What is an example of using takeLatest in Redux Saga?

Can you explain how to use takeLatest in Redux Saga?

Sure! takeLatest is a Redux Saga effect that allows you to run the latest instance of a saga while canceling any previous instances. This is useful for handling actions like form submissions where you only want the latest result.

Can you provide a code example?

Absolutely! Here's a simple example:

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

function* fetchData(action) {
    const data = yield call(api.fetchData, action.payload);
    yield put({ type: 'FETCH_SUCCESS', data });
}

function* watchFetchData() {
    yield takeLatest('FETCH_REQUEST', fetchData);
}

In this example, if multiple FETCH_REQUEST actions are dispatched, only the latest one will be processed.

What happens to the previous requests?

The previous requests are canceled, meaning that if a new FETCH_REQUEST action is dispatched, any ongoing fetchData saga will be stopped, and only the latest one will continue.