How to get array of values with same condition

Question

I have array which i got as a result from nodeJS code

Original JSON data:

JS code:

setInterval(function() {
  var notify = db.get('users')
    .filter({notify: "true"})
    .value()
    console.log("1");
    console.log(notify);

}, 10 * 1000);

Result:

[ { uid: '177098244407558145',
    pubgUser: 'Jengas',
    pubgServer: 'pc-eu',
    notify: 'true' },
  { uid: '407970368847085578',
    pubgUser: 'Lovec_Pokemonov',
    pubgServer: 'pc-eu',
    notify: 'true' },
  { uid: '4307970368847085578',
    pubgUser: 'Lossvec_Pokemonov',
    pubgServer: 'pc-eu',
    notify: 'true' },
  { uid: '407970368847015578',
    pubgUser: 'SDLovec_Pokemonov',
    pubgServer: 'pc-eu',
    notify: 'true' } ]

I wanted to get all uid values which had "true". But result was giving me "undefined" for console.log(notify.uid);

Expected result: 177098244407558145, 407970368847085578, 4307970368847085578, 407970368847015578

Mihai Alexandru-Ionut · Accepted Answer · 2018-05-05 19:51:35Z

3

You can use map method in combination with filter.

For this, you have to pass a callback function for each of the two methods or just use arrow functions which are specific for latest versions of ES.

let data = [ { uid: '177098244407558145', pubgUser: 'Jengas', pubgServer: 'pc-eu', notify: 'true' }, { uid: '407970368847085578', pubgUser: 'Lovec_Pokemonov', pubgServer: 'pc-eu', notify: 'true' }, { uid: '4307970368847085578', pubgUser: 'Lossvec_Pokemonov', pubgServer: 'pc-eu', notify: 'true' }, { uid: '407970368847015578', pubgUser: 'SDLovec_Pokemonov', pubgServer: 'pc-eu', notify: 'true'}  ]
    
uid_array = data.filter(a => a.notify).map(a => a.uid);
console.log(uid_array);

edited May 5, 2018 at 19:51

answered May 5, 2018 at 19:44

Mihai Alexandru-Ionut

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Comments

lovelesh agrawal · Accepted Answer · 2018-05-05 19:57:23Z

1

notify type is string so we need to check with 'true'

let data = [ { uid: '177098244407558145', pubgUser: 'Jengas', pubgServer: 'pc-eu', notify: 'true' }, { uid: '407970368847085578', pubgUser: 'Lovec_Pokemonov', pubgServer: 'pc-eu', notify: 'true' }, { uid: '4307970368847085578', pubgUser: 'Lossvec_Pokemonov', pubgServer: 'pc-eu', notify: 'true' }, { uid: '407970368847015578', pubgUser: 'SDLovec_Pokemonov', pubgServer: 'pc-eu', notify: 'false'}  ]
    
uid_array = data.filter(a => a.notify==='true').map(a => a.uid);
console.log(uid_array);

answered May 5, 2018 at 19:57

lovelesh agrawal

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