javascript - 使用 Typescript 从数组 json 中删除未在另一个数组中列出的对象(项目)

Question

我想从 JSON 数组中删除那些未在另一个数组中列出的对象。

let originalArray = [{
  id: 1,
  NoOfEmp: 12,
  Wages:1000,
  TotalSI: 21,
  Salary:3000
}, {
   id: 2,
  NoOfEmp: 13,
  Wages:2000,
  TotalSI: 22,
  Salary:4000
}]

let keepArrayObjects = ['id','NoOfEmp','Wages']


originalArray = originalArray.filter( function( el ) {
  return keepArrayObjects.indexOf( el ) >  0;
} );

console.log(originalArray); 

我已尝试使用上面的代码来删除对象“TotalSI”、“Salary”并保留 keepArrayObjects 数组中列出的对象，但它不起作用。

我想更新原始数组本身，请帮助我。

Answer 1

您可以映射想要的条目并获取新对象。

let array = [{ id: 1, NoOfEmp: 12, Wages: 1000, TotalSI: 21, Salary: 3000 }, { id: 2, NoOfEmp: 13, Wages: 2000, TotalSI: 22,  Salary: 4000 }],
    keys = ['id', 'NoOfEmp', 'Wages'],
    result = array.map(o => Object.fromEntries(keys.map(k => [k, o[k]])));

console.log(result);

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IE兼容版本

var array = [{ id: 1, NoOfEmp: 12, Wages: 1000, TotalSI: 21, Salary: 3000 }, { id: 2, NoOfEmp: 13, Wages: 2000, TotalSI: 22,  Salary: 4000 }],
    keys = ['id', 'NoOfEmp', 'Wages'],
    result = array.map(function (source) {
        return keys.reduce(function (target, k) {
            target[k] = source[k];
            return target;
        }, {});
    });

console.log(result);

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