What is JavaScript?

JavaScript is a scripting language. It is different from Java language. It is object-based, lightweight, cross-platform translated language. It is widely used for client-side validation. The JavaScript Translator (embedded in the browser) is responsible for translating the JavaScript code for the web browser.

List some features of JavaScript.

Some of the features of JavaScript are:

Lightweight
Interpreted programming language
Good for the applications which are network-centric
Complementary to Java
Complementary to HTML
Open source
Cross-platform

Who developed JavaScript, and what was the first name of JavaScript?

JavaScript was developed by Brendan Eich, who was a Netscape programmer. Brendan Eich developed this new scripting language in just ten days in the year September 1995. At the time of its launch, JavaScript was initially called Mocha. After that, it was called Live Script and later known as JavaScript.
List some of the advantages of JavaScript.

Some of the advantages of JavaScript are:

Server interaction is less
Feedback to the visitors is immediate
Interactivity is high
Interfaces are richer. learn more advanced skills with the Best Javascript books

List some of the disadvantages of JavaScript.

Some of the disadvantages of JavaScript are:

No support for multithreading
No support for multiprocessing
Reading and writing of files is not allowed
No support for networking applications.

Name the types of functions

The types of function are:

Named - These type of functions contains name at the time of definition. For Example:

function display()
{
  document.writeln("Named Function");
}
display();

Anonymous - These type of functions doesn't contain any name. They are declared dynamically at runtime.

var display=function()
{
  document.writeln("Anonymous Function");
}
display();

Define anonymous function

It is a function that has no name. These functions are declared dynamically at runtime using the function operator instead of the function declaration. The function operator is more flexible than a function declaration. It can be easily used in the place of an expression. For example:

var display=function()
{
  alert("Anonymous Function is invoked");
}
display();

What is the difference between JavaScript and JScript?

Netscape provided the JavaScript language. Microsoft changed the name and called it JScript to avoid the trademark issue. In other words, you can say JScript is the same as JavaScript, but Microsoft provides it. get more with Best javascript books for beginners

What are the key differences between Java and JavaScript? / How is JavaScript different from Java?

JavaScript is a lightweight programming language (most commonly known as scripting language) developed by Netscape, Inc. It is used to make web pages interactive. It is not a part of the Java platform. Following is a list of some key differences between Java and JavaScript

What is BOM?

BOM stands for Browser Object Model. It provides interaction with the browser. The default object of a browser is a window. So, you can call all the functions of the window by specifying the window or directly. The window object provides various properties like document, history, screen, navigator, location, innerHeight, innerWidth,

What is DOM? What is the use of document object?
DOM stands for Document Object Model. A document object represents the HTML document. It can be used to access and change the content of HTML.
How to create an array in JavaScript?
There are 3 ways to create an array in JavaScript.
By array literal
By creating an instance of Array
By using an Array constructor
Let's see a simple code to create an array using object literal.
var emp=["Shyam","Vimal","Ratan"];

What is the output of 10+20+"30" in JavaScript?

3030 because 10+20 will be 30. If there is numeric value before and after +, it treats as binary + (arithmetic operator).

function display()
{
document.writeln(10+20+"30");
}
display(); Advanced your skills best book to learn javascript

Difference between Client side JavaScript and Server side JavaScript?

Client-side JavaScript comprises the basic language and predefined objects which are relevant to running JavaScript in a browser. The client-side JavaScript is embedded directly by in the HTML pages. The browser interprets this script at runtime.

Server-side JavaScript also resembles client-side JavaScript. It has a relevant JavaScript which is to run in a server. The server-side JavaScript are deployed only after compilation.

In which location cookies are stored on the hard disk?

The storage of cookies on the hard disk depends on the OS and the browser.

The Netscape Navigator on Windows uses a cookies.txt file that contains all the cookies. The path is c:\Program Files\Netscape\Users\username\cookies.txt

The Internet Explorer stores the cookies on a file username@website.txt. The path is: c:\Windows\Cookies\username@Website.txt.

What's the difference between event.preventDefault() and event.stopPropagation() methods in JavaScript?

In JavaScript, the event.preventDefault() method is used to prevent the default behavior of an element.

For example: If you use it in a form element, it prevents it from submitting. If used in an anchor element, it prevents it from navigating. If used in a contextmenu, it prevents it from showing or displaying.

On the other hand, the event.stopPropagation() method is used to stop the propagation of an event or stop the event from occurring in the bubbling or capturing phase.

How can you check if the event.preventDefault() method was used in an element?

When we use the event.defaultPrevent() method in the event object returns a Boolean indicating that the event.preventDefault() was called in a particular element.

Are Java and JavaScript same?

No, Java and JavaScript are the two different languages. Java is a robust, secured and object-oriented programming language whereas JavaScript is a client-side scripting language with some limitations.

What is the difference between View state and Session state?

"View state" is specific to a page in a session whereas "Session state" is specific to a user or browser that can be accessed across all pages in the web application.

Learn basic to advanced with the best authors of Best javascript books 2022

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