What is JavaScript and what can it do.

We have given you information about many programming language earlier, but today we will tell you what JavaScript is and why it is used? If you want to become a programmer, then choosing the right language is very important before learning any language. When you search for any information on the Internet, you browse many web pages which are written in different language. Likewise why should you use JavaScript despite being a programming language like Python, Java, PHP, C ++?

 

JavaScript is a powerful scripting language, which is used to create web pages and applications. You should learn it because today as a web technology about 95% of websites are using it. Almost every web developer says that in the coming time, JavaScript has the highest scope.

In this post, we will give you complete information about it so that you understand what you need to know to learn it. So let’s first know what JavaScript is.

Table of contents

What is javascript

JavaScript is called JS in programming language. It is interpreted programming language interpreted with object oriented capabilities. It is also called dynamic computer programming language. Its program is called Script. Using this, you can apply different types of things in web pages. Its scripts can be provided and executed as plain text.

JavaScript is one of the three main technologies of the World Wide Web (WWW), followed by HTML, CSS. All the main websites on the Internet use it. Because it enables interactive web page, that’s why it is used a lot in creating web application. It is very lightweight due to which JavaScript is used as a major part of the web page nowadays.

Initially it was named LiveScript, not JavaScript. But after this, Netscape which is a web services company changed its name and today we know it by the name of JavaScript. Many people think Java and JavaScript are the same language but both are completely different from each other. The reason for their names being the same is that Java was very popular at that time, due to which its name was also kept similar so that people too would consider it the same.

But today JavaScript has become an independent language with its own ECMAScript. Today it can be executed not only in Browser but also in server. If you want to know what the server is, then read this post.

Some Important Points to Understand JavaScript Definition

1. JavaScript is a client-side scripting language. The source code of which is processed by the server instead of the client’s web browser.
2. Using it, you can add HTML to a web page. You can also change the existing content and modify the page style.
3. It was originally developed to add dynamic and interactive elements to websites.
4. It is an open and cross-platform which aims to provide better experience for the user.
5. Just like PHP and ASP, JavaScript code can be inserted anywhere within the Html of a web-page.
6. Cookies can be received with the help of JavaScript and they can also be set. It is also used to ask questions to visitors and perform a massage show.

History (JavaScript)

JavaScript was invented in 1995 by a Netscape communication corporation programmer named Brendan Eich. It took only 10 days to create this scripting language. At that time its initial name was named Mocha, after that it was changed to LiveScript and finally JavaScript.

Although its official name was given as ‘ECMAScript’, people still called it JavaScript. It was first used in Netscape browser version 2.0B3 in Dec 1995. Then in 1998 ECMAScript 2 and 3 was released, which is today’s modern JavaScript.

Nowadays almost all big websites even Google, Facebook also use JavaScript. Netscape had a strong presence in the youth web at the time. Netscape Communicator, which was NCSA’s first browser, became very popular. But later when Microsoft created the internet explorer, its popularity declined significantly.

Some Basics of JavaScript

JavaScript Syntax

JS Syntax refers to a set of rules. Which determines how language will be written by a programmer and interpreted by the browser. JavaScript is implemented in a web page using a JavaScript statement placed within the <script> html tag.

You can place a script tag anywhere within your web page, but the recommended way is that you keep it within the <head> tag. The purpose of using it is that it alerts the browser program to start interpreting all the text used between these tags as script.

JavaScript Variables

JavaScript, like many other programming languages, has variables. It is loosely type, which means that data type is not required to be declared. You can specify any type of literal values ​​for the variable. You must declare this before using Variables in a JavaScript program. These are declared with Var Keyword as follows.

JavaScript Operators

These operators are used to specify the values, compare the values, perform arithmetic operations and much more. For example, 2 + 3 = 5. Here 2 and 3 are called operands and expression ‘+’ is called operator.

JavaScript supports the following operators:

• Arithmetic operators
• Comparison operators
• Assignment operators
• Conditional operators

JavaScript Functions

It is a block of code that is designed to perform a particular task. This eliminates the need to write a code again and again. This helps the programmer to write module code. Before using any functions, we have to define it. To define a function in JavaScript, we write the keyword before the function, then after writing the function name and parameters list, we close the statement in curly bracket.

So these were some JavaScript basics and there are many things in it, which is quite difficult to tell here. Because this post will be very long, that’s why we will tell you below how you can learn them.

What is the use of javascript

JavaScript is one of the most popular programming language in the world. Which is used to add automations, animations and interactivity to web pages. Web developers use JavaScript to make web pages complex. Let’s know what you can do using JavaScript.

Web development is one area where JavaScript is used the most. Because it is a Client scripting language, it is used to create web pages. Most websites use it for verification.

JavaScript is also used well in creating web applications. Initially many programming language was used for the development of technology browser and personal computer. But JavaScript took it to the next level. Due to this, such applications were developed that hardly anyone would have thought about.

Node JS is used to create Web Server. Node JS has many advantages. The servers built by it are very fast and do not use buffering. In addition it is single threaded with event looping which is used in non-blocking manner.

JavaScript is also used in creating mobile applications. The most important thing that only JavaScript can do is to create applications without web contexts. With this help, both Android and iOS applications can be made.

This is some area where JavaScript is used more. Apart from this, it is also used in making Games and Server applications. There are many other things that can do this, but this is the important area.

How to learn javascript

Most people say JavaScript is very difficult to learn, it is also fine to some extent. But if you do not hurry to learn it, instead try to understand it first. So you will not have any problem in learning it. Below are some instructions that will help you learn JavaScript.

Essential tool for learning JavaScript

Code editor – The first and most important tool is the code editor in which you can use Notepad ++ or Atom. It is absolutely free tool.

Web browser – All of you will have a browser in your PC or laptop because with the help of this we will be able to access the web pages created. Better if you use Chrome, Mozilla or Firefox. Remember to update the latest version of your browser.

Firebug tool – This is a web browser extension with the help of which you can do live debugging of HTML, CSS, DOM, XHR and JavaScript of any web page or website. If you use Firefox, then you have to install it directly from google and if you use chrome browser, then it is already available in it.

To use it in Chrome you have to right click with the mouse. After which you will see an option of inspect, as soon as you click on it, the entire coding of the existing page will appear.

Resource for learning JavaScript

To learn this programming language, you should know some resources from where you can easily start learning JavaScript. You can also use many paid resources to learn this. But I will tell you about some online websites that are absolutely free and on them you are given a complete guide of JavaScript.

Below are the names of five such websites from where you can learn JavaScript easily:

Apart from this, you can also learn JavaScript through YouTube videos.

Some Advantage of JavaScript

By now you must have understood “what is JavaScript” and why it is used. So, let’s now tell you some of its benefits, due to which you should learn it.

Let’s know what are some of the main advantages of JavaScript.

1) JavaScript is very fast programming language, it can be run immediately in the client side browser. Unless external resources are required, JavaScript is not used by Network calls on the Backend server. It does not even need to be compiled on the client side, which is why it gets faster speed. Due to its client side, the demand on sever reduces. Which causes the server to load quickly.

2) It is used everywhere. There are many free websites and tools available for learning JavaScript so that you do not have any problem in learning and implementing it.

3) It can be used with Html, CSS, PHP, C ++ or any other language. JavaScript can be inserted into any web page regardless of file extension.

4) It supports all browsers and gives the same result in all. JavaScript syntax is very easy and flexible.

5) Due to its Event based language, many code segments are executed when a certain event occurs in JavaScript. If understood in easy language, a code section is executed when the user clicks on the button or hovers the object.

Although it has many more benefits, but there are so many benefits for a programmer. So hopefully, you must have understood why JavaScript is called future programming languages.

Conclusion

So friends, you know what JavaScript is and how to learn JavaScript? Hopefully by reading this article you will have fully understood what is the use of JavaScript and why it is important to learn it to become a developer? If you have had difficulty in understanding any topic on this post, then you can ask your question in the comment. Your question will be answered immediately.