Pure redux, just for understanding purpose

Redux.js

console.clear()
//action creators

const newPolicy = (name, amount) => {
  return {
    type: "NEW_POLICY",
    payload: {name: name, amount: amount}
  }
}

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

const submitClaim = (name, amount) => {
  return {
    type: "SUBMIT_CLAIM",
    payload: {name: name, amount: amount}
  }
}

//reducers

const claimHistory = (history = [], action) => {
  if (action.type == "SUBMIT_CLAIM") {
    return [...history, action.payload]
  }
  
  return [...history]
} 

const accounting = (cash = 100, action) => {
  if (action.type == "SUBMIT_CLAIM") {
    return cash - action.payload.amount
  }
  if (action.type == "NEW_POLICY") {
    return cash + action.payload.amount
  }
  
  return cash
}

const policies = (policy = [], action) => {
  if (action.type == "NEW_POLICY") {
    return [...policy, action.payload.name]
  }
  if (action.type == "DELETE_POLICY") {
    return policy.filter(name => name !== action.payload.name)
  }
  
  return policy
}

const combineReducers = Redux.combineReducers
const createStore = Redux.createStore

const departments = combineReducers({
  claimHistory: claimHistory,
  accounting: accounting,
  policies: policies,
})

const store = createStore(departments)

//sending action
const action = newPolicy('Alex', 100)
store.dispatch(action)
console.log(store.getState())