If you are interested in making web apps and data science, then you should learn JavaScript. Here's why:

1. JavaScript is the language of the web: JavaScript is the most widely used programming language for web development. It is used to create interactive web pages, web applications, and even server-side applications. Java, on the other hand, is mainly used for building desktop applications and enterprise-level software.

2. JavaScript has a large and active community: JavaScript has a massive community of developers who are constantly creating new libraries, frameworks, and tools. This means that you will have access to a wealth of resources and support as you learn and build your web apps.

3. JavaScript is essential for data visualization: If you are interested in data science, then you will likely need to create visualizations of your data. JavaScript has several powerful libraries, such as D3.js and Chart.js, that make it easy to create beautiful and interactive data visualizations.

4. JavaScript is easy to learn: Compared to Java, JavaScript is relatively easy to learn. It has a simple syntax and can be used to create simple web apps with just a few lines of code. This makes it an excellent choice for beginners who are just starting with web development.

In conclusion, if you want to make web apps and are interested in data science, then JavaScript is the way to go. It is the language of the web, has a large and active community, is essential for data visualization, and is easy to learn.
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