insuranceCompExample.js

/* Redux example with Insurance company setting based on Stephen Grider's Redux Explanation.
This is built using vanilla JS*/
import Redux from 'redux';
const insuranceCompany = () => {
  const {createStore, combineReducers } = Redux;

  // action creators (represents some kind of form)
  const createClaim = (name, amountOfMoneyToClaim) => {
    return {
      type: 'CREATE_CLAIM',
      payload: {
        name,
        amountOfMoneyToClaim
      }
    }
  }

  const createPolicy = (name) => {
    return {
      type: 'CREATE_POLICY',
      payload: {
        name,
        amount: 1000
      }
    };
  };

  const deletePolicy = (name) => {
    return {
      type: 'DELETE_POLICY',
      payload: {
        name
      }
    };
  };

  // reducers (represents each department)
  const claimsHistory = (oldListOfClaims = [], action) => {
    if (action.type === 'CREATE_CLAIM') {
      return [...oldListOfClaims, action.payload];
    }
    return oldListOfClaims;
  };

  const accounting = (moneyReserve = 1000000, action) => {
    if (action.type === 'CREATE_CLAIM') {
      return moneyReserve - action.payload.amountOfMoneyToClaim;
    } else if (action.type === 'CREATE_POLICY') {
      return moneyReserve + action.payload.amount
    }
    return moneyReserve;
  }

  const policies = (listOfPolicies = [], action) => {
    if (action.type === 'CREATE_POLICY') {
      return [...listOfPolicies, action.payload.name];
    } else if (action.type === 'DELETE_POLICY') {
      return listOfPolicies.filter(policy => policy !== action.payload.name);
    }
    return listOfPolicies;
  };

  // combine reducers (combine all departments portrays the setup of the company)
  const ourDepartments = combineReducers({
    accounting,
    claimsHistory,
    policies
  });

  // create store (represents company as whole)
  const store = createStore(ourDepartments);

  // dispatch (form receivers)
  const test = () => {
    store.dispatch(createPolicy('Jane Doe'));
    console.log(store.getState());
    store.dispatch(createClaim('Jane Doe', 20000))
    console.log(store.getState());
    store.dispatch(deletePolicy('Jane Doe'));
    console.log(store.getState());
  };

  return {
    test,
    store
  };
}

export default insuranceCompany;