asyncReducer.2.js

export default function asyncReducer(state = isLoading, { type, payload }) {
  switch (type) {
    case AJAX_CALL_BEGIN:
      return { ...state, [payload]: 1};

    case AJAX_CALL_SUCCESS:
      return { ...state, [payload]: 0};
    
    case AJAX_CALL_ERROR:
      return { ...state, [payload.target]: 0, error: payload.error };

    default:
      return state;
  }
}