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

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.

@JacopoSciampi I put the Object.keys(obj).length below the this.days.forEach((x: any) => { .... }});.. it returns 3 — ABC
– ABC, Commented Nov 29, 2019 at 8:56

Francesco · Accepted Answer · 2019-11-29 09:04:30Z

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.

edited Nov 29, 2019 at 9:04

answered Nov 29, 2019 at 8:55

Francesco

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3 Comments

ABC Over a year ago

it return 7, it should return 1, 1, 7

ABC Over a year ago

1 for date: 2019-11-24, 1 for date: 2019-11-25 then 7 for date: 2019-11-30

Francesco Over a year ago

I updated the answer, and the new code returns what you need.

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