`In TypeScript Angular, encountering challenges with accessing object properties`

My TypeScript object looks like this

const playlist: { tracks: Array<Track> } = { tracks: new Array<Track>() };

This is the Track interface I am working with

interface Track {
  title?: string;
  album?: string;
  artists?: string;
  duration?: string;
  explicit?: boolean;
  url?: string;
}

I am fetching data from the Spotify web API to populate my playlist object as shown below

for (let i = 1; i <= iterationCount; i++) {
    const endpointX = `${BASE_API_URL}playlists/${playlistId}/tracks?limit=${PLAYLIST_ITEM_LIMIT}&offset=${i}&fields=${fieldString}`;
    const subscription: Subscription = this.http.get<WritableTrackList>(endpointX).subscribe(data => {
      for (const item of data.items) {
        const track: Track = this.helperService.trackApiObject2TrackObject(item.track);
        this.playlist.tracks.push(track);
      }
    });    
}

When I log the playlist object in the JavaScript console using console.log(this.playlist);, it displays correctly. https://i.stack.imgur.com/KrFGt.png

However, when I try to access the playlist.tracks property using 

console.log(this.playlist.tracks);
, it shows an empty array

https://i.stack.imgur.com/5V62a.png

Why am I unable to access the tracks property of the playlist object? How can I resolve this issue?

javascriptangulartypescriptspotify

Answer №1

Give this a shot:

console.log(this.playlist['tracks']);

To access it as this.playlist.tracks, you need to define an interface for the playlist:

interface PlayList{
tracks:Track[]
}

Answer №2

Perhaps consider outputting it within the subscription block.

    .subscribe(data => {
          for (const item of data.items) {
            const track: Track = this.helperService.convertApiTrack(item.track);
            this.playlist.tracks.push(track);
          }

console.log([...this.playlist.tracks])

        }); 

// Attempting to print outside of the subscription may result in an empty array

While typically aiming for a more reactive approach

tracks$ = this.http.get<WritableTrackList>(newEndpoint).pipe(map(convertApiTrack));

Then, in the HTML template:

<ng-template ngFor let-track[ngForOf]="tracks$| async">
<app-track [track]></app-track>
</ng-template>

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