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Articles by Amit Sharma
27 articles
How to create a valid HTML document with no and element?
With HTML, the essential elements are the doctype declaration, , , and . However, you will be amazed to know that a valid HTML document can work without the , , and elements. The doctype declaration should always be included since it tells and instructs the browser about the document type. Why This Works Modern browsers are designed to be fault-tolerant and will automatically insert missing HTML structure elements when parsing the document. When the browser encounters content without explicit , , or tags, it creates these elements in the DOM tree automatically. ...
Read MoreHow to refresh a page in Firefox?
To refresh a page in a web browser like Firefox means reloading the page. It's quite easy to refresh a page using several different methods. Method 1: Using the Refresh Button Open the web page which you want to refresh. The refresh button is located on the top right corner of the Firefox web browser - it's the circular arrow icon. https://example.com ...
Read MoreHow can I pop-up a print dialog box using JavaScript?
To pop-up a print dialog box using JavaScript, use the window.print() method. This method opens the browser's print dialog, allowing users to select printing options like printer choice, page range, and paper size. Syntax window.print(); Basic Example Here's a simple example that opens the print dialog when a button is clicked: Print Dialog Example My Document This content will be printed when you click the print button. ...
Read MoreWhat is increment (++) operator in JavaScript?
The increment operator (++) increases a numeric value by one. It comes in two forms: pre-increment (++variable) and post-increment (variable++), which behave differently in expressions. Syntax ++variable // Pre-increment: increment first, then return value variable++ // Post-increment: return value first, then increment Pre-increment vs Post-increment let a = 5; let b = 5; ...
Read MoreWhat is the best way of declaring multiple Variables in JavaScript?
JavaScript offers multiple ways to declare variables. While both methods are valid, they have different advantages depending on your use case. Method 1: Separate Declarations (Recommended) Declaring each variable separately is generally the most maintainable approach: var variable1 = 5; var variable2 = 3.6; var variable3 = "Amit"; console.log("variable1:", variable1); console.log("variable2:", variable2); console.log("variable3:", variable3); variable1: 5 variable2: 3.6 variable3: Amit Method 2: Comma-Separated Declaration You can declare multiple variables in a single statement using commas: var variable1 = 5, variable2 = 3.6, ...
Read MoreWhich data is stored in var and how its content is changed in JavaScript?
JavaScript variables declared with var are dynamically typed, meaning they can store any type of data and their type can change during execution. The variable itself doesn't have a fixed type, but the value it holds does. Dynamic Typing in JavaScript Unlike statically typed languages, JavaScript allows the same variable to hold different data types throughout its lifetime. This flexibility is both powerful and requires careful handling. Example: Variable Type Changes var a; ...
Read MoreMust you define a data type when declaring a variable in JavaScript?
In JavaScript, variables are defined using the var keyword followed by the variable name. Before you use a variable in a JavaScript program, you must declare it. Variables are declared with the var keyword as follows. var rank; A data type isn't needed in JavaScript. Variables in JavaScript are not handled like other strong typed language C++, Java, etc. Storing a value in a variable is called variable initialization. You can do variable initialization at the time of variable creation or at a later point in time when you need that variable. Dynamic Typing Example ...
Read MoreHow to declare boolean variables in JavaScript?
A boolean variable in JavaScript has two values: true or false. Boolean values are essential for conditional logic, comparisons, and control flow in JavaScript applications. Syntax let variableName = true; // or false let variableName = Boolean(value); // converts value to boolean Direct Boolean Assignment The simplest way to declare boolean variables is by directly assigning true or false: Boolean variable examples: Show Boolean Values ...
Read MoreIs it better to have one big JavaScript file or multiple light files?
When building web applications, you'll face the decision between using one large JavaScript file or splitting code into multiple smaller files. The choice depends on your project type, build process, and performance requirements. Single File Approach Combining JavaScript into one file reduces HTTP requests and simplifies deployment. This approach works well for single-page applications (SPAs) where all code is needed upfront. // Example: Combined file structure // app.bundle.js contains: // - Core utilities // - UI components // - Business logic // - Third-party libraries Benefits: Fewer HTTP requests Better compression ...
Read MoreWhat are the rules for JavaScript's automatic semicolon insertion (ASI)?
JavaScript's automatic semicolon insertion (ASI) is a feature that automatically inserts missing semicolons in your code. Understanding ASI rules helps prevent unexpected behavior and syntax errors. Statements Affected by ASI The following JavaScript statements are affected by automatic semicolon insertion: empty statement var statement expression statement do-while statement continue statement break statement return statement throw statement Core ASI Rules JavaScript follows these rules when deciding where to insert semicolons: Rule 1: Offending Token A semicolon is inserted before a token that cannot be parsed according to grammar rules, if: ...
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