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<!DOCTYPE html><html lang="en-US"><head><title>Programming 4. Loops</title><meta property="og:title" content="Programming 4. Loops"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] 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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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footer{bottom:21px}div#\:\$p>svg>foreignObject>section{--h1-color:#246;--header-footer-color:hsla(0,0%,40%,.75);--heading-strong-color:#48c;--paginate-color:#777;align-items:stretch;display:flex;flex-flow:column 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- var(--marpit-advanced-background-split, 50%))}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure>figcaption{position:absolute;border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;white-space:nowrap;width:1px}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=content],div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#\:\$p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div 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="14">
<h1 id="4-loops">4. Loops</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="2" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="loops">Loops?</h2>
<ul>
<li data-marpit-fragment="1">used for:
<ul>
<li data-marpit-fragment="2">repeating blocks of code</li>
<li data-marpit-fragment="3">looping through collections of data (more later...)</li>
<li data-marpit-fragment="4">running a program (more laterer...)</li>
</ul>
</li>
<li data-marpit-fragment="5">types of loops:
<ul>
<li data-marpit-fragment="6">While</li>
<li data-marpit-fragment="7">Do While</li>
<li data-marpit-fragment="8">For</li>
<li data-marpit-fragment="9">Foreach</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="3" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="while-loop"><code>while</code> loop</h2>
<ul>
<li data-marpit-fragment="1">while loop keeps executing its code block as long as the condition in its statement is true:<br />
*<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">int</span> count = <span class="hljs-number">0</span>;
<span class="hljs-keyword">while</span>(count < <span class="hljs-number">4</span>)
{
Debug.Log(count);
count++;
}
<span class="hljs-comment">// Outputs '0', '1', '2' and '3'</span>
</code></pre>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="4" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="do-while-loop"><code>do while</code> loop</h2>
<ul>
<li data-marpit-fragment="1">similar to while loop, but it executes the code block once <strong>even if the statement isn't true</strong></li>
<li data-marpit-fragment="2">try the following code: what happens if you change the initial value of <code>count</code> to 5?</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">int</span> count = <span class="hljs-number">0</span>;
<span class="hljs-keyword">do</span>
{
Debug.Log(count);
count++;
} <span class="hljs-keyword">while</span> (count < <span class="hljs-number">4</span>);
<span class="hljs-comment">// Outputs '0', '1', '2' and '3'</span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="5" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="for-loop"><code>for</code> loop</h2>
<ul>
<li data-marpit-fragment="1">for loops are used when the number of iterations is <strong>predefined</strong></li>
<li data-marpit-fragment="2">for loop is initialized in three steps:</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">for</span> (initialvalue;condition;increment)
{
doStuff();
}
</code></pre>
<ul>
<li data-marpit-fragment="3"><strong>The initial value</strong> is set <em>before the first</em> iteration</li>
<li data-marpit-fragment="4"><strong>The condition</strong> is checked <em>before each</em> iteration</li>
<li data-marpit-fragment="5"><strong>The increment</strong> is executed <em>after each</em> iteration</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h3 id="for-loop-example-1">For loop example 1</h3>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">for</span> (<span class="hljs-built_in">int</span> i = <span class="hljs-number">0</span>; i < <span class="hljs-number">4</span>; i++)
{
Debug.Log(<span class="hljs-string">"Current: "</span> + i);
}
<span class="hljs-comment">/* Outputs
Current: 0
Current: 1
Current: 2
Current: 3
*/</span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="7" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h3 id="for-loop-example-2">For loop example 2</h3>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">for</span> (<span class="hljs-built_in">int</span> i = <span class="hljs-number">4</span>; i > <span class="hljs-number">0</span>; i--)
{
Debug.Log(<span class="hljs-string">"Current: "</span> + i);
}
<span class="hljs-comment">/* Outputs
Current: 4
Current: 3
Current: 2
Current: 1
*/</span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="8" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="breaking-out-of-loops-break">Breaking out of loops: <code>break</code></h2>
<ul>
<li data-marpit-fragment="1">To stop the execution of a loop completely, use the <code>break</code> keyword:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">int</span> i = <span class="hljs-number">0</span>;
<span class="hljs-keyword">while</span> (<span class="hljs-literal">true</span>)
{
i++;
<span class="hljs-keyword">if</span> (i == <span class="hljs-number">3</span>)
<span class="hljs-keyword">break</span>;
}
<span class="hljs-comment">// i is now 3</span>
</code></pre>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="9" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="skip-ahead-continue">Skip ahead: <code>continue</code></h2>
<ul>
<li data-marpit-fragment="1">To skip the <strong>current</strong> iteration, use the <code>continue</code> keyword<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">int</span> i = <span class="hljs-number">0</span>;
<span class="hljs-keyword">while</span>(i < <span class="hljs-number">10</span>)
{
i++;
<span class="hljs-keyword">if</span> (i % <span class="hljs-number">2</span> == <span class="hljs-number">0</span>)
<span class="hljs-keyword">continue</span>;
Debug.Log(i);
}
<span class="hljs-comment">// Prints every odd number from 1 to 10</span>
</code></pre>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="10" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="nested-loops">Nested loops</h2>
<ul>
<li data-marpit-fragment="1">Loop inside a loop is often used for generating or going through two-dimensional data<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">int</span> rows = <span class="hljs-number">3</span>;
<span class="hljs-built_in">int</span> columns = <span class="hljs-number">4</span>;
<span class="hljs-keyword">for</span> (<span class="hljs-built_in">int</span> i = <span class="hljs-number">0</span>; i < rows; i++)
{
<span class="hljs-keyword">for</span> (<span class="hljs-built_in">int</span> j = <span class="hljs-number">0</span>; j < columns; j++)
{
Debug.Log(<span class="hljs-string">"("</span> + j.ToString() + <span class="hljs-string">","</span> + i.ToString() + <span class="hljs-string">")"</span>);
}
}
</code></pre>
<img src="imgs/2d-data.png" alt="2d data" /></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="11" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="14">
<h2 id="while-vs-for-when-to-use">While vs. for: when to use?</h2>
<ul>
<li data-marpit-fragment="1">for loops when the number of iterations is <strong>predefined</strong>
<ul>
<li data-marpit-fragment="2">when going through a list, for example.</li>
</ul>
</li>
<li data-marpit-fragment="3">while loops when we want to do something many times, but don't know when to stop</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-class="invert" data-background-color="#29366f" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="12" style="--paginate:true;--class:invert;--background-color:#29366f;--heading-divider:3;background-color:#29366f;background-image:none;" data-marpit-pagination-total="14">
<h2 id="exercise-1-loops-1">Exercise 1. Loops 1</h2>
<p>Create a loop whose number of iterations is set in an integer variable <code>numberOfEnemies</code>.</p>
<p>Run a loop that many times and write the message <code>Creating enemy 1</code>, <code>Creating enemy 2</code>, etc. to console.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-class="invert" data-background-color="#29366f" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--background-color:#29366f;--heading-divider:3;background-color:#29366f;background-image:none;" data-marpit-pagination-total="14">
<h2 id="exercise-2-loops-2">Exercise 2. Loops 2</h2>
<p>Suppose you have a given number of collectibles in a level.</p>
<p>You want a given percentage of them, say, 10%, to be shiny collectibles.</p>
<p>Create a loop that runs until this condition is met, and prints into console <code>Converted collectible 1 to shiny</code>.</p>
</section>
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<h2 id="exercise-3-field-of-cubes">Exercise 3. Field of Cubes</h2>
<p>Create a loop that instantiates a 8 * 8 field of cubes on a plane.</p>
<p><em><strong>Extra:</strong></em> If there's a cube already in the location, add an exception to NOT add a cube there!</p>
</section>
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