JavaScript
var percent = 0.25;
var distance = 4125;
if (distance > 10500) {
percent = 0.35;
}
var miles = distance * percent;
console.log('We’ll get ' + miles + ' miles for the flight to Irkutsk');
// Delete the code below
var percent = 0.25;
var distance = 11000;
if (distance > 10500) {
percent = 0.35;
}
var miles = distance * percent;
console.log('We’ll get ' + miles + ' miles for the flight to Kamchatka');
Thanks! We’ll fix everything at once!
Result
- Delete the entire code for calculating the miles of the second flight (variables, condition and log in the console).
- Add function declaration for counting miles at the end of the program: var calculateMiles = function () { };.
- Transfer the entire remaining code calculating miles into the body of the calculateMiles function.
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Fasten your seat belts</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/check-miles">2. Long-distance flight</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/kamchatka-miles">3. Going the second circle</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/functions/first-function">4. Helper function</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/function-call">5. Function, I’m calling you!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/parameter">6. I have a parameter for you</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/order-of-parameters">7. Order of parameters</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/return">8. 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"><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. Who is faster?</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/add-array">21. Saving up for a trip around the world</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/summary-2">22. Summary of “Functions”. Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/challenge-calculate-deposit">23. Eighth program: “Money makes money”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/functions/challenge-deposits-condition">24. Ninth program: “The Eternal Question”</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-programming/functions/function-call">Function, I’m calling you!</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%2Ffunctions%2Ffirst-function" 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%2Ffunctions%2Ffirst-function" title="Log in" data-modal="open" data-value="login" itemprop="url"><span class="main-nav__icon" 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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">Helper function</h1><div class="course-theory__content-text"><p>Have you already noticed the problem?</p><p>The program works, miles are calculated, but what happens if Muffin goes all out and decides to fly to a dozen cities more? We will constantly have to copy one part of the code, change the distance, calculate and declare the same variables over and over every time, which violates the rules of the language. Of course, we will cope with the task at hand, but we will spend a lot of time and the code will grow to include hundreds of lines.</p><p>Is there a more convenient and competent way to do calculations without copying? There is! Write a <strong>function</strong>.</p><p>A function is a piece of code that can be written once and then reused. A function, unlike a variable, does not simply contain a value, but performs a certain action and solves a certain task: it calculates, compares, searches. For example, our function will calculate miles accrued for the flight.</p><p>But first, let’s see what the functions consist of and how they are declared (created) in the code.</p><pre><code>var functionName = function () {
// Actions that are performed
// by a function or a body
// of the function
};</code></pre><p><code>functionName</code> is a name of the variable that contains the function. We can access the function using this name and we can use it many times. Let’s assume that the name of a variable is the name of the function.</p><p>There are other ways of creating functions, but we’ll discuss them later, in other courses.</p><p>Creating function is not more difficult than creating <a href="/courses/javascript-programming/conditions" target="_blank">conditions</a> or <a href="/courses/javascript-programming/loops" target="_blank">loops</a>. Use the keyword <code>function</code>, then add parentheses. The curly brackets contain the actions that the function will perform every time we call it. Remember how we did it in the loops? There the code inside <code>{ }</code> is called the <em>body of the loop</em>, and here the <em>body of the function</em>.</p><p>Write the function <code>calculateMiles</code> for calculating miles.</p><p class="info info--gray"><span class="info__heading">By the way,</span> note the name <code>calculateMiles</code>. The function literally <em>calculates miles</em>, that is, <em>does something</em>. It’s a common naming convention: the function name contains a verb. This way it is more convenient for developers to navigate their own and even someone else’s code. Maybe the function was written by your colleague and you have no idea what’s inside. It will be enough for you to look at the function name in order to roughly imagine what it is intended for.</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 distance = 4125;
if (distance > 10500) {
percent = 0.35;
}
var miles = distance * percent;
console.log('We’ll get ' + miles + ' miles for the flight to Irkutsk');
// Delete the code below
var percent = 0.25;
var distance = 11000;
if (distance > 10500) {
percent = 0.35;
}
var miles = distance * percent;
console.log('We’ll get ' + miles + ' miles for the flight to Kamchatka');
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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/function-call" title="Function, I’m calling you!"><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">Delete <strong>the entire</strong> code for calculating the miles of the second flight (variables, condition and log in the console).</li><li class="course-goals__list-item">Add function declaration for counting miles at the end of the program: <code>var calculateMiles = function () { };</code><span class="mark">.</span></li><li class="course-goals__list-item">Transfer the entire remaining code calculating miles into the body of the <code>calculateMiles</code> function<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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