What is JavaScript? Complete Introduction with Hello World! Example

Here we are reading about “What is JavaScript? Complete Introduction with Hello World! Example”.

What is JavaScript?

JavaScript is a very powerful client-side scripting language. JavaScript is used mainly for enhancing the interaction of a user with the webpage. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. JavaScript is also being used widely in game development and Mobile application development.

What makes JavaScript unique?

There are at least three great things about JavaScript:
  • Full integration with HTML/CSS.
  • Simple things done simply.
  • Supported by all major browsers and enabled by default.
Combined, these three things exist only in JavaScript and no other browser technology.
That’s what makes JavaScript unique. That’s why it’s the most widespread tool to create browser interfaces.
While planning to learn a new technology, it’s beneficial to check its perspectives. So let’s move on to the modern trends that include new languages and browser abilities.

Code editors

A code editor is the place where programmers spend most of their time.
There are two archetypes: IDE and lightweight editors. Many people feel comfortable choosing one tool of each type.

IDE

The term IDE (Integrated Development Environment) means a powerful editor with many features that usually operates on a “whole project”. As the name suggests, that’s not just an editor, but a full-scale “development environment”.
An IDE loads the project (can be many files), allows navigation between files, provides autocompletion based on the whole project (not just the open file), integrates with a version management system (like git), a testing environment and other “project-level” stuff.
If you haven’t considered selecting an IDE yet, look at the following variants:
  • WebStorm for frontend development and other editors of the same company if you need additional languages.
  • Visual Studio is fine if you’re a .NET developer, and a free version is available (Visual Studio Community)
  • Netbeans.
All of the IDEs except Visual Studio are available on Windows, MacOs and Linux. Visual Studio doesn’t work on Linux.

Lightweight editors

“Lightweight editors” are not as powerful as IDEs, but they’re fast, elegant and simple.
They are mainly used to instantly open and edit a file.
The main difference between a “lightweight editor” and an “IDE” is that an IDE works on a project-level, so it loads much more data on start, analyzes the project structure if needed and so on. A lightweight editor is much faster if we need only one file.
In practice, lightweight editors may have a lot of plugins including directory-level syntax analyzers and autocompleters, so there’s no strict border between a lightweight editor and an IDE.
The following options deserve your attention:

Javascript History

Brendan Eich is an American technologist and creator of the JavaScript programming language. He co-founded the Mozilla project, the Mozilla Foundation and the Mozilla Corporation, and served as the Mozilla Corporation’s chief technical officer and briefly its chief executive officer. He is the CEO of Brave Software.
What is JavaScript? Complete Introduction with Hello World! Example
Brendan Eich – Creator of JavaScript
The language was initially called LiveScript and was later renamed JavaScript. There are many programmers who think that JavaScript and Java are the same. In fact, JavaScript and Java are very much unrelated. Java is a very complex programming language whereas JavaScript is only a scripting language. The syntax of JavaScript is mostly influenced by the programming language C.

A Simple JavaScript Program

You should place all your JavaScript code within <script> tags (<script> and </script>) if you are keeping your JavaScript code within the HTML document itself. This helps your browser distinguish your JavaScript code from the rest of the code. As there are other client-side scripting languages (Example: VBScript), it is highly recommended that you specify the scripting language you use.  You have to use the type attribute within the <script> tag and set its value to text/javascript like this:
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<script type="text/javascript">

Hello World Example:

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<html>
<head>
<title>My First JavaScript code!!!</title>
<script type=”text/javascript”>
alert(“Hello World!”);
</script>
Note: type=”text/javascript” is not necessary in HTML5. Following code will work.
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<script>
alert(“Hello World!”);
</script>
So here we read about “What is JavaScript? Complete Introduction with Hello World! Example”.

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