immer-producer-3

redux.js

// Shortened, based on: https://github.com/reactjs/redux/blob/master/examples/shopping-cart/src/reducers/products.js
const byId = (state, action) => {
  switch (action.type) {
    case RECEIVE_PRODUCTS:
      return {
        ...state,
        ...action.products.reduce((obj, product) => {
          obj[product.id] = product
          return obj
        }, {})
      }
    default:      
      return state
  }
}