DutchTreat/client/src/app/shared/Order.ts

export class OrderItem {
    id!: number;
    quantity!: number;
    unitPrice!: number;
    productId!: number;
    productSize!: string;
    productTitle!: string;
    productArtist!: string;
    productArtId!: string;
    productCategory!: string;
}

export class Order {
    orderId!: number;
    orderDate: Date = new Date();
    orderNumber: string = Math.random().toString(36).substr(2,5);
    items: OrderItem[] = [];

    get subtotal(): number {
        const result = this.items.reduce(
            (tot, val) => {
                return tot + (val.unitPrice * val.quantity);
        }, 0);
        return result;
    }

}