The concepts of Semantic Functions and Pragmatic Functions seem to be analogous to a Functional Core and Imperative shell (FCIS): https://testing.googleblog.co

The concepts of Semantic Functions and Pragmatic Functions seem to be analogous to a Functional Core and Imperative shell (FCIS): https://testing.googleblog.com/2025/10/simplify-your-code-functional-core.html https://testing.googleblog.com/2025/10/simplify-your-code-fu... The key insight of FCIS is that complicated logic with large dependencies leads to a large test suite that runs slowly. The solution is to isolate the complicated logic in the functional core. Test that separately from the simpler, more sequential tests of the imperative shell.