How to check if an object key is in another object of objects

user_2690257 0
Viewed 144

I have the following objects:

const allMembers = {
    "-Lz8YxHiwp8QZW3TqAFn": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHiwp8QZW3TqAFn"
    },
    "-Lz8YxHqQXWoaGOFRLrO": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHqQXWoaGOFRLrO"
    },
    "-Lz8YxHsMItaaTVNyQRE": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHsMItaaTVNyQRE"
    },
    "-Lz8YxHwuVBMWl0Go6C5": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHwuVBMWl0Go6C5"
    },
    "-Lz8YxHy0S-QkDaE1PkX": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHy0S-QkDaE1PkX"
    },
}

const attendanceData = {
    "-Lz8YxHiwp8QZW3TqAFn": true,
    "-Lz8YxHqQXWoaGOFRLrO": true,
    "-Lz8YxHsMItaaTVNyQRE": true,
    "-Lz8YxHwuVBMWl0Go6C5": false,
    "-Lz8YxHy0S-QkDaE1PkX": true,
    "-Lz8YxIFA1XGVmaNfNr3": false,
    "-Lz8YxIJVZnIIj7RgEzg": false,
}

I need to clean up the allMembers to only return if it's found as true in attendanceData. Here is my attempt but it's obviously not working. Also the way I'm doing it has to loop the first one over the other times.

const membersHere = Object.keys(allMembers).filter(memEl => Object.keys(attendanceData).find(attendEl => memEl == attendEl));
javascript
3 Answers

const 
  allMembers = {'-Lz8YxHiwp8QZW3TqAFn': {first: 'foo',last: 'bar',uid: '-Lz8YxHiwp8QZW3TqAFn'},'-Lz8YxHqQXWoaGOFRLrO': {first: 'foo',last: 'bar',uid: '-Lz8YxHqQXWoaGOFRLrO'},'-Lz8YxHsMItaaTVNyQRE': {first: 'foo',last: 'bar',uid: '-Lz8YxHsMItaaTVNyQRE'},'-Lz8YxHwuVBMWl0Go6C5': {first: 'foo',last: 'bar',uid: '-Lz8YxHwuVBMWl0Go6C5'},'-Lz8YxHy0S-QkDaE1PkX': {first: 'foo',last: 'bar',uid: '-Lz8YxHy0S-QkDaE1PkX'}},
  attendanceData = {'-Lz8YxHiwp8QZW3TqAFn': true,'-Lz8YxHqQXWoaGOFRLrO': true,'-Lz8YxHsMItaaTVNyQRE': true,'-Lz8YxHwuVBMWl0Go6C5': false,'-Lz8YxHy0S-QkDaE1PkX': true,'-Lz8YxIFA1XGVmaNfNr3': false,'-Lz8YxIJVZnIIj7RgEzg': false},
  filteredMembers = Object.fromEntries(
    Object.entries(allMembers).filter(([k]) => attendanceData[k])
  );

console.log(filteredMembers);

You can also do it using Array.prototype.reduce

const 
  allMembers = {'-Lz8YxHiwp8QZW3TqAFn': {first: 'foo',last: 'bar',uid: '-Lz8YxHiwp8QZW3TqAFn'},'-Lz8YxHqQXWoaGOFRLrO': {first: 'foo',last: 'bar',uid: '-Lz8YxHqQXWoaGOFRLrO'},'-Lz8YxHsMItaaTVNyQRE': {first: 'foo',last: 'bar',uid: '-Lz8YxHsMItaaTVNyQRE'},'-Lz8YxHwuVBMWl0Go6C5': {first: 'foo',last: 'bar',uid: '-Lz8YxHwuVBMWl0Go6C5'},'-Lz8YxHy0S-QkDaE1PkX': {first: 'foo',last: 'bar',uid: '-Lz8YxHy0S-QkDaE1PkX'}},
  attendanceData = {'-Lz8YxHiwp8QZW3TqAFn': true,'-Lz8YxHqQXWoaGOFRLrO': true,'-Lz8YxHsMItaaTVNyQRE': true,'-Lz8YxHwuVBMWl0Go6C5': false,'-Lz8YxHy0S-QkDaE1PkX': true,'-Lz8YxIFA1XGVmaNfNr3': false,'-Lz8YxIJVZnIIj7RgEzg': false},
  filteredMembers = Object.entries(allMembers).reduce(
    (r, [k, v]) => (attendanceData[k] && (r[k] = v), r),
    {}
  );

console.log(filteredMembers);

Other relevant documentations:

user_190956300

You can use reduce method:

const allMembers = {
    "-Lz8YxHiwp8QZW3TqAFn": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHiwp8QZW3TqAFn"
    },
    "-Lz8YxHqQXWoaGOFRLrO": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHqQXWoaGOFRLrO"
    },
    "-Lz8YxHsMItaaTVNyQRE": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHsMItaaTVNyQRE"
    },
    "-Lz8YxHwuVBMWl0Go6C5": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHwuVBMWl0Go6C5"
    },
    "-Lz8YxHy0S-QkDaE1PkX": {
        "first": "foo",
        "last": "bar",
        "uid": "-Lz8YxHy0S-QkDaE1PkX"
    },
}

const attendanceData = {
    "-Lz8YxHiwp8QZW3TqAFn": true,
    "-Lz8YxHqQXWoaGOFRLrO": true,
    "-Lz8YxHsMItaaTVNyQRE": true,
    "-Lz8YxHwuVBMWl0Go6C5": false,
    "-Lz8YxHy0S-QkDaE1PkX": true,
    "-Lz8YxIFA1XGVmaNfNr3": false,
    "-Lz8YxIJVZnIIj7RgEzg": false,
}

const reduced = Object.entries(allMembers).reduce((data, [key, value]) => {
  if (attendanceData[key] ?? false)
    data[key] = value;
  return data;  
}, {});

console.log(reduced);

user_70987580

You can combine Object.keys(), Array.prototype.filter() and Array.prototype.reduce()

Code:

const allMembers = {'-Lz8YxHiwp8QZW3TqAFn': {first: 'foo',last: 'bar',uid: '-Lz8YxHiwp8QZW3TqAFn',},'-Lz8YxHqQXWoaGOFRLrO': {first: 'foo',last: 'bar',uid: '-Lz8YxHqQXWoaGOFRLrO',},'-Lz8YxHsMItaaTVNyQRE': {first: 'foo',last: 'bar',uid: '-Lz8YxHsMItaaTVNyQRE',},'-Lz8YxHwuVBMWl0Go6C5': {first: 'foo',last: 'bar',uid: '-Lz8YxHwuVBMWl0Go6C5',},'-Lz8YxHy0S-QkDaE1PkX': {first: 'foo',last: 'bar',uid: '-Lz8YxHy0S-QkDaE1PkX',},}

const attendanceData = {'-Lz8YxHiwp8QZW3TqAFn': true,'-Lz8YxHqQXWoaGOFRLrO': true,'-Lz8YxHsMItaaTVNyQRE': true,'-Lz8YxHwuVBMWl0Go6C5': false,'-Lz8YxHy0S-QkDaE1PkX': true,'-Lz8YxIFA1XGVmaNfNr3': false,'-Lz8YxIJVZnIIj7RgEzg': false,}
  
const result = Object
  .keys(allMembers)
  .filter((k) => attendanceData[k])
  .reduce((a, k) => (a[k] = allMembers[k], a), {})

console.log(result)

user_19325520
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