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Is there an equivalent of DDD in FP? It seems to me that DDD is only valid in OOP paradigm.
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Domain-driven design (DDD) is a software development philosophy centered around the domain, or sphere of knowledge, of those that use it. The approach enables the development of software that is focused on the complex requirements of those that need it and doesn't waste effort on anything unneeded.
Domain-driven design is perfect for applications that have complex business logic. However, it might not be the best solution for applications with minor domain complexity but high technical complexity. Applications with great technical complexity can be very challenging for business-oriented domain experts.
Advantages of domain-driven design The most obvious advantage of DDD is that it gets everybody using the same language. When development teams use the same language as domain experts, it leads to software design that makes sense to the end user.
Initially coined by Eric Evans, Domain-Driven Design (DDD) is defined as designing software systems based on the underlying model of the business domain. Domain-Driven Design has an organizational relationship to microservices and categorizes them so their usage is easily understood.
It depends how seriously you preach the DDD gospel:
If you buy into all the details of Erik Evans's book, especially the stuff in Part II that is heavily object-oriented, than no sane person would try to duplicate that in a functional language.
If your interest is primarily in Part I of the book, that everyone on the project should have in common a language in the domain, then the leaders in the functional-programming movement have been in the area of embedded domain-specific languages. These are common currency now, but a paper by Erik Meijer and Daan Leijen at DSL'99 did a great deal to make these techniques popular. Constructing an embedded DSL is now a very popular technique in functional programming, and if you search for embedded domain specific Haskell you will find many examples.
So my answer is: the important, foundational ideas of Domain-Driven Design can be applied in a functional setting, but many of the object-oriented details are irrelevant.
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