Function addToCart

examples/shopping-cart/src/actions/index.js:20–24

})

export const addToCart = productId => (dispatch, getState) => {
  if (getState().products.byId[productId].inventory > 0) {
    dispatch(addToCartUnsafe(productId))
  }
}

export const checkout = products => (dispatch, getState) => {
  const { cart } = getState()