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| <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> | |
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| <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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| <h1 class="title"><span class="chapter-number">11</span> <span class="chapter-title">Remove First and Last Character</span></h1> | |
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| <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" class="uri">https://www.codewars.com/kata/56bc28ad5bdaeb48760009b0</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> | |
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| </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"><-</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"><-</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"><-</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"><-</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> | |
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| <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> | |
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| <h2 data-number="11.5" class="anchored" data-anchor-id="supported-by"><span class="header-section-number">11.5</span> Supported by</h2> | |
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| // button target | |
| const button = e.trigger; | |
| // don't keep focus | |
| button.blur(); | |
| // flash "checked" | |
| button.classList.add('code-copy-button-checked'); | |
| var currentTitle = button.getAttribute("title"); | |
| button.setAttribute("title", "Copied!"); | |
| let tooltip; | |
| if (window.bootstrap) { | |
| button.setAttribute("data-bs-toggle", "tooltip"); | |
| button.setAttribute("data-bs-placement", "left"); | |
| button.setAttribute("data-bs-title", "Copied!"); | |
| tooltip = new bootstrap.Tooltip(button, | |
| { trigger: "manual", | |
| customClass: "code-copy-button-tooltip", | |
| offset: [0, -8]}); | |
| tooltip.show(); | |
| } | |
| setTimeout(function() { | |
| if (tooltip) { | |
| tooltip.hide(); | |
| button.removeAttribute("data-bs-title"); | |
| button.removeAttribute("data-bs-toggle"); | |
| button.removeAttribute("data-bs-placement"); | |
| } | |
| button.setAttribute("title", currentTitle); | |
| button.classList.remove('code-copy-button-checked'); | |
| }, 1000); | |
| // clear code selection | |
| e.clearSelection(); | |
| }); | |
| function tippyHover(el, contentFn) { | |
| const config = { | |
| allowHTML: true, | |
| content: contentFn, | |
| maxWidth: 500, | |
| delay: 100, | |
| arrow: false, | |
| appendTo: function(el) { | |
| return el.parentElement; | |
| }, | |
| interactive: true, | |
| interactiveBorder: 10, | |
| theme: 'quarto', | |
| placement: 'bottom-start' | |
| }; | |
| window.tippy(el, config); | |
| } | |
| const noterefs = window.document.querySelectorAll('a[role="doc-noteref"]'); | |
| for (var i=0; i<noterefs.length; i++) { | |
| const ref = noterefs[i]; | |
| tippyHover(ref, function() { | |
| // use id or data attribute instead here | |
| let href = ref.getAttribute('data-footnote-href') || ref.getAttribute('href'); | |
| try { href = new URL(href).hash; } catch {} | |
| const id = href.replace(/^#\/?/, ""); | |
| const note = window.document.getElementById(id); | |
| return note.innerHTML; | |
| }); | |
| } | |
| let selectedAnnoteEl; | |
| const selectorForAnnotation = ( cell, annotation) => { | |
| let cellAttr = 'data-code-cell="' + cell + '"'; | |
| let lineAttr = 'data-code-annotation="' + annotation + '"'; | |
| const selector = 'span[' + cellAttr + '][' + lineAttr + ']'; | |
| return selector; | |
| } | |
| const selectCodeLines = (annoteEl) => { | |
| const doc = window.document; | |
| const targetCell = annoteEl.getAttribute("data-target-cell"); | |
| const targetAnnotation = annoteEl.getAttribute("data-target-annotation"); | |
| const annoteSpan = window.document.querySelector(selectorForAnnotation(targetCell, targetAnnotation)); | |
| const lines = annoteSpan.getAttribute("data-code-lines").split(","); | |
| const lineIds = lines.map((line) => { | |
| return targetCell + "-" + line; | |
| }) | |
| let top = null; | |
| let height = null; | |
| let parent = null; | |
| if (lineIds.length > 0) { | |
| //compute the position of the single el (top and bottom and make a div) | |
| const el = window.document.getElementById(lineIds[0]); | |
| top = el.offsetTop; | |
| height = el.offsetHeight; | |
| parent = el.parentElement.parentElement; | |
| if (lineIds.length > 1) { | |
| const lastEl = window.document.getElementById(lineIds[lineIds.length - 1]); | |
| const bottom = lastEl.offsetTop + lastEl.offsetHeight; | |
| height = bottom - top; | |
| } | |
| if (top !== null && height !== null && parent !== null) { | |
| // cook up a div (if necessary) and position it | |
| let div = window.document.getElementById("code-annotation-line-highlight"); | |
| if (div === null) { | |
| div = window.document.createElement("div"); | |
| div.setAttribute("id", "code-annotation-line-highlight"); | |
| div.style.position = 'absolute'; | |
| parent.appendChild(div); | |
| } | |
| div.style.top = top - 2 + "px"; | |
| div.style.height = height + 4 + "px"; | |
| let gutterDiv = window.document.getElementById("code-annotation-line-highlight-gutter"); | |
| if (gutterDiv === null) { | |
| gutterDiv = window.document.createElement("div"); | |
| gutterDiv.setAttribute("id", "code-annotation-line-highlight-gutter"); | |
| gutterDiv.style.position = 'absolute'; | |
| const codeCell = window.document.getElementById(targetCell); | |
| const gutter = codeCell.querySelector('.code-annotation-gutter'); | |
| gutter.appendChild(gutterDiv); | |
| } | |
| gutterDiv.style.top = top - 2 + "px"; | |
| gutterDiv.style.height = height + 4 + "px"; | |
| } | |
| selectedAnnoteEl = annoteEl; | |
| } | |
| }; | |
| const unselectCodeLines = () => { | |
| const elementsIds = ["code-annotation-line-highlight", "code-annotation-line-highlight-gutter"]; | |
| elementsIds.forEach((elId) => { | |
| const div = window.document.getElementById(elId); | |
| if (div) { | |
| div.remove(); | |
| } | |
| }); | |
| selectedAnnoteEl = undefined; | |
| }; | |
| // Attach click handler to the DT | |
| const annoteDls = window.document.querySelectorAll('dt[data-target-cell]'); | |
| for (const annoteDlNode of annoteDls) { | |
| annoteDlNode.addEventListener('click', (event) => { | |
| const clickedEl = event.target; | |
| if (clickedEl !== selectedAnnoteEl) { | |
| unselectCodeLines(); | |
| const activeEl = window.document.querySelector('dt[data-target-cell].code-annotation-active'); | |
| if (activeEl) { | |
| activeEl.classList.remove('code-annotation-active'); | |
| } | |
| selectCodeLines(clickedEl); | |
| clickedEl.classList.add('code-annotation-active'); | |
| } else { | |
| // Unselect the line | |
| unselectCodeLines(); | |
| clickedEl.classList.remove('code-annotation-active'); | |
| } | |
| }); | |
| } | |
| const findCites = (el) => { | |
| const parentEl = el.parentElement; | |
| if (parentEl) { | |
| const cites = parentEl.dataset.cites; | |
| if (cites) { | |
| return { | |
| el, | |
| cites: cites.split(' ') | |
| }; | |
| } else { | |
| return findCites(el.parentElement) | |
| } | |
| } else { | |
| return undefined; | |
| } | |
| }; | |
| var bibliorefs = window.document.querySelectorAll('a[role="doc-biblioref"]'); | |
| for (var i=0; i<bibliorefs.length; i++) { | |
| const ref = bibliorefs[i]; | |
| const citeInfo = findCites(ref); | |
| if (citeInfo) { | |
| tippyHover(citeInfo.el, function() { | |
| var popup = window.document.createElement('div'); | |
| citeInfo.cites.forEach(function(cite) { | |
| var citeDiv = window.document.createElement('div'); | |
| citeDiv.classList.add('hanging-indent'); | |
| citeDiv.classList.add('csl-entry'); | |
| var biblioDiv = window.document.getElementById('ref-' + cite); | |
| if (biblioDiv) { | |
| citeDiv.innerHTML = biblioDiv.innerHTML; | |
| } | |
| popup.appendChild(citeDiv); | |
| }); | |
| return popup.innerHTML; | |
| }); | |
| } | |
| } | |
| }); | |
| </script> | |
| <nav class="page-navigation"> | |
| <div class="nav-page nav-page-previous"> | |
| <a href="./cw010opposite.html" class="pagination-link"> | |
| <i class="bi bi-arrow-left-short"></i> <span class="nav-page-text"><span class="chapter-number">10</span> <span class="chapter-title">Opposite number</span></span> | |
| </a> | |
| </div> | |
| <div class="nav-page nav-page-next"> | |
| <a href="./cw012square_sum.html" class="pagination-link"> | |
| <span class="nav-page-text"><span class="chapter-number">12</span> <span class="chapter-title">Square(n) Sum</span></span> <i class="bi bi-arrow-right-short"></i> | |
| </a> | |
| </div> | |
| </nav> | |
| </div> <!-- /content --> | |
| </body></html> |