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Interactive online courses HTML Academy
2026-03-09 10:47 Diff
https://htmlacademy.org/courses/javascript-programming/objects/use-map
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Minimum of boring theory and lots of practical tasks."><meta name="twitter:image" property="og:image" content="https://htmlacademy.org/og/htmlacademy.png"><meta name="twitter:card" content="summary_large_image"><link rel="canonical" href="https://htmlacademy.org/courses/javascript-programming/objects/use-map"><meta name="theme-color" content="#2f358f"></head><body class="course-interface course-interface--light" data-base="/assets/courses/7/"><header class="page-header page-header--course"><div class="page-header__inner"><div class="page-header__top"><a class="page-header__logo" href="/" aria-label="HTML Academy Home"><img src="https://assets.htmlacademy.org/img/logo--small.svg?cs=1218aec0be4a5f23db79ad29a14e30f7f9fb9a25" width="24" height="36" alt="HTML Academy"></a><nav class="main-nav main-nav--mini" role="navigation"><div class="main-nav__course-nav"><a class="main-nav__course-item main-nav__course-button main-nav__course-button--prev" href="/courses/javascript-programming/objects/map">Object as a dictionary</a><div class="main-nav__course-item main-nav__course-list main-nav__course-list--collapsed"><b class="main-nav__course-title">Objects</b><span class="main-nav__course-stat">26/30</span><div class="main-nav__course-contents"><a class="main-nav__course-contents-link" href="/courses/javascript-programming/objects">Back to the list of tasks</a><ul class="main-nav__course-contents-list"><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/game-start">1. Shall we play?</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/add-players">2. Players, let’s start!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/first-throw">3. My attempt number one</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/hello-object">4. Hello, object!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/read-object">5. Reading from the object</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/add-array">6. Count off!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/overwrite-property">7. Overriding object properties</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/pass-by-reference">8. Passing object by a link</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/game-rules-object">9. My game</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/add-attempts">10. Giving out the attempts</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/search-winner-start">11. Who is the winner?</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/loop-in-loop">12. Announce the entire list, please</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/add-if">13. Looking for a cat with great results</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/array-push-winners">14. No one will hide</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/else-if">15. New conditions</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/same-result">16. Hard to come across</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/print-winners">17. Let’s bring it all to light</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/add-new-player">18. Roll the dice, gentlemen cats!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/edit-message">19. Let’s make adjustments</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/summary-1">20. Summary of “Objects”. Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/challenge-1">21. Tenth program: “Golden ball”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/comp-config">22. Build it yourself!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/first-method">23. My first method</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/methods-implementation">24. Implementing methods</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/map">25. Object as a dictionary</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/objects/use-map">26. Bracket notation</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/this">27. Let’s not forget about the context</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/add-another-computer">28. Store check</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/summary-2">29. Summary of “Objects”. Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/objects/challenge-2">30. Eleventh program: “The house that Muffin built”</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-programming/objects/this">Let’s not forget about the context</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%2Fobjects%2Fuse-map" 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" 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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">Bracket notation</h1><div class="course-theory__content-text"><p>Did you notice something unusual in the example of working with the dictionary?</p><pre><code>var catsFavoriteFood = {
  Muffin: 'fish',
  Rudolph: 'cutlet',
  Snowball: 'milk'
};

var printFavoriteFood = function (name) {
  return 'My favorite food is ' + <mark>catsFavoriteFood[name]</mark>;
};

console.log (printFavoriteFood ('Snowball'));
// Logs 'My favorite food is milk'</code></pre><p>Before, we accessed the properties of an object using a fullstop, and in this example, we work with an object as an array, we read the property using square brackets: <code>catsFavoriteFood[name]</code>. Yes, that’s also possible. The method with brackets is called <em>bracket</em> notation, the method with a dot <em>dot</em> notation. <em>Programmers are so original, right?</em></p><p>Bracket notation is much more flexible than dot notation. For example, you can read from an object a property whose name is written to a variable:</p><pre><code>var name = 'Muffin';
var catsFavoriteFood = {Muffin: 'fish'};

console.log(catsFavoriteFood.name);
// Logs undefined in the console

console.log(catsFavoriteFood[name]);
// Logs 'fish' in the console</code></pre><p>The first message contains <code>undefined</code>, because the object does not have the <code>name</code> property. The second message contains the required value, because the program understands that there is a variable inside the brackets. The value of the variable is placed in the brackets, and then the required property of the object will be found.</p><pre><code>console.log(catsFavoriteFood[name]);
// Inside the program quietly turns into:
console.log(catsFavoriteFood['Muffin']);</code></pre><p>And one more surprise: any strings, even strings with spaces, can be used as keys in an object. Such properties cannot be read with dot notation, but you can definitely do it with no problem with bracket notation.</p><pre><code>var cat = { 'favorite food': 'Milk' };

console.log(cat.favorite food);
// Causes an error

console.log(cat ['favorite food']);
// Works fine</code></pre><p>By the way, why did we take the dictionaries out of the function to the very beginning of the program? Values that are stored in these objects do not depend on the parameters of the function or computer object. These are the rules that apply to the whole program. They can be used in other functions and operations, if necessary. If the dictionaries were in the body of the function, they would be created only when the function was called.</p><p>Why does this even work? The object inside the function sees objects that are declared at the very beginning of the program. This is how scopes work. We will analyze this language feature later on, in other courses.</p><p>Now that the dictionaries have been created, and we learned how to work with them, we can calculate the price of the computer in one line. We will use the <code>getPrice</code> method. We will override it by adding new calculations.</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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                        this.page.url = "https://htmlacademy.org/courses/javascript-programming/objects/use-map";
                        this.page.identifier = "task-172";
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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 processorPrice = {
  &#039;i5&#039;: 5000,
  &#039;i7&#039;: 10000
};

var displayPrice = {
  13: 5000,
  15: 10000
};

var memoryPrice = {
  8: 3000,
  16: 4000
};

var buildComputer = function (memory, display, processor) {
  var computer = {
    basicPrice: 5000,
    processor: processor,
    display: display,
    memory: memory,

    getDescription: function () {
      return &#039;computer with processor &#039; + computer.processor + &#039;, diagonal &#039; + computer.display + &#039;, RAM &#039; + computer.memory;
    },

    getPrice: function () {
      return computer.basicPrice;
    }
  };

  return computer;
};

var myComputer = buildComputer(8, 13, &#039;i7&#039;);
console.log(&#039;In the cart &#039; + myComputer.getDescription() + &#039; that costs &#039; + myComputer.getPrice());
</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/objects/use-map/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aea547ca9ea"><input type="hidden" name="csrf_value" value="229e573e74b91134c286b06af9c63c93"><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/objects/this" title="Let’s not forget about the context"><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">Return <code>computer.basicPrice + processorPrice[computer.processor] + displayPrice[computer.display] + memoryPrice[computer.memory]</code> expression from <code>getPrice</code> method instead of <code>computer.basicPrice</code>.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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