我如何动态地从对象中提取所有元素

Question

我如何从一个对象中提取特定的列，我有一个列数组，我想从一个对象中提取这些字段，该对象将由 map 循环函数构造，这是项目。现在在这里，如何动态检查我的字段。我不想要这样的 item[col[0]]。请告诉我一个捷径。

const person = [{
  firstName: "Nick",
  lastName: "Anderson",
  age: 35,
  sex: "M"
},
{
  firstName: "yopm",
  lastName: "Geyun",
  age: 36,
  sex: "M"
}]

const col=['firstName' , 'age']

return person.map(item=>{
     var i=0;        
     return [
         //How can i confgure here , that i show stop increment or not.
        item[col[i]],
        item[col[i+1]]
//here i want to fetch my colums['firstName' , 'age] from item {
//{firstName: "Nick",lastName: "Anderson",age: 35,sex: "M"} dynamically.
]   
})
}

console.log(func())

我如何在这里配置，是否显示停止增量。项目[col[i]], 项目[col[i+1]] 我想要动态的

Answer 1

只需遍历 col 属性和 .map 到一个新数组。您还可以考虑将 person 变量名称更改为 people（或类似名称），因为它是一个 collection 人，而不是单个人，减少了混淆的机会：

const people = [{
    firstName: "Nick",
    lastName: "Anderson",
    age: 35,
    sex: "M"
  },
  {
    firstName: "yopm",
    lastName: "Geyun",
    age: 36,
    sex: "M"
  }
]

const col = ['firstName', 'age']

console.log(
  people.map(
    person => col.map(prop => person[prop])
  )
);

我如何动态地从对象中提取所有元素

How can i extract all the element from object dynamically

javascript

arrays

json

object

destructuring