A Redux action that returns a function, which is made possible by Redux Thunk middleware

actions.js

import axios from 'axios';

export const createCourse = (item) => {
  return function (dispatch) {
    return axios.post('create', item).then(
      res => dispatch({ type: 'CREATE_ITEM', payload: res.data }),
      error => console.log(error)
    );
  };
};