JavaScript
var expectedUsers = 1000;
var firstDayUsers = 812;
var secondDayUsers = 1360;
var thirdDayUsers = 657;
var fourthDayUsers = 1247;
// Drawing the traffic graph
muffin.plot(
firstDayUsers,
secondDayUsers,
thirdDayUsers,
fourthDayUsers,
expectedUsers
);
// Calculating the average traffic value
var averageUsers = (firstDayUsers + secondDayUsers + thirdDayUsers + fourthDayUsers) / 4;
console.log('Average traffic: ' + averageUsers);
if (averageUsers > expectedUsers) {
console.log('Traffic is amazing. Keep up the good work!');
} else {
console.log('Traffic is so-so. You need to try harder!');
}
Thanks! We’ll fix everything at once!
Result
- Instead of calculating the average value, assign the variable averageUsers value 0.
- Before the muffin.plot() command, add variable usersByDay with value [812, 1360, 657, 1247].
- Inside muffin.plot(), set usersByDay as first parameter, expectedUsers as second parameter and delete the remaining parameters.
- Feel free to delete variables firstDayUsers, secondDayUsers, thirdDayUsers and fourthDayUsers.
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Little Muffin and Big Data</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/average-value">2. Average value</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/analizer-almost-ready">3. Finishing the traffic analyzer</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/new-datum">4. New data</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/arrays/massive-data">5. A lot of data? An array!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/read-from-array">6. Reading from an array using index</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/variable-as-index">7. Variable as index</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/array-length">8. Array length</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/loop-through-array">9. Let’s hit arrays with loops!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/sum-in-loop">10. Summation in the loop</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/average-with-array">11. Finishing refactoring</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/one-little-investigation">12. One small analytical investigation</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/write-by-index">13. 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2.854-.492.19-1.003.333-1.524.427-.616.09-1.237.15-1.86.177-3.06-.354-3.607-3.636-3.607-3.636zm23.6.51s-3.72-.52-4.772-.082c-1.16.554-2.038 1.564-2.426 2.79l1.44.52c.604.18 1.23.266 1.86.26 3.18-.195 3.897-3.487 3.897-3.487zm-7.03 2.605c.27.084 1.16.428 1.44.52.53.155 1.076.242 1.627.26h.186c2.706-.083 3.608-2.854 3.72-3.29-1.053-.157-2.116-.235-3.18-.233-.487-.017-.973.042-1.442.176-1.128.46-1.992 1.402-2.35 2.567z" fill="#FFF"/><path d="M32.223 43.26c-.152-1.397-.03-2.81.363-4.157 0 0 .93-2.94 2.343-3.2 3.72-.687 4.054 7.44 4.054 7.44-4.334 1.906-6.76-.084-6.76-.084z" fill="#F47741"/><path d="M45.204 44.292c-.508-.698-1.296-1.14-2.157-1.21-1.71-.176-7.56 1.126-7.56 1.126v.065c-.772-.205-5.98-1.6-7.56-1.45-.875.04-1.692.45-2.25 1.125-.446.864.084 2 .55 2.938.74 1.35 1.788 2.505 3.058 3.375.48.332 1.045.513 1.627.522 4.492.084 4.77-2.585 4.77-2.464l.075-.465c.186 0-.363 2.79 4.054 2.79.542.102 1.1.073 1.628-.084 1.305-.853 2.39-2 3.17-3.35.41-.92 1.043-1.96.596-2.918z" fill="#EFA75B"/><path d="M31.963 50.968c-.197-.004-.358-.157-.372-.353-.018-.207.158-.378.364-.354 3.245-.26 3.505-2.156 3.608-2.25-.006-.19.183-.325.362-.26.193.01.35.16.363.354 0 .084 0 1.906 3.422 2 .192.008.348.16.362.353-.018.19-.172.34-.363.353-1.352.11-2.68-.4-3.61-1.386-.095-.096-.16-.22-.185-.353-.982 1.174-2.423 1.866-3.952 1.898z" fill="#151841"/><path d="M32.14 43.427c.186-.52 3.608.083 3.608.083s2.975-.688 3.422.084c-.05.288-.175.557-.363.78-.515-.056-1.037.004-1.525.178-.333.61-.488 1.304-.446 2-.222.394-.574.7-.995.864-.398-.112-.75-.354-.994-.688.047-.75-.146-1.496-.55-2.13-.27-.26-1.264.084-1.626-.083l-.53-1.088zm6.89.242c-.05.286-.175.556-.363.78-.503-.063-1.015-.012-1.497.148-.333.612-.487 1.305-.446 2-.222.394-.574.7-.995.864-.4-.112-.75-.354-.996-.688.053-.76-.14-1.515-.55-2.157-.268-.26-1.263.084-1.626-.084-.26-.23-.45-.53-.55-.864" fill="#CF4A27"/><path d="M35.748 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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">A lot of data? An array!</h1><div class="course-theory__content-text"><blockquote><p><em>Muffin was wagging his tail pensively and squinting at your code. Then he took his tired eyes off the monitor, dialed the familiar number on the pager and said with a sigh: “hi team lead, tell this rooky about refactoring”.</em></p></blockquote><p>Surprisingly, the video blog was able to survive long enough, and today Muffin sent us data for the last month:</p><pre><code>817, 1370, 752, 1247, 681, 1120, 915, 1281, 875, 1341, 757, 610, 812, 1170, 769, 1261, 845, 1289, 515, 1247, 845, 1311, 741, 1239, 812, 638, 877, 1242, 1159, 1372</code></pre><p>To analyze this data, you will have to add 26 more variables to the current program. A lot of writing? We are about to get data for the year, too.</p><p>Your program works correctly, but adding new data to it is extremely time-consuming. Therefore, it’s time to refactor. <a href="https://en.wikipedia.org/wiki/Code_refactoring" target="_blank" rel="nofollow noopener">Refactoring</a> is rewriting a program, after which it should work the same way, but be more flexible. The purpose of our refactoring is to reduce the complexity of adding and modifying massive amounts of data.</p><p>Fortunately, there is a way to store <em>massive</em> data. This method is called an array. An array is a <a href="/courses/javascript-programming/intro/data-types" target="_blank">data type</a>, which is a list of elements, each of which has its own sequence number.</p><p>Arrays are created using the so-called <em>literal array</em> or square brackets. Inside the brackets, comma-separated lists contain all values that an array must contain. When you create an array, like any value, you can write it to a variable:</p><pre><code>var numbers = [1, 2, 3, 4, 5];</code></pre><p>In the array you can store any data: strings, Boolean values, numbers and even other arrays.</p><p>We will do refactoring smoothly, without deleting the entire program, but rewriting its parts instead. At the first stage, we get rid of the individual variables for the data:</p><ol><li>Let’s temporarily set the average value to zero.</li><li>Then create an array, in which we transfer the values from the variables.</li><li>And transfer this array to command <code>muffin.plot()</code> instead of variables (fortunately, the command can work with arrays).</li><li>Now, when the variables for the data in the program are no longer used, we can go ahead and delete them.</li></ol></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 expectedUsers = 1000;
var firstDayUsers = 812;
var secondDayUsers = 1360;
var thirdDayUsers = 657;
var fourthDayUsers = 1247;
// Drawing the traffic graph
muffin.plot(
firstDayUsers,
secondDayUsers,
thirdDayUsers,
fourthDayUsers,
expectedUsers
);
// Calculating the average traffic value
var averageUsers = (firstDayUsers + secondDayUsers + thirdDayUsers + fourthDayUsers) / 4;
console.log('Average traffic: ' + averageUsers);
if (averageUsers > expectedUsers) {
console.log('Traffic is amazing. Keep up the good work!');
} else {
console.log('Traffic is so-so. You need to try harder!');
}
</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/arrays/massive-data/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aea4f6ec1d8"><input type="hidden" name="csrf_value" value="1ea122a7ea31456c004e828bf52e6924"><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/arrays/read-from-array" title="Reading from an array using index"><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">Instead of calculating the average value, assign the variable <code>averageUsers</code> value <code>0</code><span class="mark">.</span></li><li class="course-goals__list-item">Before the <code>muffin.plot()</code> command, add variable <code>usersByDay</code> with value <code>[812, 1360, 657, 1247]</code><span class="mark">.</span></li><li class="course-goals__list-item">Inside <code>muffin.plot()</code>, set <code>usersByDay</code> as first parameter, <code>expectedUsers</code> as second parameter and delete the remaining parameters.</li><li class="course-goals__list-item">Feel free to delete variables <code>firstDayUsers</code>, <code>secondDayUsers</code>, <code>thirdDayUsers</code> and <code>fourthDayUsers</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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