Question 1

How does Eta compare to Scala for functional programming on the JVM?

Accepted Answer

Eta is closer to pure Haskell with strict functional semantics, while Scala blends object-oriented and functional styles. Eta is better for Haskell purists, but Scala has a larger ecosystem and more mature tooling for enterprise use.

Question 2

Can I use Eta with Java frameworks like Spring Boot?

Accepted Answer

Yes, Eta can interoperate with Java code via its FFI, allowing integration with Spring and other frameworks. However, setup may require additional configuration and understanding of JVM interop nuances.

Question 3

What's the performance of Eta compared to Java?

Accepted Answer

Eta runs on the JVM, so performance is generally comparable, but functional abstractions might add overhead. For most applications, it's acceptable, but benchmark testing is advised for performance-critical sections.

Question 4

Is Eta good for web development?

Accepted Answer

Eta can be used for web development by leveraging JVM web frameworks, but there are fewer Eta-specific web libraries. It's feasible but may require more integration work compared to languages with richer web ecosystems.

Question 5

How to call Java methods from Eta code?

Accepted Answer

Eta provides a Foreign Function Interface (FFI) to call Java code. You use specific syntax to import Java classes and methods, similar to Haskell's foreign import mechanism, as documented in the Eta user guide.

Question 6

Eta or Frege: which is better for Haskell on JVM?

Accepted Answer

Both bring Haskell to the JVM, but Eta focuses on GHC 7.10.3 compatibility and accessibility, while Frege has its own syntax and community. Eta might be more active, but the choice depends on your need for specific Haskell features or library support.

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