如何在Javascript中获取作为列表给出的属性子集？ [复制]

【问题标题】：How to get an subset of properties given as list in Javascript? [duplicate]如何在Javascript中获取作为列表给出的属性子集？ [复制]
【发布时间】：2020-04-12 02:02:38
【问题描述】：

我需要带有数组的地图对象数据

const data = [
              {name:"John", age:"22", weight:"60", height:"180cm"},
              {name:"Emma",age:"25",weight:"55",height:"160cm"}
             ]

const key =  ["name", "weight", "height"]

我需要这样的结果

const result = [
                {name:"John", weight:"60", height:"180cm"},
                {name:"Emma", weight:"55",height:"160cm"}
               ]

感谢您的帮助

【问题讨论】：

如果我理解正确，您只想删除属性名称年龄？
你已经尝试了什么？

标签： javascript arrays object

【解决方案1】：

您可以在每个对象上只使用map，然后使用Object.fromEntries 使用给定的键创建一个新对象：

const data = [
  { name: "John", age: "22", weight: "60", height: "180cm" },
  { name: "Emma", age: "25", weight: "55", height: "160cm" }
]
const keys = ["name", "weight", "height"]

const res = data.map(o => Object.fromEntries(keys.map(k => [k, o[k]])))
console.log(res)

使用reduce而不是两个循环会更好，尽管可读性较差：

const data = [
  { name: "John", age: "22", weight: "60", height: "180cm" },
  { name: "Emma", age: "25", weight: "55", height: "160cm" }
]
const keys = ["name", "weight", "height"]

const res = data.map(o => keys.reduce((a, k) => (a[k] = o[k], a), {}))
console.log(res)

【讨论】：