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JavaScript is a popular programming language in web development for adding interactivity and dynamic features to websites. It is a high-level, object-oriented language that can be used on both client (in web browsers) and server sides (with technologies like Node.js).

Developers use JavaScript to make interactive elements (e.g. animations), user interface components (e.g. progress bar), form validation (e.g. checking whether the required data has been filled in), and more. JavaScipt is powerful, flexible, and widely used on the web, making it a must-have skill for front-end developers.

There's a reason for JavaScript's popularity. The first one is the possibility of creating interactive elements that improve user engagement and make for a more dynamic user experience. Another is JavaScript's versatility which allows it to be used on the client and server sides. What's more, as its popularity grew, so did JavaScript's compatibility. Nowadays, it's supported by all major web browsers and can be used on any device. It also offers a wide choice of frameworks and libraries, like React, Angular, or Vue, that developers use to make websites and web apps more efficient.

To use JavaScript effectively, you need to make your code easy to read and simple to maintain. That means using proper syntax and indentation. You should also comment with explanations of what your code is doing and why, especially if the code is complex or long. And never forget to test your code so you can guarantee that it works as it's supposed to, without any bugs or errors.

There are also several things to avoid. For instance, you shouldn't use global variables unnecessarily, as it may lead to conflicts and make your code hard to debug and maintain. You should also steer clear from blocking code or long-running scripts. They decrease the web app's performance, which can cause a poor user experience. The final piece of advice? The libraries and plugins from third parties are great, but don't rely on them too much. Some of them may lead to security vulnerabilities, and others simply have compatibility issues with other parts of your code, so tread lightly.

When it comes to programming languages in web development, JavaScript is second to none – highly-compatible, versatile, and used for making websites and web apps more compelling with interactive components.

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