将对象的值匹配到js中的另一个数组

Question

你好，我有一个数组对象，我必须从具有匹配数组键的对象中找到值，下面是数组和对象，我试过但没有得到结果

var filterkey = [a,b,c];
var palistarray = [{
{
            "Id": 199,
            "a": "Rajesh Tamore",
            "b": "23/11/2022",
            "c": "23/11/2022",
            "d": "W"
        },
        {
            "Id": 200,
            "a": "Sunil N",
            "b": "21/11/2022",
            "c": "21/11/2022",
            "d": "S"
        },
}]

i want result like below
[{
{
            "a": "Rajesh Tamore",
            "b": "23/11/2022",
            "c": "23/11/2022",
        },
        {
            "a": "Sunil N",
            "b": "21/11/2022",
            "c": "21/11/2022",
        },
}]

我试过下面的代码

 palistarray.find((item,index) => {
    console.log(item[filterkey[index]]);
  });

Answer 1

尝试像这样使用Array.prototype.map() 、 Object.keys()和Object.prototype.hasOwnProperty()函数：

const result = palistarray.map((obj) => {
    const newObj = {};
    Object.keys(obj).forEach((key) => {
        if (filterkey.includes(key) && obj.hasOwnProperty(key)) {
            newObj[key] = obj[key];
        }
    });
    return newObj;
});

Answer 2

您可以编写自己的函数，如下所示：

 const filterkey = ['a', 'b', 'c'] const palistarray = [ { 'Id': 199, 'a': 'Rajesh Tamore', 'b': '23/11/2022', 'c': '23/11/2022', 'd': 'W', }, { 'Id': 200, 'a': 'Sunil N', 'b': '21/11/2022', 'c': '21/11/2022', 'd': 'S', }, ] const filterBy = (array, predicate) => array.map(value => { const result = {} predicate.forEach(key => { if (value[key]) { result[key] = value[key] } }) return result }) const result = filterBy(palistarray, filterkey) console.log(result)

最好的祝福！

Answer 3

我必须假设你的数组应该是这样的，没有额外的花括号：

var palistarray = [{

            "Id": 199,
            "a": "Rajesh Tamore",
            "b": "23/11/2022",
            "c": "23/11/2022",
            "d": "W"
        },
        {
            "Id": 200,
            "a": "Sunil N",
            "b": "21/11/2022",
            "c": "21/11/2022",
            "d": "S"
       },
];

一个非常简单的方法是这样的：

 const filterArray = ["a", "b", "c"]; const palistarray = [{ "Id": 199, "a": "Rajesh Tamore", "b": "23/11/2022", "c": "23/11/2022", "d": "W" }, { "Id": 200, "a": "Sunil N", "b": "21/11/2022", "c": "21/11/2022", "d": "S" }, ]; const mapped = palistarray.map(item => { const data = {}; filterArray.forEach(key => { data[key] = item[key]; }) return data; }); console.log(mapped);

这只是映射并从对象返回指定键的情况