Scala vs Scala.js: What are the differences?
What is Scala? A pure-bred object-oriented language that runs on the JVM. Scala is an acronym for “Scalable Language”. This means that Scala grows with you. You can play with it by typing one-line expressions and observing the results. But you can also rely on it for large mission critical systems, as many companies, including Twitter, LinkedIn, or Intel do. To some, Scala feels like a scripting language. Its syntax is concise and low ceremony; its types get out of the way because the compiler can infer them.
What is Scala.js? *The Scala to JavaScript compiler *. It is a safer way to build robust front-end web applications. With it, typos and type-errors are immediately caught and shown to you in your editor, without even needing to compile your code. Refactor any field or method with ease, with the confidence that if you mess it up the editor will tell you immediately.
Scala and Scala.js are primarily classified as "Languages" and "JavaScript Compilers" tools respectively.
Scala and Scala.js are both open source tools. It seems that Scala with 11.9K GitHub stars and 2.76K forks on GitHub has more adoption than Scala.js with 3.71K GitHub stars and 325 GitHub forks.
According to the StackShare community, Scala has a broader approval, being mentioned in 557 company stacks & 1895 developers stacks; compared to Scala.js, which is listed in 6 company stacks and 4 developer stacks.