A repository with sample projects

Current there are four sample projects:

1. Writing Async Code Inline
2. Extracting Async Action Creator
3. Use Redux Thunk
4. Use Redux Saga

The accepted answer is awesome.

But there is something missing:

1. No runnable sample projects, just some code snippets.
2. No sample code for other alternatives, such as:
   1. Redux Saga

So I created the Hello Async repository to add the missing things:

1. Runnable projects. You can download and run them without modification.
2. Provide sample code for more alternatives:
   • Redux Saga
   • Redux Loop
   • ...

Redux Saga

The accepted answer already provides sample code snippets for Async Code Inline, Async Action Generator and Redux Thunk. For the sake of completeness, I provide code snippets for Redux Saga:

// actions.js

export const showNotification = (id, text) => {
  return { type: 'SHOW_NOTIFICATION', id, text }
}

export const hideNotification = (id) => {
  return { type: 'HIDE_NOTIFICATION', id }
}

export const showNotificationWithTimeout = (text) => {
  return { type: 'SHOW_NOTIFICATION_WITH_TIMEOUT', text }
}

Actions are simple and pure.

// component.js

import { connect } from 'react-redux'

// ...

this.props.showNotificationWithTimeout('You just logged in.')

// ...

export default connect(
  mapStateToProps,
  { showNotificationWithTimeout }
)(MyComponent)

Nothing is special with component.

// sagas.js

import { takeEvery, delay } from 'redux-saga'
import { put } from 'redux-saga/effects'
import { showNotification, hideNotification } from './actions'

// Worker saga
let nextNotificationId = 0
function* showNotificationWithTimeout (action) {
  const id = nextNotificationId++
  yield put(showNotification(id, action.text))
  yield delay(5000)
  yield put(hideNotification(id))
}

// Watcher saga, will invoke worker saga above upon action 'SHOW_NOTIFICATION_WITH_TIMEOUT'
function* notificationSaga () {
  yield takeEvery('SHOW_NOTIFICATION_WITH_TIMEOUT', showNotificationWithTimeout)
}

export default notificationSaga

Sagas are based on ES6 Generators

// index.js

import createSagaMiddleware from 'redux-saga'
import saga from './sagas'

const sagaMiddleware = createSagaMiddleware()

const store = createStore(
  reducer,
  applyMiddleware(sagaMiddleware)
)

sagaMiddleware.run(saga)

Compared to Redux Thunk

Pros

• You don't end up in callback hell.
• You can test your asynchronous flows easily.
• Your actions stay pure.

Cons

• It depends on ES6 Generators which is relatively new.

Please refer to the runnable project if the code snippets above don't answer all of your questions.