JavaScript
var sum = 0;
for (var i = 1; i <= 10; i++) {
console.log('i: ' + i);
// Add a check here
console.log('sum: ' + sum);
}
Thanks! We’ll fix everything at once!
Result
- Inside the loop, add a check to make sure that the counter is even (i % 2 === 0).
- If the check is executed, increase the variable sum by 2.
- Inside the condition, after increasing the sum, log the 'even number' string in the console.
- After the check is complete, add the else branch and increase the sum inside it by 1.
- Inside the else, after increasing the sum, log the 'odd number' line in the console.
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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">Searching for an even number</h1><div class="course-theory__content-text"><p>Checks in loops are very convenient. They allow you to do checks at each iteration of the loop.</p><p>For example, we will check whether the number <code>i</code> is now even in the loop from previous tasks. If the number is even, we will add <code>2</code> to the sum, and if the number is odd, we will add <code>1</code>.</p><p>How can I check if the number is even? Here the operator <code>%</code> can help. It is called the <em>remainder in division</em> and, as the name implies, returns the remainder in division.</p><pre><code>10 % 5; // Returns 0
12 % 5; // Returns 2
7 % 3; // Returns 1
5.5 % 2; // Returns 1.5</code></pre><p>How does this help in determining an even or odd number? An even number is divided by <code>2</code> without remainder. Therefore, if the division <code>i% 2</code> returns <code>0</code> the number is even, otherwise the number is odd.</p><p>Let’s write a check using <code>%</code> in our loop.</p><p class="info info--gray"><span class="info__heading">By the way,</span> the value returned by the operator <code>% </code> is the same as the remainder in division in arithmetic. This division is easier to understand on an everyday example. Imagine that you have 13 chocolates, and there are 4 people (including you). How to divide the chocolates among everyone so as not to offend anyone? It’s not possible to divide the chocolates equally, because 13 cannot be divided by 4 without fractional parts. But 12 can be equally divided by 4. You can give 3 chocolates to everyone. Then you will give out 12 chocolates and there will still be one left, because initially there were 13 chocolates. This left-over chocolate is the remainder in division.</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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for (var i = 1; i <= 10; i++) {
console.log('i: ' + i);
// Add a check here
console.log('sum: ' + sum);
}
</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/division/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aec34dab809"><input type="hidden" name="csrf_value" value="aa313105e66158126b7dd96f307a4696"><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/calc-toner-1" title="How much does printing cost?"><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">Inside the loop, add a check to make sure that the counter is even (<code>i % 2 === 0</code>)<span class="mark">.</span></li><li class="course-goals__list-item">If the check is executed, increase the variable <code>sum</code> by <code>2</code><span class="mark">.</span></li><li class="course-goals__list-item">Inside the condition, after increasing the sum, log the <code>'even number'</code> string in the console.</li><li class="course-goals__list-item">After the check is complete, add the <code>else</code> branch and increase the <code>sum</code> inside it by <code>1</code><span class="mark">.</span></li><li class="course-goals__list-item">Inside the <code>else</code>, after increasing the <code>sum</code>, log the <code>'odd number'</code> line 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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