Typescript X is not a function

Question

I have a problem with my code. I have no error when I compile my code, but I have a console error: this.trackArray[0].points.getVector() is not a function.

Here is my code where I call this function

const vecteurPoints: THREE.Vector3[] = this.trackArray[0].points.getVector();

Here is the function

public getVector(): Vector3[] {
    const vecArray: Vector3[] = new Array();
    for (const i of this.coordX) {
        vecArray[i].x = this.coordX[i];
        vecArray[i].y = this.coordY[i];
        vecArray[i].z = this.coordZ[i];
    }

    return vecArray;
}

In VS Code, when I ctrl+click on the function it sends me to the function definition.

I get my trackArray with a call to an API.

export class AdminService {
    public constructor( private http: HttpClient ) {  }

    public getTracks(): Observable<Track[]> {
        return this.http.get<Track[]>(this.ADMIN_URL).pipe(catchError(this.handleError<Track[]>("getTracks"))
        );
 }

And I call this class like this

 this.admin.getTracks().subscribe((track: Track[]) => {this.trackArray = track; });

Also, the getVector() function is problematic, because it tries to set properties on vecArray[i], when vecArray[i] hasn't been created yet — kingdaro
– kingdaro, Commented Apr 2, 2018 at 1:54

Mohamed-Ali Elakhrass · Accepted Answer · 2018-04-02 02:23:53Z

1

I found my problem! Because I got the trackArray with JSON, I had to instantiate a new track to apply my method! Thank you all for your help

answered Apr 2, 2018 at 2:23

Mohamed-Ali Elakhrass

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Comments

Sajeetharan · Accepted Answer · 2018-04-02 01:59:54Z

0

This could happen if this.trackArray does not contain elements. Add a null check

if(this.trackArray && this.trackArray[0]){
  const vecteurPoints: THREE.Vector3[] = this.trackArray[0].points.getVector();
}

edited Apr 2, 2018 at 1:59

answered Apr 2, 2018 at 1:52

Sajeetharan

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2 Comments

kingdaro Over a year ago

If we know that trackArray is an array, and we know that each item in it has a points property, I think the only thing we should have to check is if (this.trackArray[0])

Mohamed-Ali Elakhrass Over a year ago

I used a console.log and the track have an element

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