JavaScript
var usersByDay = [1, 2, 3, 4, 5, 6];
console.log(usersByDay);
if (usersByDay.length % 2 !== 0) {
var medianIndex = (usersByDay.length - 1) / 2;
console.log(medianIndex);
var median = usersByDay[medianIndex];
console.log(median);
}
Thanks! We’ll fix everything at once!
Result
- In the alternative branch of the condition, add the variable leftIndex with the value usersByDay.length / 2 - 1.
- And variable rightIndex with value usersByDay.length / 2.
- Log both variables in the console.
- In the same condition branch, add variable median with value (usersByDay[leftIndex] + usersByDay[rightIndex]) / 2.
- Log it in the console as well.
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Minimum of boring theory and lots of practical tasks."><meta name="twitter:image" property="og:image" content="https://htmlacademy.org/og/htmlacademy.png"><meta name="twitter:card" content="summary_large_image"><link rel="canonical" href="https://htmlacademy.org/courses/javascript-programming/arrays/median-end"><meta name="theme-color" content="#2f358f"></head><body class="course-interface course-interface--light" data-base="/assets/courses/5/"><header class="page-header page-header--course"><div class="page-header__inner"><div class="page-header__top"><a class="page-header__logo" href="/" aria-label="HTML Academy Home"><img src="https://assets.htmlacademy.org/img/logo--small.svg?cs=1218aec0be4a5f23db79ad29a14e30f7f9fb9a25" width="24" height="36" alt="HTML Academy"></a><nav class="main-nav main-nav--mini" role="navigation"><div class="main-nav__course-nav"><a class="main-nav__course-item main-nav__course-button main-nav__course-button--prev" href="/courses/javascript-programming/arrays/median-start">Median of an odd number of elements</a><div class="main-nav__course-item main-nav__course-list main-nav__course-list--collapsed"><b class="main-nav__course-title">Arrays</b><span class="main-nav__course-stat">26/30</span><div class="main-nav__course-contents"><a class="main-nav__course-contents-link" href="/courses/javascript-programming/arrays">Back to the list of tasks</a><ul class="main-nav__course-contents-list"><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/big-data">1. Little Muffin and Big Data</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/average-value">2. Average value</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/analizer-almost-ready">3. Finishing the traffic analyzer</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/new-datum">4. New data</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/massive-data">5. A lot of data? An array!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/read-from-array">6. Reading from an array using index</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/variable-as-index">7. Variable as index</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/array-length">8. Array length</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/loop-through-array">9. Let’s hit arrays with loops!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/sum-in-loop">10. Summation in the loop</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/average-with-array">11. Finishing refactoring</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/one-little-investigation">12. One small analytical investigation</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/write-by-index">13. Writing to an array by index</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/investigation-completed">14. The murderer is a butler!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/summary-1">15. Summary of “Arrays”. Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/cipher-beginner">16. Fifth program: Beginner decryptor</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/vague-suspicions">17. Vague suspicions</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/swap-elements">18. Swapping the elements</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/minimum-element">19. Looking for the minimum element</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/minimum-elemen-found">20. The minimum element is found!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/start-sorting">21. Starting sorting</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/continue-sorting">22. Continue sorting</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/finish-sorting">23. Finish sorting</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/test-sorting">24. Testing the sorting</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/median-start">25. Median of an odd number of elements</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/arrays/median-end">26. Median of an even number of elements</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/investigation-continues">27. Green light</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/investigation-completed-again">28. The murderer is the butler, again!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/summary-2">29. Summary of “Arrays”. Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/best-jumps-challenge">30. Sixth program: Long jump records</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-programming/arrays/investigation-continues">Green light</a></div><ul class="main-nav__list main-nav__list--user main-nav__list--user-guest"><li class="main-nav__item" itemprop="name"><a class="main-nav__link" href="/signup?redirect_url=%2Fcourses%2Fjavascript-programming%2Farrays%2Fmedian-end" title="Sign up" data-modal="open" data-value="register" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use xlink:href="/img/sprites/general.svg#user"></use></svg></span>Sign up</a></li><li class="main-nav__item main-nav__item--login" itemprop="name"><a class="main-nav__link" href="/login?redirect_url=%2Fcourses%2Fjavascript-programming%2Farrays%2Fmedian-end" title="Log in" data-modal="open" data-value="login" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg 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2.79-6.835-.084.354 2.613.43 4.138-1.208 1.078-1.125.446-2-.186-3.375-1.71-3.552-4.585-6.323-7.384-8.918-.716-.69-1.44-2.428-2.706-2-.995.353-.93 3.2-.716 4.073 1.09 7.448 4.065 18.263 4.065 18.263zm37.372-.78c-1.704-1.826-2.822-4.12-3.208-6.585 0 .354-2.614.354-4.056-1.29-.995-1.127-.362-1.86.363-3.117 1.86-3.198 4.863-5.718 7.746-8.136.81-.604 1.627-1.47 2.79-.93.994.428.715 2.334.548 3.115-1.083 5.72-2.48 11.376-4.183 16.943z" fill="#FFF"/><path d="M53.564 20.422c-1.98.51-4.138 1.636-5.105 3.487-.43-2.196 1.645-4.65 3.393-5.832.333-.21.312-.703-.037-.886-.162-.085-.357-.076-.512.022-2.157 1.562-4.417 4.5-3.784 7.188.076.262.354.41.614.325l-.075.28c-.085.603.93.864.994.26.446-2.158 2.706-3.376 4.77-3.897.372-.076.522-.526.27-.81-.133-.15-.342-.204-.53-.138zM17.457 18.06c-.55-.354-.995.428-.55.865 1.433 1.004 3.182 3.05 3.395 4.956-.93-1.86-3.05-2.975-5.105-3.486-.386-.005-.633.41-.445.747.042.076.103.14.176.184 2.073.52 4.324 1.73 4.77 3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Median of an even number of elements</h1><div class="course-theory__content-text"><blockquote><ul><li>Well done! Take a patty from the shelf.</li><li>But there are two of them there.</li><li>Take the one in the middle.</li></ul></blockquote><p>Approximately the same situation occurs with calculating the median when an even number of elements are stored in the array. But unlike the situation with patties, we found the solution for the median. If the number of elements is even, the median is calculated as the average of the two elements: the left one and the right one from the middle.</p><pre><code>// Median: 3
[0, 1, <mark>2</mark>, <mark>4</mark>, 50, 100]</code></pre><p>Let’s once again derive the formulas of the indices of the two elements: the left one and the right one from the middle.</p><pre><code>// Length 1, left index 1, right index 2
[1, <mark>2</mark>, <mark>3</mark>, 4]
// Length 6, left index 2, right index 3
[1, 2, <mark>3</mark>, <mark>4</mark>, 5, 6]
// Length 8, left index 3, right index 4
[1, 2, 3, <mark>4</mark>, <mark>5</mark>, 6, 7, 8]</code></pre><p>Divide the array length by two and subtract one: and we got the left index. Divide array length by two: and we got the right index.</p><p>Let’s add calculating the median for an even number of elements in the array to the alternative branch of the condition.</p><p class="info info--gray"><span class="info__heading">Please note,</span> that this median search algorithm will not work for empty arrays and the result will be <code>NaN</code>. It’s because value <code>undefined</code> sneaks into the calculations, and this value returns <code>NaN</code> in any mathematical operations.</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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</script><noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript></div></div></section><div class="course-theory__controls"><button class="button button--close" type="button">To the task</button></div></div></div><div class="course-layout__column course-layout__column--left"><ul class="js--course-tabs course-tabs course-layout__course-tabs"><li class="course-tabs__item course-tab js--editor-tab course-tabs__item--limited course-tabs__item--limited-large course-tab--active" data-editor="js"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">script.js</span></span></li></ul><div class="course-layout__editors"><div class="js--editor course-editor course-layout__editor" id="" data-tab="js" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">JavaScript</span></span><div class="course-editor__item" id="js-editor">var usersByDay = [1, 2, 3, 4, 5, 6];
console.log(usersByDay);
if (usersByDay.length % 2 !== 0) {
var medianIndex = (usersByDay.length - 1) / 2;
console.log(medianIndex);
var median = usersByDay[medianIndex];
console.log(median);
}
</div></div></div><div class="course-editor-controls"><button class="course-editor-controls__item course-editor-controls__item--answer" type="button">Show the answer</button></div><div class="js--feedback course-unhappy"><button class="js--feedback-btn course-unhappy__button" type="button"><span class="sr-only">Complain</span><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#unhappy"></use></svg></button><div class="js--feedback-modal course-unhappy__modal course-unhappy__modal--step-one"><form method="POST" action="/courses/javascript-programming/arrays/median-end/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aebc9a6909a"><input type="hidden" name="csrf_value" value="3cb9aef0e669eb3dac377b776a25561a"><p class="course-unhappy__text">What didn’t you like in this task?</p><div class="course-unhappy__slide"><div class="course-unhappy__wrap"><div class="course-unhappy__list"><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="1" type="checkbox"><span class="checkbox__text">The code check doesn’t work</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="2" type="checkbox"><span class="checkbox__text">The task is too difficult</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="3" type="checkbox"><span class="checkbox__text">The theory is hard to understand</span></label><label class="checkbox checkbox--small"><input class="js--feedback-other-checkbox checkbox__input" name="problems" value="0" type="checkbox"><span class="checkbox__text">Other (will write below)</span></label></div><div class="course-unhappy__message"><label class="sr-only" for="id-message">Другое (сейчас напишу)</label><textarea class="field field--area" id="id-message" name="message" placeholder="For example, a typo in the word «heading»"></textarea></div></div></div><button class="course-unhappy__control course-unhappy__control--prev" type="button"><span class="sr-only">Prev</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="course-unhappy__control course-unhappy__control--next" type="button" disabled><span class="sr-only">Next</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="js--submit-btn button" disabled>Submit</button></form><p class="course-unhappy__result hidden">Thanks! We’ll fix everything at once!</p></div></div></div><div class="course-layout__column course-layout__column--right"><span class="course-separator-control"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-arrows-separator"></use></svg></span><div class="course-browser"><div class="course-browser__menu"><span class="course-browser__menu-item course-browser__address"><span class="course-browser__menu-item-inner">Console</span></span><button class="js--autorun course-browser__menu-item course-browser__menu-button course-browser__menu-button--text-with-icon course-browser__menu-button--autorun course-browser__menu-button--autorun-on" title="Autorun" type="button"><span class="course-browser__menu-item-inner"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-autorun"></use></svg>
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</span></button><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--expand" type="button"><svg xmlns="http://www.w3.org/2000/svg" width="11" height="11" viewBox="0 0 11 11"><path d="M1.375 5.125v4.5h4.5m3.75-3.75v-4.5h-4.5" fill="none" fill-rule="evenodd" stroke="currentColor"></path></svg></button></div><div class="course-browser__notification js--browser-change-heading hidden"><p class="course-browser__notification-text">The code has changed, click “Run” or turn autorun on.</p><button class="course-browser__notification-button course-browser__notification-button--play js--close" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-play"></use></svg>
Run</button></div><div class="course-browser__content"><div class="console js--console"><h2 class="sr-only">Result</h2><div class="console__content js--console__content"></div></div></div><div class="course-goals js--goals"><div class="course-goals__heading"><span class="course-goals__heading-title"><span class="course-goals__count-label">Goals</span><span class="course-goals__count">completed</span></span><button class="course-goals__button course-goals__button--expand js--goals__expand" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button><a class="course-goals__button course-goals__button--next button button--green button--without-border hidden" href="/courses/javascript-programming/arrays/investigation-continues" title="Green light"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><ol class="course-goals__list"><li class="course-goals__list-item">In the alternative branch of the condition, add the variable <code>leftIndex</code> with the value <code>usersByDay.length / 2 - 1</code><span class="mark">.</span></li><li class="course-goals__list-item">And variable <code>rightIndex</code> with value <code>usersByDay.length / 2</code><span class="mark">.</span></li><li class="course-goals__list-item">Log both variables in the console.</li><li class="course-goals__list-item">In the same condition branch, add variable <code>median</code> with value <code>(usersByDay[leftIndex] + usersByDay[rightIndex]) / 2</code><span class="mark">.</span></li><li class="course-goals__list-item">Log it in the console as well.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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