State represents the information a screen or application needs at a point in time. Decide who owns a value and how updates reach the interface.
Before you begin
Use a supported development setup and a small sample app. Record the toolchain, target and test device or simulator.
Work through the idea
Define a user task and the states the interface must represent. Test normal, empty and failed states as applicable, and consider larger text, narrow layouts and interrupted operations. Keep sample data fictional. Distinguish simulator checks from features that require validation on the intended physical device.
- Separate transient and persistent state
- Choose a source of truth
- Handle loading and failure explicitly
Practice task
Model a fictional task list with loading, ready, empty and failed states.
Check your result
Explain which actions are valid in each state and what survives app relaunch.
A mistake to avoid
Do not store the same mutable value in several places without a synchronization rule.
Keep a review note
Save the inputs or scenario, your reasoning and the result you checked. Explain one assumption and one case that needs more work. Revise the exercise after feedback and distinguish what you demonstrated from what remains untested.
Official reference for further study
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