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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to check whether or not a browser tab is currently active using JavaScript?
Users can open multiple tabs in the browser, and they can also check if any particular tab is currently active or not in the browser. For example, if you have given a proctored test, you can observe that it detects that tab is changed whenever you change the tab in the browser. So, there can be many applications and uses for checking whether the browser tab is active. This tutorial will teach us two methods to check whether the browser's tab is active. Using the onblur() and onfocus() methods of the window object The window object contains ...
Read MoreHow to check if a number evaluates to Infinity using JavaScript?
In JavaScript, when we divide any number by zero, we get the infinity value. Also, developers can make a mistake in writing mathematical expressions which evaluate to Infinity. Before performing any operation with the returned value from mathematical expressions, we need to check if the number value is finite. Here, we will learn three approaches to check if a number evaluates to Infinity using JavaScript. Comparing with Number.POSITIVE_INFINITY and Number.NEGATIVE_INFINITY In JavaScript, the Number object contains POSITIVE_INFINITY and NEGATIVE_INFINITY properties that represent positive and negative infinity values. We can compare our numerical value with these properties to ...
Read MoreHow to store data to DOM?
Storing data in the DOM means keeping data associated with HTML elements or in JavaScript variables that can be accessed later. This is useful for maintaining application state, form data, or temporary values without making server requests. In vanilla JavaScript, we can store data in objects or use element properties. jQuery provides the data() method for attaching data to specific DOM elements. Let's explore both approaches. Using JavaScript Objects to Store Data The most common approach is creating JavaScript objects to hold data. This keeps information organized and easily accessible. Syntax let dataObj = ...
Read MoreJavaScript Program for Clockwise rotation of Linked List
In JavaScript, a clockwise rotation of a linked list moves the last k elements to the front. This operation is commonly used in data structure manipulations and algorithm problems. Given a linked list and a rotation count k, we need to move the last k nodes to the beginning. For example, rotating 1 → 2 → 3 → 4 → 5 clockwise by 2 positions results in 4 → 5 → 1 → 2 → 3. Structure of Linked List First, we'll create a Node class and helper functions to build and display the linked list: ...
Read MoreJavascript Program for Range Queries for Frequencies of array elements
We are given an array that will contain integers and another array will be given that will contain the queries and each query represents the range that we are given by the leftmost and the rightmost index in the array and an element. For that range or the subarray, we have to find the frequency of the given element present in that range. The frequency of the elements means that we have to tell for each integer present in that range how many times it occurs. For example − If, the given array is: [5, 2, 5, 3, ...
Read MoreHow to store JavaScript functions in a queue and execute in that order?
In JavaScript, you may need to store functions in a queue and execute them in a specific order. Since JavaScript doesn't have a built-in queue data structure, we can use arrays with push() to enqueue functions and shift() to dequeue them. This pattern is useful for managing asynchronous operations, implementing task schedulers, or controlling execution flow in applications. Basic Queue Operations A function queue uses these core operations: Enqueue: Add function to the end using push() Dequeue: Remove and execute function from the front using shift() Execute: Call functions in First-In-First-Out (FIFO) order ...
Read MoreJavaScript program for Sort the given matrix
Sorting a given matrix using JavaScript is a fundamental operation in programming. Sorting is the process of arranging the elements of a collection or matrix in a particular order. It is essential to make searching and other operations more efficient. In this article, we will discuss how to sort a given matrix using the JavaScript programming language. Problem Statement Given an n x n matrix, we need to sort all elements so that the matrix follows "strict order" - each row is sorted in ascending order, and for any row i where 1 ≤ i ≤ n-1, ...
Read MoreHow to Filter Object by Values in Lodash?
Sometimes we are given an object and we want to extract only the key-value pairs that meet certain criteria. In this article, we are going to discuss how we can filter objects by values in Lodash. Prerequisite Lodash: Lodash is a popular JavaScript library used to deal with a variety of functions such as arrays, objects, strings, and more. Install Lodash We can install the Lodash library in the project by adding it via CDN or npm using the following command: npm install lodash Approaches to Filter Object ...
Read MoreJavaScript Program for Sorting a Linked List of 0s, 1s, And 2s
In this tutorial, we will learn the JavaScript program for sorting a linked list of 0s, 1s, and 2s. Sorting algorithms are essential for any programming language, and JavaScript is no exception. Sorting a linked list of 0s, 1s, and 2s is a common problem that developers encounter in coding interviews and real-world applications. So, let's dive in and explore how to sort a linked list of 0s, 1s, and 2s using JavaScript programming. What is Sorting? Sorting is the process of arranging elements in a specific order, either ascending or descending. It is a fundamental operation ...
Read MoreHow to Convert URL Parameters to JSON in JavaScript?
When working with URLs you will often encounter query parameters that add additional information to the base URL. It may be helpful for developers whenever they need to convert these URL parameters to JSON format, especially for reading and manipulating data. Here we will explore different methods to convert URL parameters to a JSON format in JavaScript including built-in methods and custom solutions using split, reduce, and regular expressions. Understanding URL Parameters URL parameters (query string) follow the ? character in a URL, with each key-value pair separated by &. Here's an example URL: https://example.com/page?name=Pankaj&age=20&city=Surat ...
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