Redux-Saga manages async operations using generator functions and effects like call, put, take, and all, making the control flow of async logic more declarative and testable.
Key Differences:
Uses generator functions:
Unlike thunks, sagas yield effects that Redux-Saga interprets and executes.
Declarative side effects:
You describe what to do (call(api), put(action)), not how to do it.
Non-blocking control flow:
Effects like fork, takeEvery, and all allow concurrency and background tasks.
Centralized side effect handling:
All async logic is separated from components and action creators, making code cleaner and easier to test.
Example:
function* fetchDataSaga() {
try {
const data = yield call(api.fetchData);
yield put({ type: 'FETCH_SUCCESS', payload: data });
} catch (error) {
yield put({ type: 'FETCH_FAILURE', error });
}
}