update

_quarto.yml

@@ -21,6 +21,10 @@ book:
     - cw006positive_sum.qmd
     - cw007reversedstrings.qmd
     - cw008bool_to_word.qmd
+    - cw009number_to_string.qmd
+    - cw010opposite.qmd
+    - cw011removeChar.qmd
+    - cw012square_sum.qmd
     
 
 bibliography: references.bib

cw001evenodd.html

@@ -197,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -273,31 +285,31 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">even_or_odd</span>(<span class="dv">1</span>), <span class="st">"Odd"</span>)</span>
 <span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🥳</code></pre>
+<pre><code>Test passed 😀</code></pre>
 </div>
 <div class="sourceCode cell-code" id="cb6"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">'even_or_odd(2) returns "Even"'</span>, {</span>
 <span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">even_or_odd</span>(<span class="dv">2</span>), <span class="st">"Even"</span>)</span>
 <span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🥳</code></pre>
+<pre><code>Test passed 🎊</code></pre>
 </div>
 <div class="sourceCode cell-code" id="cb8"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">'even_or_odd(0) returns "Even"'</span>, {</span>
 <span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">even_or_odd</span>(<span class="dv">0</span>), <span class="st">"Even"</span>)</span>
 <span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🥇</code></pre>
+<pre><code>Test passed 🎉</code></pre>
 </div>
 <div class="sourceCode cell-code" id="cb10"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">'even_or_odd(-1) returns "Odd"'</span>, {</span>
 <span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">even_or_odd</span>(<span class="sc">-</span><span class="dv">1</span>), <span class="st">"Odd"</span>)</span>
 <span id="cb10-3"><a href="#cb10-3" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 😸</code></pre>
+<pre><code>Test passed 🌈</code></pre>
 </div>
 <div class="sourceCode cell-code" id="cb12"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">'even_or_odd(-2) returns "Even"'</span>, {</span>
 <span id="cb12-2"><a href="#cb12-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">even_or_odd</span>(<span class="sc">-</span><span class="dv">2</span>), <span class="st">"Even"</span>)</span>
 <span id="cb12-3"><a href="#cb12-3" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🥳</code></pre>
+<pre><code>Test passed 🎉</code></pre>
 </div>
 </div>
 </section>

cw002multiply.html

@@ -197,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -278,7 +290,7 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <span id="cb4-9"><a href="#cb4-9" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">mul</span>(a, <span class="fu">mul</span>(b, c)), a <span class="sc">*</span> b <span class="sc">*</span> c)</span>
 <span id="cb4-10"><a href="#cb4-10" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 😸</code></pre>
+<pre><code>Test passed 🥇</code></pre>
 </div>
 </div>
 </section>

cw003countsheep.html

@@ -197,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -281,7 +293,7 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">countSheep</span>(<span class="dv">3</span>), <span class="st">"1 sheep...2 sheep...3 sheep..."</span>)</span>
 <span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🥇</code></pre>
+<pre><code>Test passed 🎊</code></pre>
 </div>
 </div>
 </section>

cw004reducegrow.html

@@ -197,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -275,7 +287,7 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <span id="cb4-5"><a href="#cb4-5" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">grow</span>(<span class="fu">c</span>(<span class="dv">2</span>, <span class="dv">2</span>, <span class="dv">2</span>, <span class="dv">2</span>, <span class="dv">2</span>, <span class="dv">2</span>)), <span class="dv">64</span>)</span>
 <span id="cb4-6"><a href="#cb4-6" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 😸</code></pre>
+<pre><code>Test passed 🥳</code></pre>
 </div>
 </div>
 </section>

cw005make_negative.html

@@ -197,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -278,7 +290,7 @@ The number can be negative already, in which case no change is required. Zero (0
 <span id="cb4-8"><a href="#cb4-8" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">make_negative</span>(<span class="sc">-</span><span class="dv">1</span>), <span class="sc">-</span><span class="dv">1</span>)</span>
 <span id="cb4-9"><a href="#cb4-9" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 😀</code></pre>
+<pre><code>Test passed 😸</code></pre>
 </div>
 </div>
 </section>

cw006positive_sum.html

@@ -197,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -288,7 +300,7 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <span id="cb4-8"><a href="#cb4-8" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">positive_sum</span>(<span class="fu">c</span>(<span class="sc">-</span><span class="dv">1</span>,<span class="sc">-</span><span class="dv">2</span>,<span class="sc">-</span><span class="dv">3</span>,<span class="sc">-</span><span class="dv">4</span>,<span class="sc">-</span><span class="dv">5</span>)),<span class="dv">0</span>)</span>
 <span id="cb4-9"><a href="#cb4-9" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🎉</code></pre>
+<pre><code>Test passed 🥳</code></pre>
 </div>
 </div>
 </section>

cw007reversedstrings.html

@@ -197,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -276,7 +288,7 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <span id="cb4-7"><a href="#cb4-7" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">solution</span>(<span class="st">'h'</span>), <span class="st">'h'</span>)</span>
 <span id="cb4-8"><a href="#cb4-8" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🥇</code></pre>
+<pre><code>Test passed 😸</code></pre>
 </div>
 </div>
 </section>

cw008bool_to_word.html

@@ -64,6 +64,7 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <script src="site_libs/quarto-search/fuse.min.js"></script>
 <script src="site_libs/quarto-search/quarto-search.js"></script>
 <meta name="quarto:offset" content="./">
+<link href="./cw009number_to_string.html" rel="next">
 <link href="./cw007reversedstrings.html" rel="prev">
 <link href="./logo.png" rel="icon" type="image/png">
 <script src="site_libs/quarto-html/quarto.js"></script>
@@ -196,6 +197,18 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link active">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
 </li>
     </ul>
     </div>
@@ -264,7 +277,7 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">bool_to_word</span>(<span class="cn">FALSE</span>), <span class="st">'No'</span>)</span>
 <span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 <div class="cell-output cell-output-stdout">
-<pre><code>Test passed 🎊</code></pre>
+<pre><code>Test passed 🥳</code></pre>
 </div>
 </div>
 </section>
@@ -521,6 +534,9 @@ window.document.addEventListener("DOMContentLoaded", function (event) {
       </a>          
   </div>
   <div class="nav-page nav-page-next">
+      <a href="./cw009number_to_string.html" class="pagination-link">
+        <span class="nav-page-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span> <i class="bi bi-arrow-right-short"></i>
+      </a>
   </div>
 </nav>
 </div> <!-- /content -->

cw009number_to_string.html

@@ -0,0 +1,555 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
+
+<meta charset="utf-8">
+<meta name="generator" content="quarto-1.3.433">
+
+<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
+
+
+<title>Codewars Challenge 2024 Menggunakan R dan RStudio - 9&nbsp; Convert a Number to a String!</title>
+<style>
+code{white-space: pre-wrap;}
+span.smallcaps{font-variant: small-caps;}
+div.columns{display: flex; gap: min(4vw, 1.5em);}
+div.column{flex: auto; overflow-x: auto;}
+div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
+ul.task-list{list-style: none;}
+ul.task-list li input[type="checkbox"] {
+  width: 0.8em;
+  margin: 0 0.8em 0.2em -1em; /* quarto-specific, see https://github.com/quarto-dev/quarto-cli/issues/4556 */ 
+  vertical-align: middle;
+}
+/* CSS for syntax highlighting */
+pre > code.sourceCode { white-space: pre; position: relative; }
+pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
+pre > code.sourceCode > span:empty { height: 1.2em; }
+.sourceCode { overflow: visible; }
+code.sourceCode > span { color: inherit; text-decoration: inherit; }
+div.sourceCode { margin: 1em 0; }
+pre.sourceCode { margin: 0; }
+@media screen {
+div.sourceCode { overflow: auto; }
+}
+@media print {
+pre > code.sourceCode { white-space: pre-wrap; }
+pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
+}
+pre.numberSource code
+  { counter-reset: source-line 0; }
+pre.numberSource code > span
+  { position: relative; left: -4em; counter-increment: source-line; }
+pre.numberSource code > span > a:first-child::before
+  { content: counter(source-line);
+    position: relative; left: -1em; text-align: right; vertical-align: baseline;
+    border: none; display: inline-block;
+    -webkit-touch-callout: none; -webkit-user-select: none;
+    -khtml-user-select: none; -moz-user-select: none;
+    -ms-user-select: none; user-select: none;
+    padding: 0 4px; width: 4em;
+  }
+pre.numberSource { margin-left: 3em;  padding-left: 4px; }
+div.sourceCode
+  {   }
+@media screen {
+pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
+}
+</style>
+
+
+<script src="site_libs/quarto-nav/quarto-nav.js"></script>
+<script src="site_libs/quarto-nav/headroom.min.js"></script>
+<script src="site_libs/clipboard/clipboard.min.js"></script>
+<script src="site_libs/quarto-search/autocomplete.umd.js"></script>
+<script src="site_libs/quarto-search/fuse.min.js"></script>
+<script src="site_libs/quarto-search/quarto-search.js"></script>
+<meta name="quarto:offset" content="./">
+<link href="./cw010opposite.html" rel="next">
+<link href="./cw008bool_to_word.html" rel="prev">
+<link href="./logo.png" rel="icon" type="image/png">
+<script src="site_libs/quarto-html/quarto.js"></script>
+<script src="site_libs/quarto-html/popper.min.js"></script>
+<script src="site_libs/quarto-html/tippy.umd.min.js"></script>
+<script src="site_libs/quarto-html/anchor.min.js"></script>
+<link href="site_libs/quarto-html/tippy.css" rel="stylesheet">
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+   
+  <ul>
+  <li><a href="#instruction" id="toc-instruction" class="nav-link active" data-scroll-target="#instruction"><span class="header-section-number">9.1</span> Instruction</a></li>
+  <li><a href="#youtube-video" id="toc-youtube-video" class="nav-link" data-scroll-target="#youtube-video"><span class="header-section-number">9.2</span> YouTube Video</a></li>
+  <li><a href="#solution-code" id="toc-solution-code" class="nav-link" data-scroll-target="#solution-code"><span class="header-section-number">9.3</span> Solution Code</a></li>
+  <li><a href="#test" id="toc-test" class="nav-link" data-scroll-target="#test"><span class="header-section-number">9.4</span> Test</a></li>
+  <li><a href="#supported-by" id="toc-supported-by" class="nav-link" data-scroll-target="#supported-by"><span class="header-section-number">9.5</span> Supported by</a></li>
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+<h1 class="title"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></h1>
+</div>
+
+
+
+<div class="quarto-title-meta">
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+    
+  
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+
+<p><span class="badge rounded-pill quarto-badge " style="background-color: grey;">8kyu</span> Tantangan #9/366 - 23 Feb 2024</p>
+<p><a href="https://www.codewars.com/kata/5265326f5fda8eb1160004c8/train/r" class="uri">https://www.codewars.com/kata/5265326f5fda8eb1160004c8/train/r</a></p>
+<section id="instruction" class="level2" data-number="9.1">
+<h2 data-number="9.1" class="anchored" data-anchor-id="instruction"><span class="header-section-number">9.1</span> Instruction</h2>
+<p>We need a function that can transform a number (integer) into a string.</p>
+<p>What ways of achieving this do you know?</p>
+<p>Examples (input –&gt; output):</p>
+<pre><code>123  --&gt; "123"
+999  --&gt; "999"
+-100 --&gt; "-100"</code></pre>
+</section>
+<section id="youtube-video" class="level2" data-number="9.2">
+<h2 data-number="9.2" class="anchored" data-anchor-id="youtube-video"><span class="header-section-number">9.2</span> YouTube Video</h2>
+<div class="quarto-video ratio ratio-16x9"><iframe data-external="1" src="https://www.youtube.com/embed/L8aczEhqymk?si=DSx84acpNvbkucrK" title="" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></div>
+</section>
+<section id="solution-code" class="level2" data-number="9.3">
+<h2 data-number="9.3" class="anchored" data-anchor-id="solution-code"><span class="header-section-number">9.3</span> Solution Code</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>number_to_string <span class="ot">&lt;-</span> <span class="cf">function</span>(n) {</span>
+<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">as.character</span>(n)</span>
+<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>number_to_string <span class="ot">&lt;-</span> as.character</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+</section>
+<section id="test" class="level2" data-number="9.4">
+<h2 data-number="9.4" class="anchored" data-anchor-id="test"><span class="header-section-number">9.4</span> Test</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(testthat)</span>
+<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a></span>
+<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">"fixed tests"</span>, {</span>
+<span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">number_to_string</span>(<span class="dv">67</span>), <span class="st">'67'</span>)</span>
+<span id="cb4-5"><a href="#cb4-5" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">number_to_string</span>(<span class="dv">79585</span>), <span class="st">'79585'</span>)</span>
+<span id="cb4-6"><a href="#cb4-6" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">number_to_string</span>(<span class="dv">3</span>), <span class="st">'3'</span>)</span>
+<span id="cb4-7"><a href="#cb4-7" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">number_to_string</span>(<span class="sc">-</span><span class="dv">1</span>), <span class="st">'-1'</span>)</span>
+<span id="cb4-8"><a href="#cb4-8" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="cell-output cell-output-stdout">
+<pre><code>Test passed 🥇</code></pre>
+</div>
+</div>
+</section>
+<section id="supported-by" class="level2" data-number="9.5">
+<h2 data-number="9.5" class="anchored" data-anchor-id="supported-by"><span class="header-section-number">9.5</span> Supported by</h2>
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+<figure class="figure">
+<p><a href="https://www.starcore.co"><img src="new_starcore_logo.png" class="img-fluid figure-img"></a></p>
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+        <i class="bi bi-arrow-left-short"></i> <span class="nav-page-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span>
+      </a>          
+  </div>
+  <div class="nav-page nav-page-next">
+      <a href="./cw010opposite.html" class="pagination-link">
+        <span class="nav-page-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span> <i class="bi bi-arrow-right-short"></i>
+      </a>
+  </div>
+</nav>
+</div> <!-- /content -->
+
+
+
+</body></html>

cw010opposite.html

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+code.sourceCode > span { color: inherit; text-decoration: inherit; }
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+pre.sourceCode { margin: 0; }
+@media screen {
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+pre > code.sourceCode { white-space: pre-wrap; }
+pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
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+  { counter-reset: source-line 0; }
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+  { position: relative; left: -4em; counter-increment: source-line; }
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+  { content: counter(source-line);
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+  }
+pre.numberSource { margin-left: 3em;  padding-left: 4px; }
+div.sourceCode
+  {   }
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+pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
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+        <div class="sidebar-tools-main">
+    <a href="https://huggingface.co/spaces/aephidayatuloh/codewars2024/tree/main" rel="" title="Source Code" class="quarto-navigation-tool px-1" aria-label="Source Code"><i class="bi bi-git"></i></a>
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+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./index.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text">Pengantar</span></a>
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+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw001evenodd.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">1</span>&nbsp; <span class="chapter-title">Even or Odd</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw002multiply.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">2</span>&nbsp; <span class="chapter-title">Multiply</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw003countsheep.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">3</span>&nbsp; <span class="chapter-title">If you can’t sleep, just count sheep!!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw004reducegrow.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">4</span>&nbsp; <span class="chapter-title">Beginner - Reduce but Grow</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw005make_negative.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">5</span>&nbsp; <span class="chapter-title">Return Negative</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw006positive_sum.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">6</span>&nbsp; <span class="chapter-title">Sum of positive</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw007reversedstrings.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">7</span>&nbsp; <span class="chapter-title">Reversed Strings</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link active">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw011removeChar.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">11</span>&nbsp; <span class="chapter-title">Remove First and Last Character</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw012square_sum.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">12</span>&nbsp; <span class="chapter-title">Square(n) Sum</span></span></a>
+  </div>
+</li>
+    </ul>
+    </div>
+</nav>
+<div id="quarto-sidebar-glass" data-bs-toggle="collapse" data-bs-target="#quarto-sidebar,#quarto-sidebar-glass"></div>
+<!-- margin-sidebar -->
+    <div id="quarto-margin-sidebar" class="sidebar margin-sidebar">
+        <nav id="TOC" role="doc-toc" class="toc-active">
+    <h2 id="toc-title">Table of contents</h2>
+   
+  <ul>
+  <li><a href="#instruction" id="toc-instruction" class="nav-link active" data-scroll-target="#instruction"><span class="header-section-number">10.1</span> Instruction</a></li>
+  <li><a href="#youtube-video" id="toc-youtube-video" class="nav-link" data-scroll-target="#youtube-video"><span class="header-section-number">10.2</span> YouTube Video</a></li>
+  <li><a href="#solution-code" id="toc-solution-code" class="nav-link" data-scroll-target="#solution-code"><span class="header-section-number">10.3</span> Solution Code</a></li>
+  <li><a href="#test" id="toc-test" class="nav-link" data-scroll-target="#test"><span class="header-section-number">10.4</span> Test</a></li>
+  <li><a href="#supported-by" id="toc-supported-by" class="nav-link" data-scroll-target="#supported-by"><span class="header-section-number">10.5</span> Supported by</a></li>
+  </ul>
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+<main class="content" id="quarto-document-content">
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+<header id="title-block-header" class="quarto-title-block default">
+<div class="quarto-title">
+<h1 class="title"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></h1>
+</div>
+
+
+
+<div class="quarto-title-meta">
+
+    
+  
+    
+  </div>
+  
+
+</header>
+
+<p><span class="badge rounded-pill quarto-badge " style="background-color: grey;">8kyu</span> Tantangan #10/366 - 24 Feb 2024</p>
+<p><a href="https://www.codewars.com/kata/56dec885c54a926dcd001095/train/r" class="uri">https://www.codewars.com/kata/56dec885c54a926dcd001095/train/r</a></p>
+<section id="instruction" class="level2" data-number="10.1">
+<h2 data-number="10.1" class="anchored" data-anchor-id="instruction"><span class="header-section-number">10.1</span> Instruction</h2>
+<p>Very simple, given a number (integer / decimal / both depending on the language), find its opposite (additive inverse).</p>
+<p>Examples:</p>
+<pre><code>1: -1
+14: -14
+-34: 34</code></pre>
+</section>
+<section id="youtube-video" class="level2" data-number="10.2">
+<h2 data-number="10.2" class="anchored" data-anchor-id="youtube-video"><span class="header-section-number">10.2</span> YouTube Video</h2>
+<div class="quarto-video ratio ratio-16x9"><iframe data-external="1" src="https://www.youtube.com/embed/L8aczEhqymk?si=DSx84acpNvbkucrK" title="" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></div>
+</section>
+<section id="solution-code" class="level2" data-number="10.3">
+<h2 data-number="10.3" class="anchored" data-anchor-id="solution-code"><span class="header-section-number">10.3</span> Solution Code</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>opposite <span class="ot">&lt;-</span> <span class="cf">function</span>(number){</span>
+<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>  <span class="sc">-</span><span class="dv">1</span><span class="sc">*</span>number</span>
+<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>opposite <span class="ot">&lt;-</span> <span class="cf">function</span>(number)<span class="sc">-</span>number</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+</section>
+<section id="test" class="level2" data-number="10.4">
+<h2 data-number="10.4" class="anchored" data-anchor-id="test"><span class="header-section-number">10.4</span> Test</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(testthat)</span>
+<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a></span>
+<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">"the opposite of positive 1 is negative 1"</span>, {</span>
+<span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">opposite</span>(<span class="dv">1</span>), <span class="sc">-</span><span class="dv">1</span>)</span>
+<span id="cb4-5"><a href="#cb4-5" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="cell-output cell-output-stdout">
+<pre><code>Test passed 🥇</code></pre>
+</div>
+<div class="sourceCode cell-code" id="cb6"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">"the opposite of 0 is 0"</span>, {</span>
+<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">opposite</span>(<span class="dv">0</span>), <span class="dv">0</span>)</span>
+<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="cell-output cell-output-stdout">
+<pre><code>Test passed 🎊</code></pre>
+</div>
+<div class="sourceCode cell-code" id="cb8"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">"the opposite of positive 3.14 is negative 3.14"</span>, {</span>
+<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">opposite</span>(<span class="fl">3.14</span>), <span class="sc">-</span><span class="fl">3.14</span>)</span>
+<span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="cell-output cell-output-stdout">
+<pre><code>Test passed 🎉</code></pre>
+</div>
+<div class="sourceCode cell-code" id="cb10"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">"the opposite of negative 400.2 is positive 400.2"</span>, {</span>
+<span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">opposite</span>(<span class="sc">-</span><span class="fl">400.2</span>), <span class="fl">400.2</span>)</span>
+<span id="cb10-3"><a href="#cb10-3" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="cell-output cell-output-stdout">
+<pre><code>Test passed 🥳</code></pre>
+</div>
+</div>
+</section>
+<section id="supported-by" class="level2" data-number="10.5">
+<h2 data-number="10.5" class="anchored" data-anchor-id="supported-by"><span class="header-section-number">10.5</span> Supported by</h2>
+<div class="quarto-figure quarto-figure-center">
+<figure class="figure">
+<p><a href="https://www.starcore.co"><img src="new_starcore_logo.png" class="img-fluid figure-img"></a></p>
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cw011removeChar.html

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+  {   }
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+pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
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+ <span class="menu-text">Pengantar</span></a>
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+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw001evenodd.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">1</span>&nbsp; <span class="chapter-title">Even or Odd</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw002multiply.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">2</span>&nbsp; <span class="chapter-title">Multiply</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw003countsheep.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">3</span>&nbsp; <span class="chapter-title">If you can’t sleep, just count sheep!!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw004reducegrow.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">4</span>&nbsp; <span class="chapter-title">Beginner - Reduce but Grow</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw005make_negative.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">5</span>&nbsp; <span class="chapter-title">Return Negative</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw006positive_sum.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">6</span>&nbsp; <span class="chapter-title">Sum of positive</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw007reversedstrings.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">7</span>&nbsp; <span class="chapter-title">Reversed Strings</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
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+  <a href="./cw011removeChar.html" class="sidebar-item-text sidebar-link active">
+ <span class="menu-text"><span class="chapter-number">11</span>&nbsp; <span class="chapter-title">Remove First and Last Character</span></span></a>
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+  <a href="./cw012square_sum.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">12</span>&nbsp; <span class="chapter-title">Remove First and Last Character</span></span></a>
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+        <nav id="TOC" role="doc-toc" class="toc-active">
+    <h2 id="toc-title">Table of contents</h2>
+   
+  <ul>
+  <li><a href="#instruction" id="toc-instruction" class="nav-link active" data-scroll-target="#instruction"><span class="header-section-number">11.1</span> Instruction</a></li>
+  <li><a href="#youtube-video" id="toc-youtube-video" class="nav-link" data-scroll-target="#youtube-video"><span class="header-section-number">11.2</span> YouTube Video</a></li>
+  <li><a href="#solution-code" id="toc-solution-code" class="nav-link" data-scroll-target="#solution-code"><span class="header-section-number">11.3</span> Solution Code</a></li>
+  <li><a href="#test" id="toc-test" class="nav-link" data-scroll-target="#test"><span class="header-section-number">11.4</span> Test</a></li>
+  <li><a href="#supported-by" id="toc-supported-by" class="nav-link" data-scroll-target="#supported-by"><span class="header-section-number">11.5</span> Supported by</a></li>
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+<header id="title-block-header" class="quarto-title-block default">
+<div class="quarto-title">
+<h1 class="title"><span class="chapter-number">11</span>&nbsp; <span class="chapter-title">Remove First and Last Character</span></h1>
+</div>
+
+
+
+<div class="quarto-title-meta">
+
+    
+  
+    
+  </div>
+  
+
+</header>
+
+<p><span class="badge rounded-pill quarto-badge " style="background-color: grey;">8kyu</span> Tantangan #11/366 - 25 Feb 2024</p>
+<p><a href="https://www.codewars.com/kata/56bc28ad5bdaeb48760009b0/train/r" class="uri">https://www.codewars.com/kata/56bc28ad5bdaeb48760009b0/train/r</a></p>
+<section id="instruction" class="level2" data-number="11.1">
+<h2 data-number="11.1" class="anchored" data-anchor-id="instruction"><span class="header-section-number">11.1</span> Instruction</h2>
+<p>It’s pretty straightforward. Your goal is to create a function that removes the first and last characters of a string. You’re given one parameter, the original string. You don’t have to worry about strings with less than two characters.</p>
+</section>
+<section id="youtube-video" class="level2" data-number="11.2">
+<h2 data-number="11.2" class="anchored" data-anchor-id="youtube-video"><span class="header-section-number">11.2</span> YouTube Video</h2>
+<div class="quarto-video ratio ratio-16x9"><iframe data-external="1" src="https://www.youtube.com/embed/L8aczEhqymk?si=DSx84acpNvbkucrK" title="" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></div>
+</section>
+<section id="solution-code" class="level2" data-number="11.3">
+<h2 data-number="11.3" class="anchored" data-anchor-id="solution-code"><span class="header-section-number">11.3</span> Solution Code</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>removeChar <span class="ot">&lt;-</span> <span class="cf">function</span>(str){</span>
+<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a>  char <span class="ot">&lt;-</span> <span class="fu">unlist</span>(<span class="fu">strsplit</span>(str, <span class="st">""</span>))</span>
+<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a>  char_removed <span class="ot">&lt;-</span> char[<span class="sc">-</span><span class="fu">c</span>(<span class="dv">1</span>,<span class="fu">length</span>(char))]</span>
+<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a>  <span class="fu">paste</span>(char_removed, <span class="at">collapse =</span> <span class="st">""</span>)</span>
+<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>removeChar <span class="ot">&lt;-</span> <span class="cf">function</span>(str){</span>
+<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>    <span class="fu">substr</span>(str, <span class="dv">2</span>, <span class="fu">nchar</span>(str)<span class="sc">-</span><span class="dv">1</span>)</span>
+<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+</section>
+<section id="test" class="level2" data-number="11.4">
+<h2 data-number="11.4" class="anchored" data-anchor-id="test"><span class="header-section-number">11.4</span> Test</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(testthat)</span>
+<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a></span>
+<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">'basic tests'</span>, {</span>
+<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">removeChar</span>(<span class="st">'eloquent'</span>), <span class="st">'loquen'</span>)</span>
+<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">removeChar</span>(<span class="st">'country'</span>), <span class="st">'ountr'</span>)</span>
+<span id="cb3-6"><a href="#cb3-6" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">removeChar</span>(<span class="st">'person'</span>), <span class="st">'erso'</span>)</span>
+<span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">removeChar</span>(<span class="st">'place'</span>), <span class="st">'lac'</span>)</span>
+<span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="cell-output cell-output-stdout">
+<pre><code>Test passed 😸</code></pre>
+</div>
+</div>
+</section>
+<section id="supported-by" class="level2" data-number="11.5">
+<h2 data-number="11.5" class="anchored" data-anchor-id="supported-by"><span class="header-section-number">11.5</span> Supported by</h2>
+<div class="quarto-figure quarto-figure-center">
+<figure class="figure">
+<p><a href="https://www.starcore.co"><img src="new_starcore_logo.png" class="img-fluid figure-img"></a></p>
+<figcaption class="figure-caption">StarCore Analytics</figcaption>
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+  <div class="sidebar-item-container"> 
+  <a href="./cw005make_negative.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">5</span>&nbsp; <span class="chapter-title">Return Negative</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw006positive_sum.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">6</span>&nbsp; <span class="chapter-title">Sum of positive</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw007reversedstrings.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">7</span>&nbsp; <span class="chapter-title">Reversed Strings</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw011removeChar.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">11</span>&nbsp; <span class="chapter-title">Remove First and Last Character</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw012square_sum.html" class="sidebar-item-text sidebar-link active">
+ <span class="menu-text"><span class="chapter-number">12</span>&nbsp; <span class="chapter-title">Square(n) Sum</span></span></a>
+  </div>
+</li>
+    </ul>
+    </div>
+</nav>
+<div id="quarto-sidebar-glass" data-bs-toggle="collapse" data-bs-target="#quarto-sidebar,#quarto-sidebar-glass"></div>
+<!-- margin-sidebar -->
+    <div id="quarto-margin-sidebar" class="sidebar margin-sidebar">
+        <nav id="TOC" role="doc-toc" class="toc-active">
+    <h2 id="toc-title">Table of contents</h2>
+   
+  <ul>
+  <li><a href="#instruction" id="toc-instruction" class="nav-link active" data-scroll-target="#instruction"><span class="header-section-number">12.1</span> Instruction</a></li>
+  <li><a href="#youtube-video" id="toc-youtube-video" class="nav-link" data-scroll-target="#youtube-video"><span class="header-section-number">12.2</span> YouTube Video</a></li>
+  <li><a href="#solution-code" id="toc-solution-code" class="nav-link" data-scroll-target="#solution-code"><span class="header-section-number">12.3</span> Solution Code</a></li>
+  <li><a href="#test" id="toc-test" class="nav-link" data-scroll-target="#test"><span class="header-section-number">12.4</span> Test</a></li>
+  <li><a href="#supported-by" id="toc-supported-by" class="nav-link" data-scroll-target="#supported-by"><span class="header-section-number">12.5</span> Supported by</a></li>
+  </ul>
+</nav>
+    </div>
+<!-- main -->
+<main class="content" id="quarto-document-content">
+
+<header id="title-block-header" class="quarto-title-block default">
+<div class="quarto-title">
+<h1 class="title"><span class="chapter-number">12</span>&nbsp; <span class="chapter-title">Square(n) Sum</span></h1>
+</div>
+
+
+
+<div class="quarto-title-meta">
+
+    
+  
+    
+  </div>
+  
+
+</header>
+
+<p><span class="badge rounded-pill quarto-badge " style="background-color: grey;">8kyu</span> Tantangan #12/366 - 26 Feb 2024</p>
+<p><a href="https://www.codewars.com/kata/515e271a311df0350d00000f/train/r" class="uri">https://www.codewars.com/kata/515e271a311df0350d00000f/train/r</a></p>
+<section id="instruction" class="level2" data-number="12.1">
+<h2 data-number="12.1" class="anchored" data-anchor-id="instruction"><span class="header-section-number">12.1</span> Instruction</h2>
+<p>Complete the square sum function so that it squares each number passed into it and then sums the results together.</p>
+<p>For example, for [1, 2, 2] it should return 9 because <span class="math inline">1^2+2^2+2^2=9</span>.</p>
+</section>
+<section id="youtube-video" class="level2" data-number="12.2">
+<h2 data-number="12.2" class="anchored" data-anchor-id="youtube-video"><span class="header-section-number">12.2</span> YouTube Video</h2>
+<div class="quarto-video ratio ratio-16x9"><iframe data-external="1" src="https://www.youtube.com/embed/L8aczEhqymk?si=DSx84acpNvbkucrK" title="" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></div>
+</section>
+<section id="solution-code" class="level2" data-number="12.3">
+<h2 data-number="12.3" class="anchored" data-anchor-id="solution-code"><span class="header-section-number">12.3</span> Solution Code</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>square_sum <span class="ot">&lt;-</span> <span class="cf">function</span>(nums) {</span>
+<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a>  <span class="cf">for</span> (i <span class="cf">in</span> nums) {</span>
+<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a>    nums[i] <span class="ot">&lt;-</span> nums[i]<span class="sc">^</span><span class="dv">2</span></span>
+<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a>  }</span>
+<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a>  <span class="fu">sum</span>(nums, <span class="at">na.rm =</span> <span class="cn">TRUE</span>)</span>
+<span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>square_sum <span class="ot">&lt;-</span> <span class="cf">function</span>(nums) {</span>
+<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>  <span class="fu">sum</span>(nums<span class="sc">^</span><span class="dv">2</span>)</span>
+<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+</section>
+<section id="test" class="level2" data-number="12.4">
+<h2 data-number="12.4" class="anchored" data-anchor-id="test"><span class="header-section-number">12.4</span> Test</h2>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(testthat)</span>
+<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a></span>
+<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="fu">test_that</span>(<span class="st">"basic tests"</span>, {</span>
+<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">square_sum</span>(<span class="fu">c</span>(<span class="dv">1</span>, <span class="dv">2</span>)), <span class="dv">5</span>)</span>
+<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">square_sum</span>(<span class="fu">c</span>(<span class="dv">0</span>, <span class="dv">3</span>, <span class="dv">4</span>, <span class="dv">5</span>)), <span class="dv">50</span>)</span>
+<span id="cb3-6"><a href="#cb3-6" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">square_sum</span>(<span class="fu">c</span>()), <span class="dv">0</span>)</span>
+<span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">square_sum</span>(<span class="fu">c</span>(<span class="sc">-</span><span class="dv">1</span>, <span class="sc">-</span><span class="dv">2</span>)), <span class="dv">5</span>)</span>
+<span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">square_sum</span>(<span class="fu">c</span>(<span class="sc">-</span><span class="dv">1</span>, <span class="dv">0</span>, <span class="dv">1</span>)), <span class="dv">2</span>)</span>
+<span id="cb3-9"><a href="#cb3-9" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="cell-output cell-output-stdout">
+<pre><code>Test passed 🥇</code></pre>
+</div>
+</div>
+</section>
+<section id="supported-by" class="level2" data-number="12.5">
+<h2 data-number="12.5" class="anchored" data-anchor-id="supported-by"><span class="header-section-number">12.5</span> Supported by</h2>
+<div class="quarto-figure quarto-figure-center">
+<figure class="figure">
+<p><a href="https://www.starcore.co"><img src="new_starcore_logo.png" class="img-fluid figure-img"></a></p>
+<figcaption class="figure-caption">StarCore Analytics</figcaption>
+</figure>
+</div>
+
+
+</section>
+
+</main> <!-- /main -->
+<script id="quarto-html-after-body" type="application/javascript">
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+    // clear code selection
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+        <i class="bi bi-arrow-left-short"></i> <span class="nav-page-text"><span class="chapter-number">11</span>&nbsp; <span class="chapter-title">Remove First and Last Character</span></span>
+      </a>          
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index.html

@@ -162,6 +162,30 @@ ul.task-list li input[type="checkbox"] {
   <a href="./cw008bool_to_word.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Convert boolean values to strings ‘Yes’ or ‘No’</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw009number_to_string.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Convert a Number to a String!</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw010opposite.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Opposite number</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw011removeChar.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">11</span>&nbsp; <span class="chapter-title">Remove First and Last Character</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cw012square_sum.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">12</span>&nbsp; <span class="chapter-title">Square(n) Sum</span></span></a>
+  </div>
 </li>
     </ul>
     </div>