Summary - Async Storage

Combine setItem, getItem and JSON to write a settings system.

Summary - Async Storage

In this group you learned persistent data storage. You write values with AsyncStorage.setItem, read with getItem and delete with removeItem. All operations are asynchronous; you wait with await.

To store objects you convert them to strings with JSON.stringify and convert back with JSON.parse when reading. Now let us combine these concepts in exercises.

Exercise Your turn: save a value with setItem

Save a language value by calling AsyncStorage.setItem('lang', 'tr'). Use await. The function should be async.

Show example solution

import AsyncStorage from '@react-native-async-storage/async-storage';

async function saveLang() {
  await AsyncStorage.setItem('lang', 'tr');
}

Exercise Your turn: read and parse JSON

Read the string with AsyncStorage.getItem('user') and convert it to an object with JSON.parse. Return the result.

Show example solution

import AsyncStorage from '@react-native-async-storage/async-storage';

async function loadUser() {
  const raw = await AsyncStorage.getItem('user');
  return JSON.parse(raw);
}

Test yourself

What does getItem return?
```
await AsyncStorage.getItem('k')
```
- An array
- A component
- Always a number
- A Promise (value or null)
Show answer

A Promise (value or null) — getItem returns a Promise; it resolves to a value or null.
Match: method and role

setItem

write value
getItem

read value
removeItem

delete value

Next lesson: Project design

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