update

countsheep.html

@@ -266,7 +266,7 @@ 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>

evenodd.html

@@ -258,7 +258,7 @@ 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>
@@ -270,19 +270,19 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <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>

make_negative.html

@@ -263,7 +263,7 @@ 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>

multiply.html

@@ -226,6 +226,9 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 <section id="instruction" class="level2" data-number="2.1">
 <h2 data-number="2.1" class="anchored" data-anchor-id="instruction"><span class="header-section-number">2.1</span> Instruction</h2>
 <p>This code does not execute properly. Try to figure out why.</p>
+<pre><code>mul &lt;- function(a, b) {
+  a * c # try to figure out why it doesn't work!
+}</code></pre>
 </section>
 <section id="youtube-video" class="level2" data-number="2.2">
 <h2 data-number="2.2" class="anchored" data-anchor-id="youtube-video"><span class="header-section-number">2.2</span> YouTube Video</h2>
@@ -233,13 +236,35 @@ pre > code.sourceCode > span > a:first-child::before { text-decoration: underlin
 </section>
 <section id="solution-code" class="level2" data-number="2.3">
 <h2 data-number="2.3" class="anchored" data-anchor-id="solution-code"><span class="header-section-number">2.3</span> Solution Code</h2>
-<p>Solusi bar-bar</p>
-<p>Solusi simple</p>
+<p>Karena argumen dari function <code>mul()</code> adalah <code>a</code> dan <code>b</code> sedangkan operasi perkalian di dalamnya menggunakan <code>c</code> yang belum diketahui dan tidak ada objek tersebut.</p>
+<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>mul <span class="ot">&lt;-</span> <span class="cf">function</span>(a, b) {</span>
+<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>  a <span class="sc">*</span> c <span class="co"># try to figure out why it doesn't work!</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>
+<p>Solusi: ganti objek <code>c</code> di dalam function <code>mul()</code> dengan <code>b</code> dari argumen function tersebut.</p>
+<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>mul <span class="ot">&lt;-</span> <span class="cf">function</span>(a, b) {</span>
+<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a>  a <span class="sc">*</span> b </span>
+<span id="cb3-3"><a href="#cb3-3" 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="2.4">
 <h2 data-number="2.4" class="anchored" data-anchor-id="test"><span class="header-section-number">2.4</span> Test</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><span class="fu">library</span>(testthat)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<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">"test for associativity of multiplication"</span>, {</span>
+<span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a>  a <span class="ot">&lt;-</span> <span class="fu">runif</span>(<span class="dv">1</span>, <span class="dv">0</span>, <span class="dv">10000</span>)</span>
+<span id="cb4-5"><a href="#cb4-5" aria-hidden="true" tabindex="-1"></a>  b <span class="ot">&lt;-</span> <span class="fu">runif</span>(<span class="dv">1</span>, <span class="dv">0</span>, <span class="dv">10000</span>)</span>
+<span id="cb4-6"><a href="#cb4-6" aria-hidden="true" tabindex="-1"></a>  c <span class="ot">&lt;-</span> <span class="fu">runif</span>(<span class="dv">1</span>, <span class="dv">0</span>, <span class="dv">10000</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">mul</span>(a, b), a <span class="sc">*</span> b)</span>
+<span id="cb4-8"><a href="#cb4-8" aria-hidden="true" tabindex="-1"></a>  <span class="fu">expect_equal</span>(<span class="fu">mul</span>(<span class="fu">mul</span>(a, b), c), a <span class="sc">*</span> b <span class="sc">*</span> c)</span>
+<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>
+</div>
 </div>
 </section>
 <section id="supported-by" class="level2" data-number="2.5">

positive_sum.html

@@ -273,7 +273,7 @@ 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>

reducegrow.html

@@ -260,7 +260,7 @@ 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>