Knowledge Base

Snigdha Paul December 28, 2024 No Comments

What is the use of $1, $2, … etc in regex?

$1, $2 refers the capturing groups. $1 means first capturing group$2 means first capturing group…. etc.These are mainly used for replacement. Lets see an exampleWe…

Anirban Poddar December 28, 2024 No Comments

How to use ::before and ::after pseudo elements in CSS ?

The ::before and ::after pseudo-elements in CSS allows you to insert content on a page or section without having a HTML structure. The html structure will looks like this:…

Saikat Mondal December 28, 2024 No Comments

How to Count Occurrences of an Element in an Array in JavaScript.

JavaScript is a versatile language that offers many powerful methods for working with arrays. One common task developers often need to perform is counting the…

Sandeep Mandal December 28, 2024 No Comments

What is useEffect hook in React and how to use it?

The useEffect hook in React is used to handle side effects in functional components, such as: Fetching data from an API. Manipulating the DOM. Setting…

Rohit Patra December 28, 2024 No Comments

How To The Write `arrayFilter( )` Function In ColdFusion?

Description:- This is used to filter the elements of an array. this will return an array after filtering. arrayFilter( array, function( item [,index, array] ){…

Saikat Mondal December 21, 2024 No Comments

ReferenceError: prompt is undefined. How would I fix this in JavaScript?

To fix this issue prompt is not defined in VS code or prompt is not working, You can follow these steps –1. Open your terminal…

Snigdha Paul December 21, 2024 No Comments

What is the difference between (?=) and (?<=) in regex?

(?=) is used to check if a string (which we want to match) is followed by another string or not.(?<=) is used to check if…

Anirban Poddar December 21, 2024 No Comments

How to use for…in loop in Javascript ?

The for...in loop is used to iterate through the keys of an object. Syntax of JavaScript for…in Loop for (key in object) { // body…

Sandeep Mandal December 21, 2024 No Comments

What is the use of Array.some() method in JavaScript?

Usage: The JavaScript Array some() method is used to check if any elements in an array pass a test provided by a specified function. Example:…

Rohit Patra December 21, 2024 No Comments

How To The Write `<cffile action=”write”>` Function In ColdFusion?

Description:- Writes a text file on the server, based on dynamic content. You can create static HTML files from the content, or log actions in…