JavaScript Wikipedia

Companies across industries are actively seeking professionals proficient in JavaScript to drive their tech initiatives and stay competitive in the digital landscape. In fact, in our 2023 Developer Skills Report, we found JavaScript to be the fifth-most in-demand programming language, based on volume of monthly active tests. The rise of serverless computing has brought new opportunities for JavaScript developers. Platforms like AWS Lambda and Google Cloud Functions allow developers to write serverless functions using JavaScript. This approach enables developers to focus on writing the application logic without worrying about server management or scalability. JavaScript’s compatibility with serverless architectures has made it a preferred language for building scalable and cost-effective cloud applications.

All major web browsers have a dedicated JavaScript engine to execute the code on users’ devices. It is the third layer of the layer cake of standard web technologies, two of which (HTML and CSS) we have covered in much more detail in other parts of the Learning Area. There are many reasons why Java is one of the most widely used programming languages.

What is JavaScript doing on your page?

JavaScript is a high-level language, meaning it’s abstracted from the low-level workings of the computer it is running on. Reducing high-level programming calculations to low-level execution takes time. It’s not much time by human standards, but it will start to be noticeable over a few thousand functions and calculations. JavaScript is a lightweight, cross-platform, single-threaded, and interpreted compiled programming language. It is well-known for the development of web pages, and many non-browser environments also use it.

  • HTML, CSS and JavaScript are the three core languages of the web.
  • Here’s a breakdown of some of the main ones you’ll encounter and what they do.
  • JavaScript engines are now embedded in a variety of other software systems, both for server-side website deployments and non-browser applications.
  • Here we’ll actually start looking at some code, and while doing so, explore what actually happens when you run some JavaScript in your page.
  • Microsoft used the name JScript to avoid potential licensing conflicts with Netscape.
  • Instead, web browsers interpret JavaScript code directly, executing it on the fly as it is encountered.
  • Having variables with no values will result in an undefined error.

That’s why JavaScript frameworks and libraries (tools that make JS a whooole lot easier to use) are your new best friends. Here’s a breakdown of some of the main ones you’ll encounter and what python for javascript developers they do. JavaScript code can also be added to a page as a separate header file with the extension .js (generally done if it’s code that you want to include across a number of pages at once).

JavaScript Can Show HTML Elements

The tutorial comes with examples and a further explanation about JavaScript’s implementation. The JavaScript official website also provides tons of demo tutorials for beginners and enthusiasts alike. On the other hand, external JavaScript involves storing the code in a separate .js file and then recalling it within the HTML page. Developers often use this method when working on large projects, as doing so keeps the script organized. Primitive data types, consisting of all data types except object, can only store a single data. Meanwhile, the object data type can contain a collection of values.

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