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Articles by Alshifa Hasnain
Page 5 of 23
What Are Whitespace and Line Breaks in JavaScript?
JavaScript like other programming languages permits whitespace and line breaks to make code more readable. While JavaScript generally ignores whitespace, understanding how it handles whitespace and line breaks is crucial for writing clean, maintainable code. What is Whitespace in JavaScript? Whitespace in JavaScript includes spaces, tabs, and newlines. JavaScript's engine ignores excess whitespace, meaning that adding spaces between variables, operators, or keywords doesn't affect code execution. This allows developers to format their code for better readability. Example: Whitespace Ignored The following two code snippets are functionally identical: // With spaces (readable) var employee = ...
Read MoreWhat is the difference between a method and a function?
In this article, we will learn about the difference between a method and a function in JavaScript. While both execute code blocks, the key difference is that a function is standalone code, while a method is a function that belongs to an object. What is a Function? A function is a reusable block of code that can be called anywhere in your program. Functions help create modular code by eliminating repetition. JavaScript functions can be defined using function expressions, arrow functions, or the function keyword. Syntax function functionName(parameter1, parameter2) { ...
Read MoreJavaScript closures vs. anonymous functions
In this article, we will learn about JavaScript's closures and anonymous functions. JavaScript is a powerful language that allows developers to write expressive and concise code. Two concepts that often confuse beginners are closures and anonymous functions. While they share some similarities, they serve different purposes and function differently in JavaScript. What are Anonymous Functions? An anonymous function is simply a function without a name. Anonymous, as the name suggests, allows the creation of a function without any name identifier. It can be used as an argument to other functions, assigned to a variable, or immediately invoked. They ...
Read MoreWhen is a CDATA section necessary within a script tag?
When working with JavaScript inside HTML documents, developers may come across the CDATA section. It can be helpful when dealing with older XHTML documents or embedded JavaScript in XML-based markup. What is a CDATA Section? A CDATA (Character Data) section is a special syntax used in XML and XHTML documents to prevent certain characters from being interpreted as markup. It ensures that special characters like Why Was CDATA Used in Tags? In XHTML documents, the XML parser would interpret JavaScript operators like , and & as markup, causing parsing errors. CDATA sections prevented this ...
Read MoreWhat is the !! (not not) operator in JavaScript?
In this article, we will learn about the !! (not not) operator in JavaScript. This double negation forces a value to be evaluated as either true or false. What is the !! Operator? The double negation (!! ) operator is the ! operator twice and calculates the truth value of a value. It returns a Boolean value, which depends on the truthiness of the expression. How It Works The first ! negates the value, converting it to true or false. The second ! negates it again, effectively converting it ...
Read MoreWhat are some JavaScript Development Tools?
One of the major strengths of JavaScript is that it does not require any expensive development tools. You can start with a simple text editor such as Notepad. Since it is an interpreted language inside the context of a web browser, you don't even need to buy a compiler. To make our lives simpler, various vendors have come up with very nice JavaScript editing tools. Some of them are listed here − Code Editors and IDEs A quality code editor is the backbone of any JavaScript development process. Visual Studio Code ...
Read MoreWhat are the advantages of JavaScript?
JavaScript is a dynamic computer programming language. It is lightweight and most commonly used as a part of web pages, whose implementation allows a client-side script to interact with a user and to make dynamic pages. It is an interpreted programming language with object-oriented capabilities. Client-Side (Browser) DOM Manipulation User Interaction Form Validation Dynamic Content ...
Read MoreHow to add a new list element under a \'ul\' using jQuery?
In this article, we will learn to add a new list element under a "ul" using jQuery. jQuery is a popular JavaScript library that simplifies HTML manipulation, event handling, and animations. One of its practical applications is dynamically adding elements to a webpage without requiring a full page reload. Why Use jQuery? DOM (Document Object Model) updating using basic JavaScript might become difficult and needs more than one line of code. jQuery has simplified it through easy selectors and functions. Employing jQuery helps us: Select elements efficiently Handle ...
Read MoreHow do I hide an element when printing a web page?
In this article, we will learn to hide an element when printing a web page using CSS and JavaScript. When printing a web page, you can suppress elements such as navigation menus, advertisements, and interactive elements that you do not require on paper and print only the required information. Syntax @media print { selector { display: none; } } Different Approaches The following are the two different approaches to hiding an element when printing a web page − ...
Read MoreWhat is the order of execution of non-static blocks with respect to a constructor in Java?
In Java, non-static blocks run before the constructor whenever an object is created. If multiple non-static blocks exist, they execute in the order they appear in the class, followed by the constructor. In this article, we will understand this order of execution with the help of examples. What Are Non-Static Blocks in Java? The Non-static blocks are class-level blocks which don't contain a prototype. A non-static block must perform any logic whenever an object is instantiated, regardless of the constructor. The Non-static blocks are automatically called by the JVM for every object creation in the Java stack area. We can ...
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