javascript - 我如何在 JavaScript 中准备嵌套键值对列表

Question

我的数据行如

1. {type:"pant", service:"normal", price:"30"}
2. {type:"pant", service:"premium 1", price:"50"}
3. {type:"pant", service:"premium 2", price:"70"}
4. {type:"pant", service:"premium 3", price:"100"}

寻找类似的东西

var x = {"pant", [{service:"normal", price:"30"},{service:"premium 1", price:"50"} ,{service:"premium 2", price:"70"}, {service:"premium 3", price:"100"}]}

这样我就可以通过执行x['pant']

来获得所有类型的服务及其价格

Answer 1

使用数组reduce函数并按名称pant创建一个键。检查 key 是否存在，然后推送 service 和 price

的值

预期的对象也是无效的。对象键由冒号分隔 (:)按照这种格式

obj = {
  key:value
}

var data = [{
  type: "pant",
  service: "normal",
  price: "30"
}, {
  type: "pant",
  service: "premium 1",
  price: "50"
}, {
  type: "pant",
  service: "premium 2",
  price: "70"
}, {
  type: "pant",
  service: "premium 3",
  price: "100"
}]

var x = data.reduce(function(acc, curr, currIndex) {
  if (!acc[curr.type]) {
    acc[curr.type] = []
  }

  acc[curr.type].push({
    service: curr.service,
    price: curr.price
  })

  return acc;


}, {});

console.log(x)