2">Functions can have multiple arguments and a return type<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">PrintName</span>(<span class="hljs-params"><span class="hljs-built_in">string</span> argument1</span>)</span>
{
Debug.Log(<span class="hljs-string">"My name is "</span> + argument1);
}
</code></pre>
<ul>
<li data-marpit-fragment="3">This function takes in one <code>string</code> argument</li>
<li data-marpit-fragment="4">It returns nothing (thus, its return type is <code>void</code>)</li>
<li data-marpit-fragment="5">The function can be called like this:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#">PrintName(<span class="hljs-string">"Matti"</span>);
<span class="hljs-built_in">string</span> name2 = <span class="hljs-string">"Teppo"</span>;
PrintName(name2);
</code></pre>
</li>
</ul>
</li>
</ul>
</section>
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<h3 id="function-example">Function example</h3>
<ul>
<li data-marpit-fragment="1">Here's an example with two arguments and a non-void return value</li>
<li data-marpit-fragment="2">The <code>return</code> keyword tells what we return from the function<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-function"><span class="hljs-built_in">float</span> <span class="hljs-title">Pythagoras</span>(<span class="hljs-params"><span class="hljs-built_in">float</span> a, <span class="hljs-built_in">float</span> b</span>) <span class="hljs-comment">// a^2 + b^2 = c^2</span></span>
{
<span class="hljs-built_in">float</span> c = Mathf.Sqrt(Mathf.Pow(a,<span class="hljs-number">2</span>) + Mathf.Pow(b,<span class="hljs-number">2</span>));
<span class="hljs-keyword">return</span> c;
}
</code></pre>
</li>
<li data-marpit-fragment="3">The function is called like this:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">float</span> length = Pythagoras(<span class="hljs-number">3f</span>, <span class="hljs-number">4f</span>); <span class="hljs-comment">// now value of length is 5</span>
</code></pre>
</li>
<li data-marpit-fragment="4">The function definition can be further simplified...<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-function"><span class="hljs-built_in">float</span> <span class="hljs-title">Pythagoras</span>(<span class="hljs-params"><span class="hljs-built_in">float</span> a, <span class="hljs-built_in">float</span> b</span>) <span class="hljs-comment">// a^2 + b^2 = c^2</span></span>
{
<span class="hljs-keyword">return</span> Mathf.Sqrt(Mathf.Pow(a,<span class="hljs-number">2</span>) + Mathf.Pow(b,<span class="hljs-number">2</span>));
}
</code></pre>
</li>
</ul>
</section>
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<h2 id="note-about-functions">Note about functions</h2>
<ul>
<li data-marpit-fragment="1">Because C# is object-oriented, all functions are <em>methods</em> inside <em>classes</em></li>
<li data-marpit-fragment="2">We'll dive deeper into these topics in <a href="6-classes-methods">Chapter 6. Classes and Methods</a></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-footer="Not to be confused with actual [property setters](6-classes-methods#extra-properties-with-getters--setters)." data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--footer:Not to be confused with actual [property setters](6-classes-methods#extra-properties-with-getters--setters).;--heading-divider:3;" data-marpit-pagination-total="8">
<h2 id="setter-methods">Setter methods</h2>
<ul>
<li data-marpit-fragment="1">A common type of method in C# is a setter</li>
<li data-marpit-fragment="2">Named something like <code>SetVariableName</code></li>
<li data-marpit-fragment="3">Takes in a new value for the variable<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">SetName</span>(<span class="hljs-params"><span class="hljs-built_in">string</span> newName</span>)</span>
{
name = newName;
}
</code></pre>
</li>
<li data-marpit-fragment="4">If we change variable value with a setter method like this, we can easily track the changes by adding a <code>Debug.Log</code> call inside the method.</li>
</ul>
<footer>Not to be confused with actual <a href="6-classes-methods#extra-properties-with-getters--setters">property setters</a>.</footer>
</section>
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<h2 id="exercise-1-traffic-lights">Exercise 1: Traffic lights</h2>
<p>Create a script for displaying the state of a traffic light in the Unity console. We do it by creating a function called <code>SetColor</code> that takes in the color as a string argument.</p>
<ul>
<li data-marpit-fragment="1">
<p><img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/[email protected]/assets/svg/2b50.svg" data-marp-twemoji=""/> Display the current color in the console every frame (use <code>Update()</code>).</p>
</li>
<li data-marpit-fragment="2">
<p>For seconds 0-3 the color should be red, the seconds 4-5 should be yellow, and from that onwards green.</p>
</li>
<li data-marpit-fragment="3">
<p>So, after the first frame the console would read <code>The color is RED!</code>.</p>
</li>
<li data-marpit-fragment="4">
<p><em><strong>Hint:</strong></em> Use <code>Time.time</code> to check the current time!</p>
</li>
</ul>
</section>
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<h2 id="exercise-1-extras">Exercise 1 extras</h2>
<ul>
<li data-marpit-fragment="1">
<p><img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/[email protected]/assets/svg/2b50.svg" data-marp-twemoji=""/><img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/[email protected]/assets/svg/2b50.svg" data-marp-twemoji=""/> Print the color to console only when the light changes.</p>
</li>
<li data-marpit-fragment="2">
<p><img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/[email protected]/assets/svg/2b50.svg" data-marp-twemoji=""/><img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/[email protected]/assets/svg/2b50.svg" data-marp-twemoji=""/><img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/[email protected]/assets/svg/2b50.svg" data-marp-twemoji=""/> Create a 3d object. Change the color of its material as a function of time.</p>
<ul>
<li data-marpit-fragment="3"><strong>Spoiler:</strong><pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#">gameObject.GetComponent<Renderer>().material.color = Color.green;
</code></pre>
</li>
</ul>
</li>
</ul>
</section>
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