Data Persistence
AsyncStorage, MMKV, SQLite, Realm, secure storage, caching strategies
1What is the main characteristic of AsyncStorage in React Native?
What is the main characteristic of AsyncStorage in React Native?
답변
AsyncStorage is an asynchronous, unencrypted, persistent key-value storage system. It works globally across the app and stores data as strings. It's the simplest storage solution built into React Native, ideal for simple user preferences or non-sensitive data.
2How to store a JavaScript object in AsyncStorage?
How to store a JavaScript object in AsyncStorage?
답변
AsyncStorage can only store strings. To store a JavaScript object, it must be serialized with JSON.stringify() before storing, then deserialized with JSON.parse() when reading. This step is mandatory because AsyncStorage does not accept objects directly.
3What is the main advantage of MMKV compared to AsyncStorage?
What is the main advantage of MMKV compared to AsyncStorage?
답변
MMKV (Memory-Mapped Key-Value) offers performance up to 30 times faster than AsyncStorage thanks to memory-mapping and synchronous data access. Developed by WeChat to handle billions of users, it's particularly suited for applications requiring frequent reads/writes or large data sizes.
When should SQLite be used instead of AsyncStorage or MMKV?
What is the main characteristic of Realm compared to SQLite?
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