The Bitwise NOT (~) Operator performs NOT operation on the bits. You can try to run the following code to learn how to work with JavaScript Bitwise NOT Operator.Example                    document.write("Bitwise NOT Operator");          // 7 = 00000000000000000000000000000111          document.write(~7);          

If one of the bits are 1, then 1 is returned when Bitwise OR (|) operator is used.ExampleYou can try to run the following code to learn how to work with JavaScript Bitwise OR Operator.                    document.write("Bitwise OR Operator");          // 7 = 00000000000000000000000000000111          // 1 = 00000000000000000000000000000001          document.write(7 | 1);          

To get the value of the type attribute of a link in JavaScript, use the type property. The type attribute is used to tell that the document is html (text/html) or css (text/css), etc.ExampleYou can try to run the following code to get the value of the type attribute of a link.Live Demo           Qries                var myVal = document.getElementById("anchorid").type;          document.write("Value of type attribute: "+myVal);          

In this tutorial, we will learn how to get the value of the target attribute of a link in JavaScript. The target attribute specifies where to open the linked document or page. By default, its value is set to ‘_self, ’ which means the linked document should open in the same window or tab. It can also have values like ‘_blank, ’ ‘_self, ’ ‘_parent, ’ ‘_top, ’ and ‘frame_name’, where each value defines a different location to open the linked document. Using the target property To get the value of the target attribute of a link in JavaScript, use ... Read More

In today's world, almost every website uses JavaScript. Web applications are becoming more complex and more user-interactive, and this has caused performance issues. It results in a poor user experience, which is not desirable for any web application. Different factors cause poor performance, long loading times, and long response times. In this tutorial, we will discuss all of these factors and how to resolve this issue and improve the performance of JavaScript. Light and Compact Code The first thing to improve the performance of JavaScript is to write light and compact code. The JavaScript code can have multiple modules and ... Read More

If a semicolon is misplaced in JavaScript, then it may lead to misleading results. Let’s see an example, wherein the if statement condition is false, but due to misplaced semi-colon, the value gets printed.Example                    var val1 = 10;          if (val1 == 15) {             document.write("Prints due to misplaced semi-colon: "+val1);          }          var val2 = 10;          if (val2 == 15) {             // this won't get printed             document.write(val2);          }          

Yes, it is a good practice to place all the JavaScript declarations at the top. Let’s see an example −Example           JavaScript String match() Method                        // all the variables declared at top          var str, re, found;                    str = "For more information, see Chapter 3.4.5.1";          re = /(chapter \d+(\.\d)*)/i;          found = str.match( re );          document.write(found );           The following are the valid reasons −Gives a single place to check for all the variables.Helps in avoiding global variablesRe-declarations are avoided.The code is easy to read for others as well.

Use the match() method to match a regular expression against a string in JavaScript. You can try to run the following code to match a regular expression −The following is the parameter −match( param ) − A regular expression object.ExampleYou can try to run the following code to match a regular expression against a string −           JavaScript String match() Method                        var str = "For more information, see Chapter 3.4.5.1";          var re = /(chapter \d+(\.\d)*)/i;          var found = str.match( re );                    document.write(found );          

To get the value of the href attribute of a link in JavaScript, use the href property. It gives you the URL of the linked document in JavaScript.ExampleYou can try to run the following code to get the value of the href attribute of a link.           Qries                var myLink = document.getElementById("anchorid").href;          document.write("Link: "+myLink);          

In this tutorial, we will learn how to display the selected option in a dropdown list with JavaScript. What is a dropdown list? A dropdown list is a switchable menu that enables users to select one item from various options. A drop-down list is generated with the tag is most frequently used in forms to gather user input. After submitting the form, the name attribute must refer to the form's data. The DOM API functions getElementById() and querySelector() can be used to choose a element. The process use the querySelector() function to first select the "button" and "select" ... Read More