如何以角度获取对象数组对象的长度

Question

How to get the length of an object array object in angular.

Here's the code:

list.component.ts

const obj: any = {};
this.days.forEach((x: any) => {
  const itemFilter = this.rowData.filter((item: any) => item);
  itemFilter.forEach((item: any) => {
    const date = format(item.lastpmdate, 'YYYY-MM-DD');
    if (format(x.date, 'YYYY-MM-DD') === date) {
      if (obj[date]) {
        obj[date].push(item);
      } else {
        obj[date] = [item];
      }
    }
  });
});

What I need is to get the length of the object array.

Thanks in advance.

Answer 1

You can list the keys of the target object with Object.keys and then check its length as a normal array:

Object.keys(this.days).length

If you have an object of arrays:

Object.values(this.days).map(v => v.length)

Object.values() allows to iterate over the object values instead of the keys.
Having these, you can then get the length for each of the inner arrays.