JavaScript
var calculateMiles = function (distance, isBusinessClass) {
if (isBusinessClass) {
return distance * 0.22;
}
return distance * 0.18;
};
var milesEconom = calculateMiles(3000, false);
var milesBusiness = calculateMiles(3000, true);
console.log('With economy class from MuffAir, you’ll get ' + milesEconom + ' miles');
console.log('With business class of MuffAir, you’ll save ' + milesBusiness + ' miles');
Thanks! We’ll fix everything at once!
Result
- In the body of the function, it the very beginning, create variable percent equal to 0.18 on the 2nd line.
- Inside the condition, instead of calculating miles, increase variable percent by 0.04.
- Replace the expression that the function returns with distance * percent.
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Return from function</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/summary-1">9. Summary of “Functions”. Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/challenge-salary">10. Seventh program: “From salary to salary”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/check-flight-class">11. Business trip</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/add-variables">12. Write, simplify</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/refactor-return">13. Get rid of unnecessary</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/functions/optimization">14. 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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">Make me beautiful</h1><div class="course-theory__content-text"><p>The first step of refactoring is complete. The most important thing is that the function works the same as before the refactoring. It means you can move on. Look, the function duplicates the code for calculating miles. Expressions differ only in the value of percentages:</p><pre><code>var calculateMiles = function (distance, isBusinessClass) {
if (isBusinessClass) {
return <mark>distance * 0.22</mark>;
}
return <mark>distance * 0.18</mark>;
};</code></pre><p>Let’s take a look at the solution from a different angle: what if we calculated percentage in the conditions, rather than duplicating mile calculation? We can reformulate the task so that the base percentage is 18, and if we fly business class, the percentage is increased by 4. Then at the end of the function, we calculate and return miles once.</p><pre><code>var calculateMiles = function (distance, isBusinessClass) {
<mark>// Enter percentage</mark>
if (isBusinessClass) {
<mark>// Change percentage</mark>
}
<mark>// Calculate and return miles</mark>
};</code></pre><p>The second step of refactoring is as follows: create variable <code>percent</code>, which will vary depending on the condition, and return the result of the expression <code>distance * percent</code> from the function.</p><p>This way the code is easier to understand, and there will be only one exit point from the function. The function will become easier to read, because the conditions for changing percentages can now be made not nested, but sequential.</p><p class="info info--gray"><span class="info__heading">By the way,</span> the exit point from the function is the place where the function completes its work and logs the result.</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 calculateMiles = function (distance, isBusinessClass) {
if (isBusinessClass) {
return distance * 0.22;
}
return distance * 0.18;
};
var milesEconom = calculateMiles(3000, false);
var milesBusiness = calculateMiles(3000, true);
console.log('With economy class from MuffAir, you’ll get ' + milesEconom + ' miles');
console.log('With business class of MuffAir, you’ll save ' + milesBusiness + ' miles');
</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/functions/optimization/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aed50c7ecbf"><input type="hidden" name="csrf_value" value="81a4ded5e2bcab62354db46981370bc9"><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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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/functions/add-percent" title="Just add percentage"><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 body of the function, it the very beginning, create variable <code>percent</code> equal to <code>0.18</code> on the 2nd line.</li><li class="course-goals__list-item">Inside the condition, instead of calculating miles, increase variable <code>percent</code> by <code>0.04</code><span class="mark">.</span></li><li class="course-goals__list-item">Replace the expression that the function returns with <code>distance * percent</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
src="https://assets.htmlacademy.org/scripts/courses-spa/htmlacademy-task.v43.js"
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