如何迭代对象文字数组以查找匹配的属性？

Question

这是一个购物车。

我想检索regularListings中的商品价格，并用它们来计算购物车的总数。

购物车中的第一项＆＃39; michael＆＃39;是客户的名字。

如何在JavaScript中完成？

'use strict'

const listing =
  (name, price) => ({
    name,
    price
  })

const cart =
  (customer, ...items) => ({
    customer,
    items
  })

const listedPrice =
  listing =>
    name =>
      name === listing.name
        ? listing.price
        : 0

const regularListings = [
  listing('detergent', 10),
  listing('hennessey', 100),
  listing('carlo rozzi', 20),
  listing('coffee', 5),
  listing('cookies', 6),
  listing('mountain dew', 2)
]

const carts = [
  cart(
    'michael',
    'coffee',
    'hennessey',
    'coffee',
    'hennessey',
    'coffee',
    'hennessey'
  )
]

Answer 1

您可以减少regularListings并计算总数

const regularListings = [
  listing('detergent', 10),
  listing('hennessey', 100),
  listing('carlo rozzi', 20),
  listing('coffee', 5),
  listing('cookies', 6),
  listing('mountain dew', 2)
]

const total = regularListings.reduce((state, item) => state + item, 0);