The article revisits Gary Bernhardt's Functional Core, Imperative Shell architectural pattern and extends it with the concept of determinism in software design. It argues that pure functions are not the only path to deterministic code — state machines and value streams can also achieve repeatable, testable behavior.
Background
Gary Bernhardt's Functional Core, Imperative Shell pattern, introduced in his 2012 talk 'Boundary Anarchy', is a widely adopted software architecture principle for improving testability. This article builds on that foundation by exploring determinism beyond pure functional programming.
- Source
- Lobsters
- Published
- Sep 21, 2026 at 05:13 AM
- Score
- 6.0 / 10