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At Zalando, they use a "modules-as-records-of-functions" to structure their services and share code. They need the ability to create components which can easily be wired together but also changed at will for unit or integration testing even if they are very far down in the dependency tree.

This talk will show how Eric approached this problem, started solving it with 2 simple type classes and a bit of Template Haskell but then came up with a much more simple way, relying on just one data structure!

Not only this makes reconfiguring applications a breeze but the same technique can be applied to Hedgehog generators where you can define a "compositional language" to modify existing generators for nested data structures. You can now express things like "generate a model of shoe with only the colour blue and 2 sizes

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