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Articles by Kalyan Mishra
Page 4 of 6
How to Test JavaScript Code Automatically?
Testing JavaScript code automatically helps ensure our code works as intended and catches bugs early in development. This article covers the main types of automated testing and popular frameworks for JavaScript applications. Types of JavaScript Testing Unit Testing Unit testing verifies individual functions, modules, or components in isolation. The goal is to test the smallest pieces of code to ensure they work correctly. Popular JavaScript unit testing frameworks include Jest and Mocha. Integration Testing Integration testing verifies how different parts of your JavaScript code work together. It ensures that various components interact properly when combined. Frameworks like ...
Read MoreAs a developer, how much do you use JavaScript?
JavaScript is an object-oriented, interpreted scripting language that serves as the backbone of modern web development. It's primarily a client-side scripting language used to create dynamic and interactive websites. While HTML structures web content and CSS handles styling, JavaScript adds functionality like interactivity, animations, and real-time user experiences. Beyond web browsers, JavaScript has expanded into mobile application development, server-side implementation, and game development. Developers frequently use JavaScript with popular front-end frameworks like React.js, Angular.js, and Vue.js to build complex, dynamic web applications. In full-stack development, JavaScript powers both front-end interfaces and back-end services through Node.js. Why We Need ...
Read MoreHow to check two numbers are approximately equal in JavaScript?
In JavaScript, determining if two floating-point numbers are "approximately equal" is essential because of precision issues with decimal calculations. We compare the absolute difference between two numbers against a tolerance value called epsilon. Why Use Approximate Equality? Floating-point arithmetic can produce unexpected results: console.log(0.1 + 0.2); // 0.30000000000000004 console.log(0.1 + 0.2 === 0.3); // false 0.30000000000000004 false The Algorithm We calculate the absolute difference between two numbers and compare it with epsilon (tolerance). If the difference is less ...
Read MoreHow to create HTML list from JavaScript array?
In this tutorial, we will explore multiple ways to create an HTML list from a JavaScript array. While you can manually create HTML lists using ul (unordered list) and li (list item) tags, this becomes impractical when dealing with dynamic data or large arrays. JavaScript provides efficient methods to dynamically generate HTML lists from array data. Let's examine three different approaches to accomplish this task. Method 1: Using the for Loop The simplest approach uses a traditional for loop to iterate through the array and create list items dynamically using createElement() and appendChild(). ...
Read MoreHow to build a random quote generator using HTML, CSS, and JavaScript?
In this tutorial, we'll build a random quote generator using HTML, CSS, and JavaScript. The application fetches quotes from an API and displays them in an elegant interface with a button to generate new quotes. Project Overview Our quote generator will include: Clean HTML structure with quote display area Responsive CSS styling with hover effects JavaScript logic to fetch quotes from type.fit API Random quote selection and display functionality HTML Structure First, let's create the HTML template ...
Read MoreHow to swap two array elements in JavaScript?
In this tutorial, we explore different approaches to swap two array elements in JavaScript. For example, we can swap the first and second elements of an array: Input: ["first", "second", "third", "fourth", "fifth"] Output: ["second", "first", "third", "fourth", "fifth"] Here we swapped "first" and "second" values of the array. We will explore three different methods to swap array elements: Using a temporary variable Using Array Destructuring (ES6) Using Array splice() Method Using a Temporary Variable ...
Read MoreHow to Create an Analog Clock using HTML, CSS, and JavaScript?
In this tutorial, we will create a functional analog clock using HTML, CSS, and JavaScript. The clock will display the current time with three hands representing hours, minutes, and seconds that move in real-time. Approach Create the clock structure using HTML with three div elements for the hands Style the clock face and hands using CSS positioning and transforms Use JavaScript's Date object to get current time and calculate hand rotations Update the clock every second using setInterval() Understanding the Time Calculations ...
Read MoreHow to convert 3-digit color code to 6-digit color code using JavaScript?
In this tutorial, we will see how to convert 3-digit color code to 6-digit color code in JavaScript. A 3-digit hex color code represents colors in #RGB format, where each digit controls red, green, and blue values. To convert to 6-digit format, we duplicate each character: #RGB becomes #RRGGBB. For example: 3-digit: #08c 6-digit: #0088cc 3-digit: #f4a 6-digit: #ff44aa Algorithm Step 1: Check if the input length is exactly 3 characters Step 2: Split the string into individual characters using split("") Step 3: Use map() to duplicate each character ...
Read MoreHow to create a string by joining the elements of an array in JavaScript?
In this tutorial, we will see how to create a string by joining the elements of an array in JavaScript. We will explore two different approaches: using the addition operator (+) to manually concatenate elements, and using the built-in join() method, which is the recommended approach. Using the Addition Operator (+) In this approach, we manually loop through the array and concatenate each element with a separator using the addition operator. While this works, it's more verbose than using the built-in join() method. Algorithm STEP 1 − Create an array with ...
Read MoreHow to create notes taking app using HTML, Bootstrap and JavaScript?
In this tutorial, we will create a notes-taking app using HTML, Bootstrap, and JavaScript. HTML provides the structure, Bootstrap handles the styling and responsive design, and JavaScript adds functionality for adding, displaying, and deleting notes with persistent storage. Our application will feature a text area for entering notes, an "Add" button to save notes, and a dynamic list displaying all notes with delete functionality. We'll implement local storage to maintain notes even after page refreshes. Local Storage Overview Local Storage is browser storage that persists data on the user's computer. Unlike session storage, data remains available across ...
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