JavaScript
var calculateMiles = function (distance, isBusinessClass) {
var percent = 0.18;
if (isBusinessClass) {
percent += 0.04;
}
return distance * percent;
};
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 will save ' + milesBusiness + ' miles');
Thanks! We’ll fix everything at once!
Result
- In the calculateMiles function after checking the flight class, add another check. If the distance is greater than 3500 km, the percentage increases by another 0.15.
- Increase the distance in both function calls to 10000 to make sure that the number of miles has increased.
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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"><a href="/courses/javascript-programming/functions/optimization">14. Make me beautiful</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/functions/add-percent">15. Just add percentage</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/calculate-flights">16. Call me quietly by name</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/add-miles-target">17. I see the target</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/flights-condition">18. How many flights?</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/flights-class-condition">19. Let’s clean up a little</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/which-is-faster">20. 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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 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 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">Just add percentage</h1><div class="course-theory__content-text"><p>The second step of refactoring is now behind us. The console has the same results: 660 miles and 540 miles. Which means that we did not ruin the logic and the refactoring was successful.</p><p>Due to the fact that we refactored our code, writing another <code>if</code> into the function is quite simple:</p><pre><code>var calculateMiles = function (distance, isBusinessClass) {
var percent = 0.18;
if (isBusinessClass) {
percent += 0.04;
}
if (distance > 3500) {
<mark>// Let’s change percentage one more time</mark>
}
return distance * percent;
};</code></pre><p>And what happens if we fail to enter a percentage variable and decrease the number of exits from the function?</p><p><code>calculateMiles</code> code will look very scary. It will be something like this:</p><pre><code>var calculateMiles = function (distance, isBusinessClass) {
if (isBusinessClass && distance > 3500) {
return distance * 0.37;
}
if (isBusinessClass && distance <= 3500) {
return distance * 0.22;
}
if (!isBusinessClass && distance > 3500) {
return distance * 0.33;
}
return distance * 0.18;
};</code></pre><p>Or no less scary. Like this:</p><pre><code>var calculateMiles = function (distance, isBusinessClass) {
if (isBusinessClass) {
if (distance > 3500) {
return distance * 0.37;
} else {
return distance * 0.22;
}
} else {
if (distance > 3500) {
return distance * 0.33;
} else {
return distance * 0.18;
}
}
};</code></pre><p>And this is only for two conditions that affect the mile calculation process. Imagine how cumbersome the code will become if there is one or two new conditions for calculating miles (which in real practice is quite common).</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) {
var percent = 0.18;
if (isBusinessClass) {
percent += 0.04;
}
return distance * percent;
};
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 will 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/add-percent/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aebc859af86"><input type="hidden" name="csrf_value" value="196c2a390b97dbd709173dc4e890978a"><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/functions/calculate-flights" title="Call me quietly by name"><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 <code>calculateMiles</code> function after checking the flight class, add another check. If the distance is greater than <code>3500</code> km, the percentage increases by another <code>0.15</code><span class="mark">.</span></li><li class="course-goals__list-item">Increase the distance in both function calls to <code>10000</code> to make sure that the number of miles has increased.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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