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What is JavaScript? – Complete Guide for Beginners

Introduction What is JavaScript

Welcome to JavaScript! In this comprehensive guide, you will see JavaScript definition, its usage, examples, its importance, frequently asked questions, and more.

What is JavaScript? Definition

It is considered one of the most popular programming languages.

First of all, you would have some questions about this programming language in your mind. So, let’s see what type of questions people have in their minds when they start learning JS.

Whenever you visit a website, you have seen sometimes a popup that appears and shows a contact form or a newsletter signup form. Or popup ads like in your smartphones. JS is behind these popups.

Let’s See Some JavaScript Examples

What JavaScript Can Do?

1. JavaScript can change HTML content

By using getElementById method we can change any HTML element content.So, let’s see how:

Example: In the example below, I will create a paragraph with id para and then I create a button in HTML and add some JS in the button. Then, whenever we click on the button the content of the HTML element changes.

Let’s See the Code:

<!DOCTYPE html>
<html lang="en-US">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title> JavaScript Tutorials </title>
</head>
<body>
	
<p id="para">
	It is a long established fact that a reader
	will be distracted by the readable content 
	of a page when looking at its layout. 
</p>
<button onclick="document.getElementById('para').innerHTML=
'The point of using Lorem Ipsum.'">
	click me
</button>
</body>
</html>

Copy the code and paste it into your HTML document and click save and open in your browser to see the result.

Note: I will use inline JavaScript code in HTML if you don’t understand what’s happening then don’t worry we will discuss it in detail in our later chapters.

If you don’t know what is HTML and CSS? then learn HTML and CSS first. You must have knowledge about HTML and CSS.

2. JavaScript can Change HTML Styles

By using getElementById method, we can change HTML attributes values too.

Example: In this example, I will create a paragraph in HTML with id para, then apply some JS to change the styles of the paragraph element. Whenever I click on the button the color of the text changes.

<!DOCTYPE html>
<html lang="en-US">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title> JavaScript Tutorials </title>
	<link rel="stylesheet" href="style.css" type=text/css>
</head>
<body>
	
<p id="para" style="color: blue;">
	It is a long established fact that a reader
	will be distracted by the readable content 
	of a page when looking at its layout. 
</p>
<button onclick="document.getElementById('para').style.color='red'">
	click me
</button>
</body>
</html>

3. We can also Hide & Show HTML elements

By using getElementById method, we can hide and show HTML elements.

Example: In this example, I will change the display property value to none. Then, whenever I click on the button the paragraph text will hide.

<!DOCTYPE html>
<html lang="en-US">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title> JavaScript Tutorials </title>
	<link rel="stylesheet" href="style.css" type=text/css>
</head>
<body>
	
<p id="para">
	It is a long established fact that a reader
	will be distracted by the readable content 
	of a page when looking at its layout. 
</p>
<button onclick="document.getElementById('para').style.display='none'">
	click me
</button>
</body>
</html>

You can hide the text by default and then by using JS you can show text.

Here is a the answer of the question which you can have in your mind.

Q. Is this language is Hard to learn?

It isn’t hard to learn. Actually, it is easier than other programming languages. If you’re a beginner, then it can take a lot of time to learn. The key to success is to try again till you succeed. And don’t learn coding without doing it.

Note: You should read our tutorials in sequence. To learn faster and gain complete knowledge do not skip any chapter.

Tip: We can use both single and double quotes in this programming language.

After learning all these three languages, you will be able to create your own website using these languages.

I hope you understood well. In the next chapter, we will discuss how to get started with it and how to add this in HTML.

If you have any questions, feel free to ask in the comment section below. We will answer any questions as soon as possible.

Frequently Asked Questions (FAQs)

Q1. What is JavaScript?

JavaScript is a text-based most popular programming language used in web development. JavaScript allows us to implement complex features on web pages. It is the most powerful language for web development. One of the three languages that web developers learn after HTML and CSS. It is best known as a scripting language for web pages.
You will see ECMAScript sometimes. It is the official name of the language.

Q2. What JavaScript can do?

JavaScript makes web pages more interactive. By using JavaScript, you can change any HTML & CSS content. For example, you can use it to change CSS style values, HTML attribute values, HTML elements content, also you can hide and show HTML elements, etc. It allows us to create highly responsive interfaces that improve the user experience. In our JavaScript Tutorials, you will learn anything about it.

Q3. Who developed JavaScript?

In September 1995, Brandan Eich developed JavaScript.

Q4. Is JavaScript Front-end or Back-end?

It uses in both front-end and back-end web development.

Q5. What are JavaScript Libraries used for?

Libraries are pre-written codes that we can use to create websites faster. jQuery and AJAX are the most popular libraries.

Q6. What are the different JavaScript frameworks?

Some Most Popular Frameworks:
1. React .js
2. Vue .js
3. Angular .js
4. Ember .js
5. Preact .js
6. Next .js
7. Gatsby .js

Q7. What can we build with JavaScript?

Using JavaScript we can:
1. Creat Websites
2. Create Web Applications and Mobile Apps
3. Build Server Applications
4. Build Web Servers
5. Build Games
6. All kinds of web-related activities.

In this course, we will learn JavaScript from beginner’s level to advanced level. We will learn JavaScript with examples and images. After all, we will make javascript projects. We’ll make interactive web pages, like landing pages, contact pages. We’ll make a full website using HTML, CSS & JavaScript.

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