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Web Development Articles
Page 323 of 801
JavaScript: How to check if a number is NaN or finite?
Checking whether a number is NaN (Not a Number) or finite is important while working with numerical computations in JavaScript. NaN (Not a Number) indicates a value that can't be represented as a number, often occurring from invalid operations like dividing zero by zero (0/0). Finite numbers are all real numbers in JavaScript that are neither Infinity, -Infinity, nor NaN. JavaScript provides several built-in methods to determine if a value is NaN (Not a Number) or if a number is finite. In this article, you will understand how to check if a number is NaN or finite using these ...
Read MoreJavaScript Separate objects based on properties
Separating objects based on properties in JavaScript means rearranging a group of objects into a new structure where objects that share the same value for a specific property are placed together. Objects are collections of key-value pairs that store large data as a key with associated information as its value. In JavaScript, you often need to group objects inside a larger object based on certain properties. Separating objects based on properties in JavaScript can be done by writing a simple function using the reduce method. In this article, we will understand how to do this effectively. Understanding the ...
Read MoreHow to find specific words in an array with JavaScript?
Finding specific words in an array is a common task in JavaScript, especially when you need to filter data, search through lists, or analyze text. An array is a simple and fundamental data structure in JavaScript that stores multiple values of the same data type. JavaScript has several built-in methods, like includes(), filter(), and find(), that help you search for specific words easily. This article will explain these methods with examples. Finding Specific Words in an Array Finding specific words in an array can be done in the following ways: Using includes() ...
Read MoreHow to set a String as a key for an object - JavaScript?
In JavaScript, it is common to use a string as a key for an object, especially when you want to dynamically create or change the properties of the object. Objects are fundamental data structures that allow you to store collections of data in key-value pairs. You can use strings as keys directly. It is a simple and straightforward method. This article will guide you how to use a string as a key for an object. Using Computed Property Names (ES6) The most modern approach is using computed property names with bracket notation inside the object literal. This allows ...
Read MoreHow to sort an object in ascending order by the value of a key in JavaScript?
Sorting an object in ascending order by the value of a key is a common task in JavaScript. Objects are data structures, which are a collection of key-value pairs. Since objects in JavaScript are unordered collections, sorting them directly is not possible. This article will guide you on how to sort an object in ascending order by the value of a key in JavaScript. Understanding the Concept Suppose we have the following object: const obj = { "sub1": 56, "sub2": 67, "sub3": 98, "sub4": ...
Read MoreJavaScript - Create an alert on clicking an HTML button
In this article, we will learn to create an alert by clicking an HTML button in JavaScript. JavaScript is extensively utilized to increase user interactions on web pages. One of the widespread usage scenarios is to display an alert on a button click. What is an Alert in JavaScript? An alert is a built-in JavaScript function that displays a small pop-up or a dialogue box window containing a message. The syntax for using an alert is: alert("Your message here"); This function pauses the execution of the script until the user dismisses the alert ...
Read MoreRemoving all non-alphabetic characters from a string in JavaScript
Non-alphabetic characters are any characters that are not part of the alphabet, and the strings are a data type that represents a sequence of characters or text. Working with strings is a basic task in JavaScript, and one common task is removing all non-alphabetic characters from a string. In this article, we will understand how to remove all non-alphabetic characters from a string. Understanding the Problem Suppose we have a string saying "he@656llo wor?ld". We want to remove all digits, punctuation, whitespace, and special characters from the given string. For example: Input string we have: "he@656llo wor?ld" ...
Read MoreChanging the npm start-script of Node.js
The start-script of a Node.js application consists of all the commands that will be used to perform specific tasks. When starting or initializing a Node.js project, there are predefined scripts that will be created for running the application. These scripts can be changed as per the need or demand of the project. Script commands are widely used for making different startup scripts of programs in both Node and React. npm start is used for executing a startup script without typing its execution command. Package.json File Structure The start script needs to be added in the package.json file. ...
Read Moresend(), sendStatus() and json() method in Node.js
In Express.js, the send(), sendStatus(), and json() methods are essential for sending responses to clients. The send() method sends data in string format, json() sends data in JSON format with proper headers, and sendStatus() sends HTTP status codes with default status messages. Prerequisites Node.js installed Basic understanding of Express.js Installation Install the Express module using npm: npm install express Understanding sendStatus() Method The sendStatus() method sends an HTTP status code along with its default message. Common status codes include 200 (OK), 404 (Not Found), 201 (Created), ...
Read MoreAchieving maximum possible pair sum in JavaScript
The maximum possible pair sum is a traditional problem in Data Structures and Algorithms (DSA). In this problem, we calculate the sum of two elements (i.e., pairs) in an array such that the resulting sum is the maximum among all possible pair sums. For example, we have an array [1, 2, 3, 4]. The sum of the pair (3, 4) is 7, which is the maximum among all pair sums in the given array. Problem Statement We have given an array named nums[], and our task is to write a JavaScript program to achieve the maximum possible ...
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