Scala is a pure-bred object-oriented language. Conceptually, every value is an object and every operation is a method-call. The language supports advanced component architectures through classes and traits. Even though its syntax is fairly conventional, Scala is also a full-blown functional language. It has everything you would expect, including first-class functions, a library with efficient immutable data structures, and a general preference of immutability over mutation.

Scala Language - Object-Oriented Meets Functional

Groovy is a powerful, optionally typed and dynamic language, with static-typing and static compilation capabilities, for the Java platform aimed at multiplying developers’ productivity thanks to a concise, familiar and easy to learn syntax.  It integrates smoothly with any Java program, and immediately delivers to your application powerful features, including scripting capabilities, Domain-Specific Language authoring, runtime and compile-time meta-programming and functional programming.

Groovy - A dynamic language for the Java platform

Eta is a pure, lazy, strongly typed functional programming language on the JVM. It is a dialect of Haskell on the JVM. It is pure by default which means that calling a function with the same arguments will yield the same results every time. It is lazy by default which means that data stays in unevaluated state until a function needs to peek inside.
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A strong type system gives you the power to tell the compiler more information about your code. Eta uses type inference so that it can understand your intent even if you don't explicity specify the types of your expressions
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Eta runs on the JVM and it is designed to be compatable with Java. This means that you can reuse Java libraries in Eta projects and use Eta modules in Java. Eta's immutability makes concurrency a pleasure to work with. Eta offers a wide range of strategies for handling concurrency including the Par monad for fine-grained parallelism and Software Transactional Memory for reusable concurrent programming without locks.

Eta is a pure, lazy, strongly typed functional programming language on the JVM. It is a dialect of Haskell on the JVM. It is pure by default which means that calling a function with the same arguments will yield the same results every time. It is lazy by default which means that data stays in unevaluated state until a function needs to peek inside.

Eta - A powerful language for building scalable systems on the JVM

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Scala Language - Object-Oriented Meets Functional

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