The computer language JavaScript gives your website liveliness. This occurs in video games, in the way that buttons react or how data is entered on forms, in dynamic style, in animation, etc. You may learn more about JavaScript in this post and expand your knowledge of what is possible.

JavaScript: What is it?

JavaScript is a potent programming language that may increase a website’s interactivity. Brendan Eich is the one who created it.

JavaScript is adaptable and user-friendly for newcomers. You’ll be able to develop games, animated 2D and 3D visuals, thorough database-driven programmes, and much more as you gain expertise.

Although very small in size, JavaScript is quite versatile. On top of the fundamental JavaScript language, programmers have created a range of tools, enabling a large amount of capability with little effort. These consist of:

Web browsers provide built-in Application Programming Interfaces (APIs) for a variety of tasks, including dynamically generating HTML and CSS styles, gathering and modifying camera video streams, and producing 3D images and audio samples.
APIs from third parties that enable developers to include features in websites from other content providers, like Twitter or Facebook.
Frameworks and libraries from outside sources that you may use with HTML to speed up the process of creating websites and applications.

The specifics of how the basic JavaScript language differs from the tools mentioned above are outside the scope of this article’s brief introduction to JavaScript. You may learn more in other MDN sections as well as the JavaScript study area.

In addition to providing an opportunity to experiment with a few browser API functions, the section below presents certain characteristics of the core language. A wonderful time!

A “Hello world!” illustration

One of the most widely used web technologies nowadays is JavaScript! Your websites will enter a new realm of strength and originality as your JavaScript abilities advance.

Contrary to popular belief, learning JavaScript is more difficult than learning HTML and CSS. You might need to make slow, incremental progress. Let’s look at adding JavaScript to your page to create a Hello world! sample first. (Good day, world!),_World!%22_program

Navigate to your test site and make a new scripts folder. Create a new text file called main.js in the scripts folder and save it.
Put this code on a new line in your index.html file, immediately before the closing The following script is in the body tag: src=”scripts/main.js”>

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This serves the same purpose as the CSS link> element. It adds JavaScript to the page so that it can impact the HTML (along with the CSS, and anything else on the page).
the main.js file with the following code:
if myHeading.textContent = “Hello world!” and myHeading.querySelector(“h1”), respectively,
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Ensure sure the JavaScript and HTML files are saved. On your browser, open index.html after that. You ought to see something similar to this:

Because the browser interprets code in the order it occurs in the file, the script> element is placed at the bottom of the HTML file according to the instructions (above).

Problems may arise if JavaScript loads first and is intended to influence HTML that hasn’t yet loaded. One method to address this need is to put JavaScript at the bottom of an HTML page. See for further information on other methods.

What took place?

JavaScript was used to modify the header text to Hello world. You achieved this by grabbing a reference to your heading using the querySelector() function and storing it in the myHeading variable. This is comparable to what we accomplished with CSS selectors. You must first choose an element before making any changes to it.

The textContent property of the myHeading variable, which denotes the heading’s content, was then set to the value Hello world! by the code.

A crash lesson in language basics

Let’s go through some of the key components of JavaScript to help you better grasp how it functions. It’s important to note that all programming languages have these characteristics. If you are able to understand these foundations, you will be more prepared to code in other languages as well.


Values are kept in containers called variables. You declare a variable by first using the let keyword, then following it with the variable name:

copy to clipboard; let myVariable

A semicolon at the end of a line denotes the conclusion of a statement. Only when you need to divide up assertions on a single line is it necessary. Nonetheless, some individuals consider using semicolons to separate each sentence to be best practise. Other guidelines govern when and when not to utilise semicolons. Your Guide to Semicolons in JavaScript has further information.

There are certain limitations, but almost anything may be used as a variable name. Regarding name conventions, see this section. If you are doubtful, you can verify the validity of your variable name.

JavaScript takes case into account. As a result, myVariable and myvariable are not the same thing. Check the case if your code is having issues!

You can assign a value to a variable after it has been declared:

Bob is my variable; copy to clipboard
You may do both of these procedures on the same line, as well:

Let Bob be my variable;
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Calling the variable name returns the value.

Copy to Clipboard; myVariable
You can alter a variable’s value after you’ve assigned it one in the code:

Let myVariable = “Bob” and myVariable = “Steve,” then copy the values to the clipboard.

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