How do you write a generator function in Redux-Saga

Question

Can you tell me How do you write a generator function in Redux-Saga?

Answer 1

In Redux-Saga, generator functions are used to manage side effects in a declarative way. A generator function allows you to yield effects (such as call, put, take, select, etc.) that Redux-Saga will handle.

Basic Structure of a Redux-Saga Generator Function:

function*: This is the syntax for defining a generator function.

yield: This is used to yield control back to the Redux-Saga middleware to handle asynchronous actions.

Example: Basic Saga with API Call

import { call, put } from 'redux-saga/effects';

import { fetchDataApi } from './api';  

function* fetchDataSaga(action) {

  try {

    const data = yield call(fetchDataApi, action.payload);

    yield put({ type: 'FETCH_SUCCESS', payload: data });

  } catch (error) {

    // Dispatch failure action in case of an error

    yield put({ type: 'FETCH_FAILURE', error: error.message });

  }

}