JavaScript
var expectedUsers = 1000;
var usersByDay = [812, 1360, 657, 1247];
// Drawing the traffic graph
muffin.plot(usersByDay, expectedUsers);
for (var i = 0; i <= usersByDay.length - 1; i++) {
console.log(usersByDay[i]);
}
// Calculating the average traffic value
var averageUsers = 0;
console.log('Average traffic: ' + averageUsers);
if (averageUsers > expectedUsers) {
console.log('Traffic is amazing. Keep up the good work!');
} else {
console.log('Traffic is so-so. You need to try harder!');
}
Thanks! We’ll fix everything at once!
Result
- Before the loop, add a variable totalUsers with a zero value.
- Inside the loop, remove console log and increase the value of the variable totalUsers by usersByDay[i].
- Inside the loop, log the variable totalUsers in the console.
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</script><link rel="stylesheet" href="https://assets.htmlacademy.org/css/core.v284.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/profile.v236.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course.v246.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-light.v20.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-en.v2.css"><script src="https://assets.htmlacademy.org/js/sentry.js" data-sentry="3774884cc81746ed84c0ba7c5cd4ac7b" data-project="26" data-version="2"></script><link rel="stylesheet" href="/css/custom.css"><link rel="stylesheet" href="/css/cookies.css"><link rel="preload" as="script" href="https://assets.htmlacademy.org/js/general.v274.js"><title>Summation in the loop — Arrays — HTML Academy</title><meta name="csrf-token" content="10264caf322823086fca37a7326b9bd2a54"><meta property="og:type" content="website"><meta property="og:site_name" content="HTML Academy"><meta name="twitter:url" property="og:url" content="https://htmlacademy.org"><meta name="twitter:title" property="og:title" content="Interactive online courses HTML Academy"><meta name="twitter:description" property="og:description" content="Together we’ll learn how to work with real code, solve true-to-life problems, use cutting edge technologies. 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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 main-nav__course-contents-item--current"><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"><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/average-with-array">Finishing refactoring</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%2Fsum-in-loop" 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%2Fsum-in-loop" 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">Summation in the loop</h1><div class="course-theory__content-text"><p>In a loop, you can log array elements in the console, as well as perform some operations with them. For example, summarize. You already did this in the <a href="/courses/javascript-programming/loops/accumulation"></a>“Loops”</a> chapter.</p><p>To do this, you must enter a variable with a zero value before the loop. Then at each iteration add to it the value of the next element of the array. As a result, after the loop, the variable will be the sum of all the elements.</p><p>Our task is to find the average value. And for this, you first need to calculate the sum of all the elements.</p><p>Let’s rewrite the loop so that it doesn’t log the values of the elements in the console, but consistently stacks them together and writes them into one variable.</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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var usersByDay = [812, 1360, 657, 1247];
// Drawing the traffic graph
muffin.plot(usersByDay, expectedUsers);
for (var i = 0; i <= usersByDay.length - 1; i++) {
console.log(usersByDay[i]);
}
// Calculating the average traffic value
var averageUsers = 0;
console.log('Average traffic: ' + averageUsers);
if (averageUsers > expectedUsers) {
console.log('Traffic is amazing. Keep up the good work!');
} else {
console.log('Traffic is so-so. You need to try harder!');
}
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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/average-with-array" title="Finishing refactoring"><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">Before the loop, add a variable <code>totalUsers</code> with a zero value.</li><li class="course-goals__list-item">Inside the loop, remove console log and increase the value of the variable <code>totalUsers</code> by <code>usersByDay[i]</code><span class="mark">.</span></li><li class="course-goals__list-item">Inside the loop, log the variable <code>totalUsers</code> in the console.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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