JavaScript
var totalPages = 6; // Total number of pages
var consumptionTotal = 0; // Total toner consumption
var consumptionPerPage = 70; // Toner consumption per page
var economyMode = false;
for (var page = 1; page <= totalPages; page++) {
muffin.print(page);
if (economyMode && page > 3) {
consumptionTotal += consumptionPerPage * 0.5;
}
consumptionTotal += consumptionPerPage;
console.log(consumptionTotal);
}
Thanks! We’ll fix everything at once!
Result
- Add else and move consumptionTotal += consumptionPerPage; there.
- Change the economyMode value to true.
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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>Saving ink — Loops — HTML Academy</title><meta name="csrf-token" content="8264caf322823086fca37a7326b9bd2a54"><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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New project: driver development</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/use-for-loop">2. Managing the number of copies</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/print-all-pages">3. Learning the for loop</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/print-pages-fixed">4. Correcting the loop</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/print-reverse">5. Printing the pages in reverse order</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/print-odd-pages">6. Printing only odd pages</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/print-even-pages">7. Printing only even pages</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/all-modes-1">8. Printing driver: copy mode</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/all-modes-2">9. Printing driver: all pages</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/all-modes-3">10. Printing driver: pages in reverse order</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/all-modes-4">11. Print driver: even and odd pages</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/all-modes-5">12. Print driver: switching evens and odds</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/accumulation">13. Accumulation in the loop</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/conditions">14. Checks in loops</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/division">15. Searching for an even number</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/calc-toner-1">16. How much does printing cost?</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/calc-toner-2">17. Economy printing</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/loops/calc-toner-3">18. Saving ink</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/summary-1">19. Summary of “Loops”. Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/for-challenge">20. Third program: “Protein shake!”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/hello-while">21. It’s been a “while”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/while-total">22. The while loop, summation</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/dart-machine-1">23. Another project: a dart machine</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/dart-machine-2">24. Dart machine: accumulating misses</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/dart-machine-3">25. Dart machine: defeat</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/dart-machine-5">26. Dart machine: final scoreboard</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/summary-2">27. Summary of “Loops”. Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/loops/while-challenge">28. Fourth program: “Mad Dryer”</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-programming/loops/summary-1">Summary of “Loops”. 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1.293zm-7.198-14.04c-.788-.226-1.61-.314-2.427-.26-1.264 0-2.436.082-2.52.082h-.38v.354s.715 3.55 3.96 3.895c.693.006 1.385-.025 2.074-.093.27-.084 1.71-.428 1.71-.428-.025-1.56-.975-2.956-2.417-3.552zm.53 3.207c-.558.142-1.135.2-1.71.177-1.14-.075-2.16-.728-2.707-1.73-.247-.37-.432-.78-.548-1.21.455 0 1.18-.092 2.073-.175h.596c-.084.688-.242 2.464.483 2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 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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">Saving ink</h1><div class="course-theory__content-text"><p>Toner count is almost ready. For now the code in the loop body looks like this:</p><pre><code>if (economyMode && page > 3) {
consumptionTotal += consumptionPerPage * 0.5;
}
consumptionTotal += consumptionPerPage;</code></pre><p>It turns out that if the economy mode is on and the page number is greater than three, we use half the ink compared with the standard mode per one page. And then, it does not matter if the condition works or not, we still increase the consumption rate <code>consumptionTotal += consumptionPerPage;</code>. It turns out that we are not saving, but rather wasting resources. Add <code>else</code> to the condition and transfer the string <code>consumptionTotal += consumptionPerPage;</code> there. Then turn on toner save mode and check that everything is working correctly.</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 totalPages = 6; // Total number of pages
var consumptionTotal = 0; // Total toner consumption
var consumptionPerPage = 70; // Toner consumption per page
var economyMode = false;
for (var page = 1; page <= totalPages; page++) {
muffin.print(page);
if (economyMode && page > 3) {
consumptionTotal += consumptionPerPage * 0.5;
}
consumptionTotal += consumptionPerPage;
console.log(consumptionTotal);
}
</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/loops/calc-toner-3/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aed430d1479"><input type="hidden" name="csrf_value" value="32069522b0c1c4b37e48eadecc7824fb"><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/loops/summary-1" title="Summary of “Loops”. Part 1"><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">Add <code>else</code> and move <code>consumptionTotal += consumptionPerPage;</code> there.</li><li class="course-goals__list-item">Change the <code>economyMode</code> value to <code>true</code><span class="mark">.</span></li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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