Category: Javascript Faqs

The ‘this’ keyword in JavaScript refers to the currently calling object. It is commonly used in constructors to assign values to object properties.

The scope of a variable implies where the variable has been declared or defined in a JavaScript program. There are two scopes of a variable: Global Scope Global variables, having global scope are available everywhere in a JavaScript code. Local Scope Local variables are accessible only within a function in which they are defined.

Built-in Method Values Date() Returns the present date and time concat() Joins two strings and returns the new string push() Adds an item to an array pop() Removes and also returns the last element of an array round() Rounds of the value to the nearest integer and then returns it length() Returns the length of…

Here is a very simple way of creating arrays in JavaScript using the array literal: var a = []; var b = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’];

Since JavaScript is essentially an object-oriented scripting language, it supports and encourages the usage of objects while developing web applications. const student = {     name: ‘John’,     age: 17 }

These are the advantages of JavaScript: Enhanced Interaction JavaScript adds interaction to otherwise static web pages and makes them react to users’ inputs. Quick Feedback There is no need for a web page to reload when running JavaScript. For example, form input validation. Rich User Interface JavaScript helps in making the UI of web applications…

These are the features of JavaScript:

These are the different types of data that JavaScript supports:

JavaScript Java JavaScript is an object-oriented scripting language. Java is an object-oriented programming language. JavaScript applications are meant to run inside a web browser. Java applications are generally made for use in operating systems and virtual machines. JavaScript does not need compilation before running the application code. Java source code needs a compiler before it…

JavaScript is a popular web scripting language and is used for client-side and server-side development. The JavaScript code can be inserted into HTML pages that can be understood and executed by web browsers while also supporting object-oriented programming abilities.