async-action-fetch-data.js

import 'whatwg-fetch';

...

export function fetchData(id) {
  return (dispatch, getState) => {
    if(getState().id === id)) {
      return; // No need to fetch
    }
    dispatch(requestData(id));
    return fetch('/api/data/' + id)
      .then(checkResponse)
      .then(response => response.json())
      .then(json => dispatch(receiveDataSuccess(json)))
      .catch(error => dispatch(receiveDataFailure(error)))
  }
}