What does it mean for a language to be scalable? Scalability is the property of a language to grow with an increase in demand.

While there are many reasons for Scala’s scalability, the most prominent is its combination of being both object-oriented and functional. There are other languages that provide both functional and object-oriented programming, but none are able to fuse them together into one uniform language the way Scala does.

Functional + OOPS Scala