An effective way to extract targeted information from an array of objects using Typescript

I'm having trouble extracting the IDs from the selected items in my PrimeNG DataTable. Despite searching on Google, I couldn't find much information about the error I'm encountering...

ERROR in C:/Users/*****/Documents/Octopus/Octopus 2.0/src/app/gebruikers/gebruikers.component.ts (200,33): Type must have a '[Symbol.iterator]()' method that returns an iterator.)

Below is the 'interface' I am using:

export interface Departement {
DepName;
ID;
}

This is the snippet of my html code:

<p-dataTable [value]="departementen" [rows]="3" class="thumbnail" resizableColumns="true" [paginator]="true" [pageLinks]="0" 
            [rowsPerPageOptions]="[3,5,10]" [globalFilter]="gbDepartementen" emptyMessage=""
            [(selection)]="NGSelectedDepartementen">
            <p-column [style]="{'width':'30px'}" selectionMode="multiple"></p-column>
            <p-column [style]="{'width':'40px'}" field="ID" header="ID"></p-column>
            <p-column field="DepName" header="Departement"></p-column>
        </p-dataTable>

This is the part of my component code where I encounter issues:

NGSelectedDepartementen: Departement;
for (let x of this.NGSelectedDepartementen) {
                console.log(x.ID);
}

When I select two 'departementen', this is the content of NGSelectedDepartementen:

Array[2]
0:Object
DepName:"Koninklijke Academie voor Schone Kunsten Antwerpen"
  ID:16
  __proto__:Object
1:Object
  DepName:"Koninklijk Conservatorium Antwerpen"
  ID:17
  __proto__:Object
length:2
__proto__:Array[0]

Could someone provide me with example code on how to correctly implement this?

Answer

Your NGSelectedDepartementen variable should be of type Departement[] instead of Departement. Unless the Departement instance is a class implementing the Iterable interface.

NGSelectedDepartementen: Departement[];

Answer by n00dl3

Answer №1

Make sure that your variable NGSelectedDepartementen is declared as an array of type Departement[] instead of just Departement. However, if the instance of Departement is a class that implements the Iterable interface, then it can remain as is.

NGSelectedDepartementen: Departement[];

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