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How does The Composable Architecture (TCA) work in large iOS apps?

Updated May 6, 2026

Short answer

TCA enforces a unidirectional, composable state-management architecture using reducers, state, and actions.

Deep explanation

The Composable Architecture (TCA) structures apps around a central Store that holds state and processes actions through pure reducer functions. Each feature is isolated into its own reducer, enabling composition into larger systems. Side effects are handled via effects, ensuring testability and predictable state transitions. It scales well by enforcing strict unidirectional data flow and modular feature composition.

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