For array intersection, you can try to run the following code in JavaScript −Example                    let intersection = function(x, y) {             x = new Set(x), y = new Set(y);             return [...x].filter(k => y.has(k));          };          document.write(intersection([5,7,4,8], [3,9,8,4,3]));          

The best way to detect a ‘touch screen’ device, is to work around to see whether the touch methods are present within the document model or not.function checkTouchDevice() {    return 'ontouchstart' in document.documentElement; }Here, you can also use it to detect mobile or desktop, like the following −if (checkTouchDevice()) {    // Mobile device } else {    // Desktop }

To set height equal to the dynamic width in JavaScript, you can try to run the following code −Example                    .wrap {             width:400px;             height:300px;             border:2px solid yellow;          }          .myChild{             width: 80%;             border:1px solid red;          }                                  var res = $('.myChild').width();          $('.myChild').css({             'height': res + 'px'          });                                        

To set the style of the font, use the fontStyle property. You can try to run the following code to set the style of the font to normal, italic or oblique with JavaScript −ExampleLive Demo           Heading 1                This is Demo Text. This is Demo Text. This is Demo Text. This is Demo Text.          This is Demo Text. This is Demo Text. This is Demo Text. This is Demo Text.             Set Font Family and Style                function display() {             document.getElementById("myID").style.fontFamily = "verdana,sans-serif";             document.getElementById("myID").style.fontStyle = "italic";          }          

The setInterval() method is used evaluate an expression at specified intervals. This function calls function after every duration milliseconds. This goes for unlimited times. Let’s see an example −It triggers alert(‘Hello’) after every 2000 milliseconds, not only once.setInterval(function() { alert('Hello');}, 2000);To clear the usage of setInterval(), use the window.clearInterval() and set the parameter as the ID, likewindow.setInterval();

The usage of anonymous functions affect performance is the sense, you need to create a new function object at each iteration. Anonymous functions are always loaded using a variable name. Anonymous, as the name suggests, allows creating a function without any names identifier. It can be used as an argument to other functions. Call them using a variable name −ExampleThis is how JavaScript anonymous functions can be used −var func = function() {    alert(‘This is anonymous'); } func();Here’s an example −//anonymous function var a = function() {    return 5; }

Yes, iOS capture onscroll events for a scroll. This is called one-finger events. What the user is tapping or touching decides whether an event is generated or not.Here is panning gesture,Image credit − AppleIt can also be touch and hold gesture,Image credit − Apple

To set the order of the flexible item, relative to the rest of JavaScript, use the order property. You can try to run the following code to implement order property − Example Live Demo #box { border: 1px solid #000000; width: 420px; height: 150px; display: flex; } #box div { height: 80px; width: 80px; } DIV1 DIV2 DIV3 Set function display() { document.getElementById("myID1").style.order = "3"; document.getElementById("myID2").style.order = "1"; document.getElementById("myID3").style.order = "2"; }

To inject JavaScript in WebBrowser control, use the following steps − Firstly, create a Windows Forms application in Visual Studio. Now, drag a WebBrowser control to the form Set the Url property. Right-click the project, choose to Add reference... → COM → Type Libraries Select "Microsoft HTML Object Library"  Add the following code to inject JavaScript.private void myWebBrowser(object sender, WebBrowserDocumentCompletedEventArgs e){      // head element    HtmlElement hElement = weBrowser.Document.GetElementsByTagName("head")[0];    // script element    HtmlElement sElement = weBrowser.Document.CreateElement("script");    IHTMLScriptElement val = (IHTMLScriptElement)sElement.DomElement;    element.text = "function sayHello() {       alert('Weclome')    }";    hElement.AppendChild(sElement);    weBrowser.Document.InvokeScript("How you doing?"); }

Use the alignContent property in JavaScript to set the alignment between the items inside a flexible container.ExampleYou can try to run the following code to implement alignContent property in JavaScript −                    #box {             border: 1px solid #000000;             width: 240px;             height: 150px;             flex-flow: row wrap;             align-content: space-around;             display: flex;          }          #box div {             height: 80px;             width: 80px;          }                              DIV1          DIV2          DIV3             Set                function display() {             document.getElementById("box").style.alignContent = "space-between";          }