JavaScript
var usersByDay = [4, 2, 1, 3];
console.log(usersByDay);
// Start loop here
// Sorting from the first element
var currentIndex = 0;
var minValue = usersByDay[currentIndex];
for (var j = currentIndex + 1; j <= usersByDay.length - 1; j++) {
if (usersByDay[j] < minValue) {
minValue = usersByDay[j];
var swap = usersByDay[currentIndex];
usersByDay[currentIndex] = minValue;
usersByDay[j] = swap;
console.log('Swapping ' + swap + ' and ' + minValue);
console.log('Current array: ' + usersByDay);
}
}
console.log('Minimum element ' + minValue + ' is on ' + currentIndex + 'position');
// Complete loop here
// Sorting from the second element
console.log(usersByDay);
currentIndex = 1;
minValue = usersByDay[currentIndex];
for (var j = currentIndex + 1; j <= usersByDay.length - 1; j++) {
if (usersByDay[j] < minValue) {
minValue = usersByDay[j];
var swap = usersByDay[currentIndex];
usersByDay[currentIndex] = minValue;
usersByDay[j] = swap;
console.log('Swapping ' + swap + ' and ' + minValue);
console.log('Current array: ' + usersByDay);
}
}
console.log('Minimum element ' + minValue + ' is on ' + currentIndex + 'position');
// Sorting from the third element
console.log(usersByDay);
currentIndex = 2;
minValue = usersByDay[currentIndex];
for (var j = currentIndex + 1; j <= usersByDay.length - 1; j++) {
if (usersByDay[j] < minValue) {
minValue = usersByDay[j];
var swap = usersByDay[currentIndex];
usersByDay[currentIndex] = minValue;
usersByDay[j] = swap;
console.log('Swapping ' + swap + ' and ' + minValue);
console.log('Current array: ' + usersByDay);
}
}
console.log('Minimum element ' + minValue + ' is on ' + currentIndex + 'position');
Thanks! We’ll fix everything at once!
Result
- Remove the entire code for sorting from the second and third elements.
- Then wrap the entire the code after the second line in a loop that increases the variable currentIndex from zero to usersByDay.length - 2 inclusively. Value of currentIndex must increase by one after each iteration.
- Inside this loop, remove the duplicate declaration of the variable currentIndex.
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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"><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. Writing to an array by index</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/investigation-completed">14. The murderer is a butler!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/summary-1">15. Summary of “Arrays”. Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/cipher-beginner">16. Fifth program: Beginner decryptor</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/vague-suspicions">17. Vague suspicions</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/swap-elements">18. Swapping the elements</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/minimum-element">19. Looking for the minimum element</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/minimum-elemen-found">20. The minimum element is found!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/start-sorting">21. Starting sorting</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/continue-sorting">22. Continue sorting</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/arrays/finish-sorting">23. Finish sorting</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/test-sorting">24. Testing the sorting</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/median-start">25. Median of an odd number of elements</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/median-end">26. Median of an even number of elements</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/investigation-continues">27. Green light</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/investigation-completed-again">28. The murderer is the butler, again!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/summary-2">29. Summary of “Arrays”. Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/arrays/best-jumps-challenge">30. Sixth program: Long jump records</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-programming/arrays/test-sorting">Testing the sorting</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%2Farrays%2Ffinish-sorting" 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%2Farrays%2Ffinish-sorting" title="Log in" data-modal="open" data-value="login" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg 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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">Finish sorting</h1><div class="course-theory__content-text"><p>Program for sorting an array of <em>four</em> elements is ready. Yes, it is inflexible, and it will have to be rewritten for arrays with a different number of elements. But you will be fine, because you already know how to do refactoring.</p><p>In the current implementation, there is a lot of repeating code where only the value of variable <code>currentIndex</code> changes. How to make the structure of the program better?</p><p>You can take a piece of code with a loop that searches and inserts a minimum value to the specified location, and wrap it in another loop. And in this upper, parent loop, increase variable <code>currentIndex</code>.</p><p>Yes. Loops can be nested into each other.</p><p>Note that <code>currentIndex</code> should change not from zero to array length, but from zero array length minus one. Let’s recall the previous task where we finished sorting of the array after reaching the second last element (because the last element automatically turned out to be the maximum one).</p><p>Let’s write the condition to exit the upper loop by analogy with the condition to exit the nested loop:</p><pre><code>// Loop to the second last element
currentIndex <= usersByDay.length - 2
// Loop to the last element
j <= usersByDay.length - 1</code></pre></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 usersByDay = [4, 2, 1, 3];
console.log(usersByDay);
// Start loop here
// Sorting from the first element
var currentIndex = 0;
var minValue = usersByDay[currentIndex];
for (var j = currentIndex + 1; j <= usersByDay.length - 1; j++) {
if (usersByDay[j] < minValue) {
minValue = usersByDay[j];
var swap = usersByDay[currentIndex];
usersByDay[currentIndex] = minValue;
usersByDay[j] = swap;
console.log('Swapping ' + swap + ' and ' + minValue);
console.log('Current array: ' + usersByDay);
}
}
console.log('Minimum element ' + minValue + ' is on ' + currentIndex + 'position');
// Complete loop here
// Sorting from the second element
console.log(usersByDay);
currentIndex = 1;
minValue = usersByDay[currentIndex];
for (var j = currentIndex + 1; j <= usersByDay.length - 1; j++) {
if (usersByDay[j] < minValue) {
minValue = usersByDay[j];
var swap = usersByDay[currentIndex];
usersByDay[currentIndex] = minValue;
usersByDay[j] = swap;
console.log('Swapping ' + swap + ' and ' + minValue);
console.log('Current array: ' + usersByDay);
}
}
console.log('Minimum element ' + minValue + ' is on ' + currentIndex + 'position');
// Sorting from the third element
console.log(usersByDay);
currentIndex = 2;
minValue = usersByDay[currentIndex];
for (var j = currentIndex + 1; j <= usersByDay.length - 1; j++) {
if (usersByDay[j] < minValue) {
minValue = usersByDay[j];
var swap = usersByDay[currentIndex];
usersByDay[currentIndex] = minValue;
usersByDay[j] = swap;
console.log('Swapping ' + swap + ' and ' + minValue);
console.log('Current array: ' + usersByDay);
}
}
console.log('Minimum element ' + minValue + ' is on ' + currentIndex + 'position');
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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/test-sorting" title="Testing the sorting"><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">Remove the entire code for sorting from the second and third elements.</li><li class="course-goals__list-item">Then wrap the entire the code after the second line in a loop that increases the variable <code>currentIndex</code> from zero to <code>usersByDay.length - 2</code> inclusively. Value of <code>currentIndex</code> must increase by one after each iteration.</li><li class="course-goals__list-item">Inside this loop, remove the duplicate declaration of the variable <code>currentIndex</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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