将计数值添加到具有相同键值的对象（对象数组的数组）

Question

您好，我要对一组对象进行复杂的迭代。 我在 Javascript 中有这样的数组：

arr = [
 [{ apiName: 'app/abc', error: '', res: 'response' }],
 [{ apiName: 'app/abc', error: '', res: 'response' }],
 [{ apiName: 'app/abc', error: '', res: 'response' }],
 [{ apiName: 'app/abc', error: 'error's', res: 'response' }],
 [{apiName: 'app/abc', error: 'no error's', res: 'response' }],
 [{apiName: 'app/abc', error: 'no error's', res: 'response' }],
 [{ apiName: 'app/abc', error: '', res: 'response' }],
]

我想为每个对象添加 count 属性，以计算具有相同名称和姓氏的对象......所以现在应该是：

[
 { apiName: 'app/abc', error: '', count: 4 },
 { apiName: 'app/abc', error: 'Sheth', count: 2 },
 { apiName: 'app/abc', error: 'Sen', count: 1' },
]

这是我的代码：

// It works only for array of objects
let summary;
for(i=0; i<arr.length; i++){
 summary = Object.values(arr[i].reduce((a,{apiName, error}) => {
  let k = `${apiName}_${error}`;
  a.push(a[k] = a[k] || {apiName, error, count : 0});
  a[k].count++;
  return a;
 },[]));
}

Answer 1

您需要减少嵌套数据结构并省略推送到公共键。 而是使用带有键和计数的对象。

 const data = [[{ apiName: 'app/abc', error: '', res: 'response' }], [{ apiName: 'app/abc', error: '', res: 'response' }], [{ apiName: 'app/abc', error: '', res: 'response' }], [{ apiName: 'app/abc', error: 'error', res: 'response ' }], [{ apiName: 'app/abc', error: 'no error', res: 'response' }], [{ apiName: 'app/abc', error: 'no error', res: 'response ' }], [{ apiName: 'app/abc', error: '', res: 'response' }]], summary = Object.values(data.reduce((r, array) => array.reduce((a, { apiName, error }) => { const key = `${apiName}_${error}`; a[key]??= { apiName, error, count: 0 }; // or a[key] = a[key] || { apiName, error, count: 0 }; a[key].count++; return a; }, r), [])); console.log(summary);

 .as-console-wrapper { max-height: 100%;important: top; 0; }