Counting pairs with a given sum is a common problem in computer science and is often used in many real-world applications such as cryptography and data compression. The problem is to find the number of pairs in an array that have a sum equal to a given value. In this blog post, we will explore different solutions to this problem and their time and space complexities. Given an array of n integers and a given sum S, find the total number of pairs of elements in the given array with sum is equal to S. Input array[]=[2, 4, ... Read More

We have two approaches to count 1’s in a sorted binary array. The first one is to iterate through the array and count the 1's. The second approach is to use a binary search algorithm to find the first occurrence of 1 in the array. It is important to note that in order to use these approaches, the array must be sorted. In this blog post, we will discuss a JavaScript program to count the number of 1's in a sorted binary array. We will also look at some edge cases and optimization techniques to make the program ... Read More

There are many methods for creating new objects from older ones in JavaScript. Creating a new object with the same keys as an existing object but with all the keys in lowercase is a common use case. When working with data from many sources that have irregular key casing, this can be helpful. We'll look at various JavaScript ways to create new objects with lowercase keys in this blog post. However, before doing so, it's important to remember that while creating a new object with lowercase keys might be helpful when working with data from various sources, it's also ... Read More

Strong programming languages like JavaScript are frequently used to build interactive, dynamic web pages. The loading of images on a website is one of JavaScript's most popular uses. However, loading images might be challenging, particularly when determining whether a load is complete. In this article, we'll go through how to make a JavaScript callback that detects if an image has loaded or not. What is a callback function? A callback function is a function that is invoked after the initial function has finished running and is supplied as an argument to another function. To put it another way, a ... Read More

Utilizing web technologies like JavaScript, HTML, and CSS, you can create cross-platform desktop applications using the popular framework Electron. This article will go over how to use Electron to transform an Angular 4 application into a desktop application. Setting Up Electron Before converting our Angular 4 application to a desktop application, we'll need to set up Electron. Here are the steps to set up Electron − Install Node.js Electron requires Node.js to be installed on your machine. You can download and install the latest version of Node.js from the official website. Install Electron Once Node.js is installed, you can install ... Read More

Electron is a popular framework for building cross-platform desktop applications using JavaScript, HTML, and CSS. In this article, we will explore how to generate PDF files in Electron using the jsPDF library. We will cover the basics of PDF generation, how to install and use the jsPDF library, and how to customize the appearance and content of the PDF. PDF stands for Portable Document Format). PDF is a file format used for representing documents that is independent of the application operating system, software and hardware that were used to create them. PDF files can be opened and viewed on ... Read More

Creating a tab image gallery is a great way to showcase a collection of images on a website. By following the steps outlined in this tutorial, you can easily create a tab image gallery using HTML, CSS, and JavaScript. This gallery can be used to display various images, such as photographs, artwork, or even product images. With a little bit of creativity and customization, you can make the gallery look and function just the way you want it to. Step 1: Create the HTML Structure The HTML structure must be created first in order to construct a tab picture ... Read More

JavaScript allows developers to create and manipulate style tags in order to change the appearance of a webpage. By using the document.createElement() method, the .sheet property, and the .insertRule() and .deleteRule() methods, we can add, modify, and remove CSS rules from a stylesheet. By combining these techniques with event listeners, we can create dynamic and interactive web pages that can change their appearance in response to user interactions. One of the most powerful features of JavaScript is the ability to manipulate the DOM, which is the structure of a web page. One way to manipulate the DOM is by creating ... Read More

Closures, Symbols, WeakMaps, class private fields, and Proxies are a few techniques that can be used to create a private variable in JavaScript. Every technique has benefits and drawbacks, so it's crucial to pick the one that best suits your requirements. Like many other programming languages, JavaScript has the idea of private and public variables. Private variables can only be accessed and changed by code that is also part of the same scope, but public variables can be accessed and changed by any code. Let’s look at the different techniques to create a private variable in JavaScript. Using ... Read More

Promise rejection handlers are a powerful tool in JavaScript for handling errors that occur in asynchronous code. In this article, we will learn how to build a global promise rejection handler in JavaScript and how it might assist your application manage errors. You can detect unhandled promise rejections using the global unhandledrejection event and take the necessary action, like logging the problem to an error tracking service or showing the user a notice. A more understandable and simpler syntax for handling promise rejection is provided by error handling with async-await, but it necessitates that you wrap each async function ... Read More