Angular2 filter array of objects

Question

i will start by adding the code, result i get and in the end what i would like to obtain and if it is possible.

The result which i'm getting is Array[object, object, ...] where object is Array

export class SomeService {
           ....
           .... 
     public someFunction(): MyObject[]{
         Observable
            .forkJoin(this.userItemsA(userId), this.userItemsB(userId), etc)
             .filter(each => {
                      for (let array of each) {
                            let x: any = <any> array;
                               return x.length > 0;
                            }
                        })
             .map(result => {
                   return result;
              })
            .subscribe(result => {
                  /// what i would like to do for example assuming only 1st array has items
                  /// do something here with result[0] 
                  /// return MyObject[] from result[0]
        });
    ....
    }
}

Filter structure

I'm in my early learning stage of angular2 and reactive programming, what i would like is to filter so that the map result will be only the arrays that have at least 1 item.

Thank you

What's the structure of your data in .filter(each => ...?

martin
– martin

2016-11-07 12:16:15 +00:00
Commented Nov 7, 2016 at 12:16 — martin
– martin, Commented Nov 7, 2016 at 12:16
i've uploaded the structure of the filter, thx

Remus
– Remus

2016-11-07 12:24:32 +00:00
Commented Nov 7, 2016 at 12:24 — Remus
– Remus, Commented Nov 7, 2016 at 12:24

martin · Accepted Answer · 2016-11-07 12:25:46Z

1

Instead of .filter use .map

.map(each => {
    return each.filter(array => array.length > 0)
}

answered Nov 7, 2016 at 12:25

martin

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Comments

Miroslav Jonas · Accepted Answer · 2016-11-07 12:38:12Z

1

Unfortunately this doesn't work with forkJoin. What it does it joins several Observables into single Observable, thus if any of them is filtered out, the entire joined Observable get's interrupted/filtered.

As @Martin stated, you have to do your filtering in the map branch.

answered Nov 7, 2016 at 12:38

Miroslav Jonas

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