JavaScript
var food = 'salad';
var collectContainer = function (food) {
return function () {
console.log('I ate ' + food);
};
};
var schoolkidFirst = collectContainer('pasta');
Thanks! We’ll fix everything at once!
Result
- Create a similar variable schoolkidSecond after the schoolkidFirst variable. Pass the string 'dumplings' as an argument.
-
Then below it redefine the value of the global variable food to 'celery'.
- Then call the function from the schoolkidFirst variable.
- Below that call the function from the schoolkidSecond variable.
- Let’s now break our closure by removing the food parameter from the collectContainer function. Let’s feed our students celery! Mu-ha-ha!
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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">Let’s prepare for school</h1><div class="course-theory__content-text"><p>Everything works. Global variables do not affect the function in any way.</p><p>Our example works, but it is tightly associated with the value inside the <code>collectContainer</code> function. Maybe the student doesn’t want to just eat pasta every time? We need to offer him a choice. And more often than not, we pass some values to the function, and we do not rigidly record them inside the local scope. Add a parameter to the <code>collectContainer</code> function.</p><pre><code>
var collectContainer = function (<mark>food</mark>) {
return function () {
console.log('I ate ' + <mark>food</mark>);
};
};
var schoolkid = collectContainer(<mark>'pasta'</mark>);
schoolkid();
// Outputs: I ate pasta.
</code></pre><p>Now the value of <code>food</code> will be taken from the parameter, and not from the local variable of the <code>collectContainer</code> function. Everything will work exactly the same. The function that <code>collectContainer</code> returns will remember the value of the parameter and use it when it makes a call.</p><p>We made the internal function anonymous because the name <code>eatDinner</code> is not used anywhere. It does not affect the operation of the function in any way.</p><p>Imagine now that we have two students. Each of them brings a lunchbox of food from home.</p><p>Make sure that when the global variables are redefined that it does not affect the operation of our <code>collectContainer</code> function.</p><p>Note that each time that we call the <code>collectContainer</code> function and write the result to a variable, a new closure is created in the memory that will remember the value of the <code>food</code> parameter at the time that it is created.</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 food = 'salad';
var collectContainer = function (food) {
return function () {
console.log('I ate ' + food);
};
};
var schoolkidFirst = collectContainer('pasta');
</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-browser/events/school-prepare/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aea707aef34"><input type="hidden" name="csrf_value" value="1968b8a4c927f260a513b679ac85849e"><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>
Autorun
</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-browser/events/fix-gallery" title="Fixing the gallery"><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">Create a similar variable <code>schoolkidSecond</code> after the <code>schoolkidFirst</code> variable. Pass the string <code>'dumplings'</code> as an argument<span class="mark">.</span></li><li class="course-goals__list-item"><b>Then below it</b> redefine the value of the global variable <code>food</code> to <code>'celery'</code><span class="mark">.</span></li><li class="course-goals__list-item">Then call the function from the <code>schoolkidFirst</code> variable<span class="mark">.</span></li><li class="course-goals__list-item">Below that call the function from the <code>schoolkidSecond</code> variable<span class="mark">.</span></li><li class="course-goals__list-item">Let’s now break our closure by removing the <code>food</code> parameter from the <code>collectContainer</code> function. Let’s feed our students celery! Mu-ha-ha!</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
src="https://assets.htmlacademy.org/scripts/courses-spa/htmlacademy-task.v43.js"
data-task-type="js"
data-assets-path="https://assets.htmlacademy.org/scripts/courses-spa/"
data-lang="en"
></script><script>HtmlacademyTask.setRoutes({task:'/courses/javascript-browser/events/school-prepare',check:'/courses/javascript-browser/events/school-prepare/check'});</script><script>HtmlacademyTask.setup(function(){this.setView(JsView),this.setRunner(JsRunner),this.setChecker(JsChecker,function(){this.setMatcher(function(o){o.goal("var.schoolkid-2").code('"#builtin.anything"; var schoolkidFirst = "#builtin.anything"; var schoolkidSecond = collectContainer(\'dumplings\'); "#builtin.anything"').goal("change.food").code('"#builtin.anything"; var schoolkidSecond = collectContainer(\'dumplings\'); food = "celery"; "#builtin.anything"').goal("call.schoolkid-1").code('"#builtin.anything"; food = "celery"; schoolkidFirst(); "#builtin.anything"').goal("call.schoolkid-2").code('"#builtin.anything"; food = "celery"; schoolkidFirst(); schoolkidSecond(); "#builtin.anything"').goal("remove.parameter").code('"#builtin.anything"; var collectContainer = "#fn.no.parameter"; "#builtin.anything"').fragment("fn.no.parameter",function(o,t){return o.listOrNode(o.aFunction({params:[]}))(t)})}),this.addGoal("var.schoolkid-2"),this.addGoal("change.food"),this.addGoal("call.schoolkid-1"),this.addGoal("call.schoolkid-2"),this.addGoal("remove.parameter")}),this.setAnswers([{goal:1,editor:"js",data:function(){this.tooltip("Declare a variable <code>schoolkidSecond</code>").at(9).add("var schoolkidSecond = collectContainer('dumplings');\n")}},{goal:2,editor:"js",data:function(){this.tooltip("Redefine the <code>food</code> variable").at(10).add("food = 'celery';\n")}},{goal:3,editor:"js",data:function(){this.tooltip("Call the <code>schoolkidFirst()</code> function").at(11).add("schoolkidFirst();\n")}},{goal:4,editor:"js",data:function(){this.tooltip("Call the <code>schoolkidSecond()</code> function").at(12).add("schoolkidSecond();\n")}},{goal:5,editor:"js",data:function(){this.tooltip("Remove the parameter from the <code>collectContainer()</code> function").at(2).find("food").remove()}}])});</script><footer class="page-footer page-footer--tiny"><div class="page-footer__inner"><p><a href="/docs/cookies">Cookies</a> ∙
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