No upsides compared to what? Faster development time compared to Java, C-family languages is an upside. Faster VM (V8) than Ruby MRI, and just about every other dynamic scripting language, is also an upside. It&#x27;s also an incredibly easy language to learn and write. Many of the weird inherent flaws went away with strict mode and ES5, ES2015 has helped make it much more elegant to read. Of course, you can always switch to a superior language like Elm that benefits from the same VM.