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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Functors can help remove a lot of code duplication. For example, the language I am working on has a big equational unification framework for its type system, and I can compose unifiers easily by making them meet some common specification and tying things together. Without functors, I would need to have callback arguments and extra constants in a bunch of the functions, and each function relevant to each unifier would have to be tied together individually, which would be a terrible mess.
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