Question 1

How to set up Idris with Node.js for a microservice?

Accepted Answer

Follow the project's setup instructions: install the specific Idris version from VERSIONS, use npm for dependencies like sqlite, and run commands like `make init-db` and `make start-opt`. It provides a blueprint but requires careful configuration due to Idris's niche ecosystem.

Question 2

Is Idris good for Domain-Driven Design compared to F#?

Accepted Answer

Idris offers dependent types for explicit architectural connections, pushing DDD further with compile-time guarantees, while F# from Scott Wlaschin's book is more practical for production with a mature ecosystem. This project bridges the gap but highlights Idris's experimental nature.

Question 3

Can I use the Order Taking project in production?

Accepted Answer

Not directly, as it's an educational example with incomplete parts like error handling and testing. It's best for learning DDD with dependent types, but you'd need to extend it significantly for production use, given Idris's limited tooling.

Question 4

How to implement free monads in Idris for domain modeling?

Accepted Answer

The project demonstrates this with a free monadic DSL for the order-taking workflow, showing how to separate domain logic from implementation. Study the code in the repository, which includes examples inspired by Type-Driven Development with Idris.

Question 5

What are the performance trade-offs of using Idris for backend services?

Accepted Answer

Idris prioritizes type safety over runtime optimization, so performance may lag behind languages like Go or Java. The project uses Node.js FFI, which adds overhead, making it suitable for prototypes or learning rather than high-throughput systems.

Question 6

Order Taking vs other DDD examples in Haskell or Scala?

Accepted Answer

Order Taking uniquely uses dependent types for explicit connections, offering stronger guarantees but with a steeper learning curve. Haskell and Scala have larger communities and libraries, making them better for production DDD projects without the Idris complexity.

OrderTaking

What is OrderTaking?

Overview

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Frequently Asked Questions