mounted is false
The state object can never remount, and an error is thrown is setState() is called.
Q28: List some approaches for State management in Flutter
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Answer
The state of an app is everything that exists in memory when the app is running. This includes the app’s assets,
all the variables that the Flutter framework keeps about the UI, animation state, textures, fonts, and so on.
There are some states ,e.g textures, that the flutter framework handles by itself.
The states that we manage can be separated into two conceptual types: - Ephemeral
state - App state
Some approaches to state management in Flutter are:
setState
InheritedWidget & InheritedModel
Provider & Scoped Model
Redux
BLoC / Rx
MobX
Q29: What is the difference between debug mode and profile mode?
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Answer
Debug Mode:
It is used during development stage and when you want to use hot reload.
By default, flutter run compiles to debug mode.
Debug mode for mobile apps mean that: - Assertions are enabled. - Service extensio
ns are enabled. - Compilation is optimized for fast development and run cycles (bu
t not for execution speed, binary size, or deployment). - Debugging is enabled, and
tools supporting source level debugging (such as DevTools) can connect to the proce
ss.
Debug mode for a web app means that: - The build is not minified and tree shaking h
as not been performed. - The app is compiled with the dartdevc compiler for easier
debugging.
Profile Mode:
Profile mode is used when you want to analyze performance.
The command flutter run --profile compiles to profile mode.
Profile mode is disabled on the emulator and simulator, because their behavior is n
ot representative of real performance.
On mobile, profile mode is similar to release mode, with the following differences:
- Some service extensions, such as the one that enables the performance overlay, ar
e enabled. - Tracing is enabled, and tools supporting source-level debugging (such
as DevTools) can connect to the process.
Profile mode for a web app means that: - The build is not minified but tree shaking
has been performed. - The app is compiled with the dart2js compiler.
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