A Crash Course of The Composable Architecture
summary
Live-coding builds a working Pomodoro app using The Composable Architecture (TCA): State/Action/Reducer/Store, ViewStore bindings, and ReducerBuilder. Side effects run with async run blocks, a cancelable effect with ID stops the timer, and time is tested with a TestClock-controlled time advancement injected via the dependency system. Tests use TestStore, mockable UUID and Date generators, and assert exact state transitions for individual ticks; child screens use IdentifiedArray for child features and PresentationAction wiring.
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chapters (22)
- 0:00Introduction
- 0:48What is TCA?
- 3:34Live demo setup
- 6:25Modeling actions and state
- 8:11Connecting view to store
- 9:14Handling text input
- 11:06Disabling UI controls
- 11:27Writing tests
- 12:52Adding timer logic
- 14:58Canceling effects
- 16:01Testing async effects
- 18:15Fixing timer duration
- 19:18Testing timer completion
- 22:47Storing timer items
- 23:50Testing list updates
- 24:53Mocking dependencies
- 25:57Adding list view
- 26:59Child feature communication
- 29:50Scoping and presentation
- 31:36Sheet integration
- 32:43Handling child actions
- 33:27Summary and resources
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