Alex - reducer.js

createReducer.js

export default function createReducer(initialState, actions) {
  return function reducer(state = initialState, action) {
    const actionReducer = actions[action.type];
    if (!actionReducer) {
      return state;
    }
    
    return actionReducer(state, action);
  };
}

reducer.js

import { ACTION_TYPES } from '../actions/branchActions';
const {
  NEAREST_BRANCH_SUCCESS,
  NEAREST_BRANCH_REQUEST,
  NEAREST_BRANCH_FAILURE
} = ACTION_TYPES;

export const INITIAL_STATE = { searching: false, nearestBranch: null };

export default createReducer(INITIAL_STATE, {
  NEAREST_BRANCH_REQUEST: nearestBranchRequest,
  NEAREST_BRANCH_SUCCESS: nearestBranchSuccess,
  NEAREST_BRANCH_FAILURE: nearestBranchFailure
});

export const nearestBranchRequest = (
  state,
  { payload: { latitude, longitude } }
) => {
  return {
    ...state,
    latitude,
    longitude,
    searching: true
  };
};

export const nearestBranchSuccess = (state, { payload: { nearestBranch } }) => {
  return {
    ...state,
    nearestBranch: nearestBranch,
    searching: false
  };
};

export const nearestBranchFailure = (state, action) => {
  return {
    ...state,
    searching: false
  };
};