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<!DOCTYPE html><html lang="en-GB"><head><title>Best practices for programming</title><meta property="og:title" content="Best practices for programming"><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 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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
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:is(h3,marp-h3){font-size:1.1em}div#\:\$p>svg>foreignObject>section :is(h4,marp-h4){font-size:1.05em}div#\:\$p>svg>foreignObject>section :is(h5,marp-h5){font-size:1em}div#\:\$p>svg>foreignObject>section :is(h6,marp-h6){font-size:.9em}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1) strong,div#\:\$p>svg>foreignObject>section :is(h2,marp-h2) strong,div#\:\$p>svg>foreignObject>section :is(h3,marp-h3) strong,div#\:\$p>svg>foreignObject>section :is(h4,marp-h4) strong,div#\:\$p>svg>foreignObject>section :is(h5,marp-h5) strong,div#\:\$p>svg>foreignObject>section :is(h6,marp-h6) strong{color:var(--heading-strong-color);font-weight:inherit}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h2,marp-h2)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h3,marp-h3)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h4,marp-h4)::part(auto-scaling),div#\:\$p>svg>foreignObject>section 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:is(pre,marp-pre) :where(.hljs-type),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-variable.language_){color:var(--color-prettylights-syntax-keyword)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.class_),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.class_.inherited__),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.function_){color:var(--color-prettylights-syntax-entity)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-attr),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-attribute),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-literal),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-meta),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-number),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-operator),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-attr),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-class),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-id),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-variable){color:var(--color-prettylights-syntax-constant)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-meta .hljs-string),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-regexp),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-string){color:var(--color-prettylights-syntax-string)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-built_in),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-symbol){color:var(--color-prettylights-syntax-variable)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-code),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-comment),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-formula){color:var(--color-prettylights-syntax-comment)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-name),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-quote),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-pseudo),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-tag){color:var(--color-prettylights-syntax-entity-tag)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-subst){color:var(--color-prettylights-syntax-storage-modifier-import)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-section){color:var(--color-prettylights-syntax-markup-heading);font-weight:700}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-bullet){color:var(--color-prettylights-syntax-markup-list)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) 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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-GB" class="invert" data-marpit-pagination="1" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h1 id="best-practices-for-programming">Best practices for programming</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="2" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="good-programming">Good programming</h2>
<ul>
<li data-marpit-fragment="1">You don't want to just learn programming</li>
<li data-marpit-fragment="2">You want to learn how to program <em><strong>well</strong></em></li>
<li data-marpit-fragment="3">What is good code, then?
<ul>
<li data-marpit-fragment="4">Let's go through some alarming examples</li>
<li data-marpit-fragment="5"><mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.054ex;" xmlns="http://www.w3.org/2000/svg" width="2.262ex" height="1.242ex" role="img" focusable="false" viewBox="0 -525 1000 549"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="21D2" d="M580 514Q580 525 596 525Q601 525 604 525T609 525T613 524T615 523T617 520T619 517T622 512Q659 438 720 381T831 300T927 263Q944 258 944 250T935 239T898 228T840 204Q696 134 622 -12Q618 -21 615 -22T600 -24Q580 -24 580 -17Q580 -13 585 0Q620 69 671 123L681 133H70Q56 140 56 153Q56 168 72 173H725L735 181Q774 211 852 250Q851 251 834 259T789 283T735 319L725 327H72Q56 332 56 347Q56 360 70 367H681L671 377Q638 412 609 458T580 514Z"></path></g></g></g></svg></mjx-container> learn what ISN'T good code</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="11" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="3" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="why-make-code-good-when-bad-code-do-job">why make code good when bad code do job</h2>
<ul>
<li data-marpit-fragment="1">"I'll just hack this together quickly and move on"
<ul>
<li data-marpit-fragment="2">A dangerous sentiment that <em><strong>will</strong></em> cost sweat, tears and person-hours</li>
<li data-marpit-fragment="3">Every time I've thought this, I've either
<ul>
<li data-marpit-fragment="4">a) had to eventually code it better</li>
<li data-marpit-fragment="5">b) lost significant amount of time for deciphering later what the hell have I written</li>
</ul>
</li>
</ul>
</li>
<li data-marpit-fragment="6"><em>You always code for someone else</em>
<ul>
<li data-marpit-fragment="7">1 - The compiler</li>
<li data-marpit-fragment="8">2 - Your teammates</li>
<li data-marpit-fragment="9">3 - You in the future
<ul>
<li data-marpit-fragment="10">I can't stress this enough:</li>
<li data-marpit-fragment="11"><em>You in the future is a different person that you in the now.</em></li>
</ul>
</li>
</ul>
</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-GB" class="invert" data-marpit-pagination="4" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="the-importance-of-whitespace">The importance of whitespace</h2>
<ul>
<li data-marpit-fragment="1">The <em><strong>empty space</strong></em> & <em><strong>linebreaks</strong></em> have a huge impact on code readability</li>
<li data-marpit-fragment="2">Alarming example:</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"> <span class="hljs-keyword">if</span> (controller.MoveDirection != Vector3.zero)
{
controller.Move(controller.targetDirection, speed);
transform.rotation = Quaternion.LookRotation(controller.targetDirection);
}
<span class="hljs-keyword">if</span> (!controller.isGrounded()) {
state=State.InAir;
}
<span class="hljs-keyword">if</span> (jumpBuffer > <span class="hljs-number">0</span>)
{Jump();}
</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="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="5" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<ul>
<li data-marpit-fragment="1">Functionally, this is the same code, but <em><strong>much</strong></em> easier to read:</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"> <span class="hljs-keyword">if</span> (controller.MoveDirection != Vector3.zero)
{
controller.Move(controller.targetDirection, KoiranNopeus);
transform.rotation = Quaternion.LookRotation(controller.targetDirection);
}
<span class="hljs-keyword">if</span> (!controller.isGrounded())
{
state = State.InAir;
}
<span class="hljs-keyword">if</span> (jumpBuffer > <span class="hljs-number">0</span>)
{
Jump();
}
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h3 id="in-a-nutshell">In a nutshell...</h3>
<ul>
<li data-marpit-fragment="1">Indent only when introducing a new logical block (if, for loop, etc...)</li>
<li data-marpit-fragment="2">Choose which style you use (spacebar / tab, how many spaces wide...)
<ul>
<li data-marpit-fragment="3">...and <em><strong>stick to it</strong></em></li>
</ul>
</li>
<li data-marpit-fragment="4">Use <em><strong>one</strong></em> empty line if you need to separate two blocks of code if needed</li>
<li data-marpit-fragment="5">Make lines breathe: <code>a = b + c;</code>, not <code>a=b+c;</code></li>
<li data-marpit-fragment="6">Choose how you like to line <code>{</code> braces:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">if</span> (<span class="hljs-literal">true</span>) {
...
}
</code></pre>
or<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">if</span> (<span class="hljs-literal">true</span>)
{
...
}
</code></pre>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-footer="Some programmers prefer line widths of 100 or even 80 characters." data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="7" style="--paginate:true;--class:invert;--footer:Some programmers prefer line widths of 100 or even 80 characters.;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="line-width">Line width</h2>
<ul>
<li data-marpit-fragment="1">If your lines are getting too wide (over ~120 characters), split the code to multiple lines</li>
<li data-marpit-fragment="2">As the lines get shorter, the code gets more readable</li>
<li data-marpit-fragment="3">If you just do one thing per line, it's much easier to follow along</li>
<li data-marpit-fragment="4">Example: refactor<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">if</span> (controller.MoveDirection != Vector3.zero && !controller.isGrounded() && jumpBuffer > <span class="hljs-number">0</span>)
</code></pre>
to<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">if</span> (controller.MoveDirection != Vector3.zero
&& !controller.isGrounded()
&& jumpBuffer > <span class="hljs-number">0</span>)
</code></pre>
</li>
</ul>
<footer>Some programmers prefer line widths of 100 or even 80 characters.</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="8" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h3 id="but-we-can-go-further">But we can go further</h3>
<ul>
<li data-marpit-fragment="1">Do not try to minimize code size</li>
<li data-marpit-fragment="2">Rather try to maximize <em>debuggability</em></li>
<li data-marpit-fragment="3">This can usually happen by introducing "redundant" variables. Consider<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">if</span> (controller.MoveDirection != Vector3.zero
&& !controller.isGrounded()
&& jumpBuffer > <span class="hljs-number">0</span>)
</code></pre>
</li>
<li data-marpit-fragment="4">vs.<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">const</span> <span class="hljs-built_in">bool</span> notMoving = controller.MoveDirection != Vector3.zero;
<span class="hljs-keyword">const</span> <span class="hljs-built_in">bool</span> onAir = !controller.isGrounded();
<span class="hljs-keyword">const</span> <span class="hljs-built_in">bool</span> canJump = jumpBuffer > <span class="hljs-number">0</span>;
<span class="hljs-keyword">if</span> (notMoving && onAir && canJump)
</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="4" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="9" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="commenting-just-enough">Commenting just enough</h2>
<ul>
<li data-marpit-fragment="1">It can be difficult to decide what's the correct amount of commenting</li>
<li data-marpit-fragment="2">Comments should explain what the code does</li>
<li data-marpit-fragment="3">...if and only if the code does not already explain that!<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-comment">// set player state to grounded when player touches the ground</span>
<span class="hljs-keyword">if</span> (collider.tag == <span class="hljs-string">"Ground"</span>)
{
<span class="hljs-keyword">const</span> state = State.Grounded;
}
</code></pre>
</li>
<li data-marpit-fragment="4">The comment above provides almost zero new information</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="2" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="10" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h3 id="commenting-with-function-calls">Commenting with function calls</h3>
<ul>
<li data-marpit-fragment="1">In some cases, a better way to explain the code is to wrap it into a small helper function<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-comment">// give a random rotation between 0 and 180</span>
<span class="hljs-keyword">const</span> rotation = Quaternion.Euler(<span class="hljs-number">0</span>, Random.Range(<span class="hljs-number">0</span>, <span class="hljs-number">180</span>), <span class="hljs-number">0</span>);
</code></pre>
</li>
<li data-marpit-fragment="2">Instead, what about this:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"> <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> Quaternion <span class="hljs-title">RandomRotationRange</span>(<span class="hljs-params"><span class="hljs-built_in">float</span> angle1, <span class="hljs-built_in">float</span> angle2</span>)</span>
{
<span class="hljs-keyword">return</span> Quaternion.Euler(<span class="hljs-number">0</span>, Random.Range(angle1, angle2), <span class="hljs-number">0</span>);
}
</code></pre>
a) it gives the same information you wanted to give<br />
b) it's now more reusable<br />
c) it hides the implementation, so when we read the code, we can focus on the WHAT instead of the HOW</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="9" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="11" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="naming-variables">Naming variables</h2>
<ul>
<li data-marpit-fragment="1"><a href="https://en.wikipedia.org/wiki/Naming_convention_(programming)">Wikipedia: Naming convention</a></li>
<li data-marpit-fragment="2"><em>"There are two hard things in computer science: cache invalidation, naming things, and off-by-one errors."</em></li>
<li data-marpit-fragment="3">For real, naming is one of the hardest tasks in programming.</li>
<li data-marpit-fragment="4">It's all about communicating enough, but not too much</li>
<li data-marpit-fragment="5">First rule: Explain what the variable stores!
<ul>
<li data-marpit-fragment="6">a) <code>a = b * c;</code>
<ul>
<li data-marpit-fragment="7">I have no idea what this line is <em>really</em> doing</li>
</ul>
</li>
<li data-marpit-fragment="8">b) <code>weeklyPay = hoursWorked * hourlyPayRate;</code>
<ul>
<li data-marpit-fragment="9">That's more like it!</li>
</ul>
</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="12" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<ul>
<li data-marpit-fragment="1">How would you name a variable that stores what is the probability for player's attack to land?
<ul>
<li data-marpit-fragment="2"><code>pAttack</code>, <code>attackLandProbability</code>, <code>player1HitPercentage</code>...
<ul>
<li data-marpit-fragment="3">None of these are exceptionally good</li>
</ul>
</li>
<li data-marpit-fragment="4">Good variable names are always case-specific:
<ul>
<li data-marpit-fragment="5">Sometimes you can go too descriptive...
<ul>
<li data-marpit-fragment="6"><code>playerAttackToLandProbabilityAsPercentage</code></li>
</ul>
</li>
<li data-marpit-fragment="7">However! It's much more usual to go <em><strong>not descriptive enough</strong></em>
<ul>
<li data-marpit-fragment="8"><code>pAtk</code></li>
</ul>
</li>
<li data-marpit-fragment="9">The golden route is somewhere in the middle!</li>
</ul>
</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="get-rid-of-magic-numbers">Get rid of magic numbers!</h2>
<ul>
<li data-marpit-fragment="1">Consider this:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#">rotationsPerDay = rotationsPerSecond * <span class="hljs-number">60</span> * <span class="hljs-number">60</span> * <span class="hljs-number">24</span>;
</code></pre>
</li>
<li data-marpit-fragment="2">Vs. this:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#">secondsPerDay = <span class="hljs-number">60</span> * <span class="hljs-number">60</span> * <span class="hljs-number">24</span>;
rotationsPerDay = rotationsPerSecond * secondsPerDay;
</code></pre>
</li>
<li data-marpit-fragment="3">This might seem like stating the obvious, but we usually want to do this!
<ul>
<li data-marpit-fragment="4">What may seem obvious to you, might not be to the reader of the code</li>
<li data-marpit-fragment="5">...which will be you one day</li>
</ul>
</li>
</ul>
</section>
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<h2 id="write-what-you-mean">Write what you mean</h2>
<ul>
<li data-marpit-fragment="1">This concerns not only variable naming, but also how to generally use statements</li>
<li data-marpit-fragment="2">Do not leave anything implied - write what you mean <em><strong>explicitly</strong></em></li>
<li data-marpit-fragment="3">Let's have an innocious yet dangerous example:
<ul>
<li data-marpit-fragment="4">Consider a player character that has two states, <code>Jump</code> and <code>Idle</code>.</li>
<li data-marpit-fragment="5">We could play the animations as thus:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">if</span> (state == PlayerState.Jump)
{
JumpAnimation.Play();
} <span class="hljs-keyword">else</span> {
IdleAnimation.Play();
}
</code></pre>
</li>
<li data-marpit-fragment="6">However! What if the player gets a <code>Swim</code> state in the future?</li>
<li data-marpit-fragment="7">Now the <code>else</code> block has to be refactored!</li>
<li data-marpit-fragment="8">What if this implicit idea of "else equals idle" is present in multiple places?</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="15" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<ul>
<li data-marpit-fragment="1">State your intent!<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-keyword">if</span> (state == PlayerState.Jump)
{
JumpAnimation.Play();
}
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (state == PlayerState.Idle)
{
IdleAnimation.Play();
}
</code></pre>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="16" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="dangers-of-overgeneralization">Dangers of overgeneralization</h2>
<ul>
<li data-marpit-fragment="1">Sometimes you might think it's smart to account for possible future use cases</li>
<li data-marpit-fragment="2">This leads to unnecessary complexity: you have code that is there just IN CASE</li>
<li data-marpit-fragment="3">The problem is, you usually can't know beforehand what use cases are actually needed
<ul>
<li data-marpit-fragment="4">Actually, it's downright impossible to predict what structure is optimal for your use case</li>
<li data-marpit-fragment="5">After you have created the structure, you know what kind of structure you should have written</li>
</ul>
</li>
<li data-marpit-fragment="6">Write code that solves the problem you have, not some problem you might possibly have in the future!</li>
</ul>
</section>
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<h2 id="be-cohesive">Be cohesive!</h2>
<ul>
<li data-marpit-fragment="1">If you write one variable in a certain way, be sure to use that style for other variables as well</li>
<li data-marpit-fragment="2">Alarming example:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><span class="hljs-built_in">int</span> spr_smallhop = <span class="hljs-number">993</span>,
<span class="hljs-built_in">bool</span> drwOnAbove = <span class="hljs-literal">true</span>;
<span class="hljs-built_in">int</span>[] shinypals = [ <span class="hljs-number">1</span>, <span class="hljs-number">4</span>, <span class="hljs-number">2</span> ];
</code></pre>
<ul>
<li data-marpit-fragment="3">three different variables, three different casings
<ul>
<li data-marpit-fragment="4"><code>snake_case</code></li>
<li data-marpit-fragment="5"><code>camelCase</code></li>
<li data-marpit-fragment="6"><code>flatcase</code></li>
</ul>
</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-marpit-fragments="8" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="18" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="bad-structure">Bad structure</h2>
<ul>
<li data-marpit-fragment="1">When do you have bad <em>structure</em> in your code?</li>
<li data-marpit-fragment="2">Cases of <em>code smell</em>:
<ul>
<li data-marpit-fragment="3">When changing one thing in code, you have to change something completely unrelated to make it work.</li>
<li data-marpit-fragment="4">When writing/reading code, you have to jump between code files constantly.</li>
<li data-marpit-fragment="5">You need to reread lines of code again and again to understand what's going on</li>
<li data-marpit-fragment="6">Everything breaks if the code isn't used in a very specific manner</li>
</ul>
</li>
<li data-marpit-fragment="7"><a href="https://en.wikipedia.org/wiki/Anti-pattern">Wikipedia: Anti-pattern</a></li>
<li data-marpit-fragment="8"><a href="https://en.wikipedia.org/wiki/Code_smell">Wikipedia: Code smell</a></li>
</ul>
</section>
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<h3 id="how-does-bad-structure-happen">How does bad structure happen?</h3>
<ul>
<li data-marpit-fragment="1">No one wants to deliberately write bad code
<ul>
<li data-marpit-fragment="2">The "I'll just hack this quickly" mentality can sometimes be to blame</li>
<li data-marpit-fragment="3">also, the lack of concern for readability</li>
</ul>
</li>
<li data-marpit-fragment="4">...but more often, bad structure happens over a longer period of time
<ul>
<li data-marpit-fragment="5">First, you code a feature X</li>
<li data-marpit-fragment="6">You extend the code with a feature Y</li>
<li data-marpit-fragment="7">then accommodate for a use case Z</li>
<li data-marpit-fragment="8">Then you notice X isn't really needed any more</li>
<li data-marpit-fragment="9">Too late, structure bad!</li>
</ul>
</li>
<li data-marpit-fragment="10">Sometimes the only way to fix this is to refactor the whole structure from scratch
<ul>
<li data-marpit-fragment="11">Very often the only way to know how you <em><strong>should</strong></em> have done it is to do it wrong first!</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="20" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="some-principles-for-better-structure">Some principles for better structure</h2>
<ul>
<li data-marpit-fragment="1"><a href="https://en.wikipedia.org/wiki/Separation_of_concerns">Separation of concerns</a>:
<ul>
<li data-marpit-fragment="2">One part of code (function, class...) handles only one thing</li>
</ul>
</li>
<li data-marpit-fragment="3"><a href="https://htmx.org/essays/locality-of-behaviour/">Locality of behaviour</a>
<ul>
<li data-marpit-fragment="4">You can understand a concept by looking at a small portion of source code</li>
</ul>
</li>
<li data-marpit-fragment="5"><a href="https://en.wikipedia.org/wiki/Don%27t_repeat_yourself">DRY: Don't repeat yourself</a>
<ul>
<li data-marpit-fragment="6">If you write a duplicate of previously-written ~10 lines of code with minimal changes, you might have a problem</li>
<li data-marpit-fragment="7">Better idea to wrap it into a function</li>
</ul>
</li>
<li data-marpit-fragment="8"><a href="https://en.wikipedia.org/wiki/KISS_principle">KISS: Keep it simple, stupid</a>
<ul>
<li data-marpit-fragment="9">Complexity bad</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="21" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h3 id="but-beware">But beware!</h3>
<ul>
<li data-marpit-fragment="1">Even following the principles shown can lead to bad code</li>
<li data-marpit-fragment="2">An experienced programmer can decide for themselves, when they should use them</li>
<li data-marpit-fragment="3">For example, creating two almost identical functions than creating a single function that covers two almost identical cases might sometimes result in much easier-to-read code
<ul>
<li data-marpit-fragment="4">It's yours to decide when that "sometimes" holds true</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="22" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h1 id="conclusions">Conclusions</h1>
</section>
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<h2 id="what-makes-code-good">What makes code good?</h2>
<ul>
<li data-marpit-fragment="1">Good code is...
<ul>
<li data-marpit-fragment="2">readable</li>
<li data-marpit-fragment="3">pretty</li>
<li data-marpit-fragment="4">self-consistent</li>
<li data-marpit-fragment="5">self-explanatory</li>
<li data-marpit-fragment="6">well-contained</li>
<li data-marpit-fragment="7">reusable (to some extent)</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="24" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-background-color="#5d275d" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="24" style="--paginate:true;--class:invert;--background-color:#5d275d;--heading-divider:3;background-color:#5d275d;background-image:none;" data-marpit-pagination-total="25">
<h3 id="extra-linters">Extra: Linters</h3>
<ul>
<li data-marpit-fragment="1">"You can use <a href="https://en.wikipedia.org/wiki/Lint_(software)">linters</a> to format code automatically</li>
<li data-marpit-fragment="2"><a href="https://johnnyreilly.com/eslint-your-csharp-in-vs-code-with-roslyn-analyzers">Here's</a> a guide to C# formatting with ESLint, a popular linter</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-GB" class="invert" data-marpit-pagination="25" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="25">
<h2 id="reading">Reading</h2>
<ul>
<li data-marpit-fragment="1"><a href="https://grugbrain.dev/">The Grug Brained Developer: A layman's guide to thinking like the self-aware smol brained</a></li>
</ul>
</section>
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