using typescript interface to get compile time error checking Copy

@Injectable()
export class AppComponent {

    title = 'Orders';
-   orders = [{
    orders: order[]= [{
        orderId: 5,
        customerId: "abc"
    },
    {
        orderId: 6,
        customerId: "xyz"
    }];

    click() {
        this.title += "button was clicked";
    }
}
export interface order {
     orderId?: number;
     customerId?: string;
} 

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