A More Complex Example

The previous examples were deliberately rather simple. Now that the basics of custom Hooks are clear, it makes sense to dive into a slightly more advanced and realistic example.

Consider the HTTP request example from the beginning of this chapter:

const initialHttpState = {
  data: null,
  isLoading: false,
  error: null,
};
function httpReducer(state, action) {
  if (action.type === 'FETCH_START') {
    return {
      ...state, // copying the existing state
      isLoading: state.data ? false : true,
      error: null,
    };
  }
  if (action.type === 'FETCH_ERROR') {
    return {
      data: null,
      isLoading: false,
      error: action...