Cart Reducer

cart-reducer.js

const actionTypes {
  SHOW_ALL: 'CART/SHOW_ALL',
  ADD_PRODUCT: 'CART/ADD_PRODUCT',
  REMOVE_PRODUCT: 'CART/REMOVE_PRODUCT',
}

const cart = (state, action) => {
  switch (action) {
    case actionTypes.SHOW_ALL:
      return state
    case actionTypes.ADD_PRODUCT:
      return {
        ...state,
        ...action.product
      }
    case actionTypes.REMOVE_PRODUCT:
      return state.filter(t.id => !action.product.id)
    default:
      return state
  }
}