8 Agentic Coding Patterns That Ship 10x Faster (Cursor, Windsurf, Claude Code)

To implement the functionality described in the test cases, we need to create a service that handles creating and sending invoices. The service should validate the input data according to the rules specified in the tests.

Here's how you can implement this:

1. Define the Invoice Model: This will include properties like customerId, lineItems, taxRate, dueDate, etc.
2. Create a Service Class: This class will handle creating and sending invoices, ensuring all validations are met.

Let's start by defining the invoice model:

typescript
 
1interface LineItem {
2    description: string;
3    quantity: number;
4    unitPrice: number;
5}
6
7interface Invoice {
8    id: string; // Unique identifier for each invoice
9    customerId: string;
10    lineItems: LineItem[];
11    taxRate?: number;
12    dueDate: Date;
13    status: 'draft' | 'sent';
14}

Next, we'll create the service class:

typescript
 
1class InvoiceService {
2    private invoices: Invoice[] = [];
3
4    // Helper function to generate a unique ID for each invoice
5    private generateId(): string {
6        return Math.random().toString(36).substring(2);
7    }
8
9    async createInvoice(data
10
11[Read the full article at DEV Community](https://dev.to/dohkoai/8-agentic-coding-patterns-that-ship-10x-faster-cursor-windsurf-claude-code-2h0j)
12
13---
14
15**Want to create content about this topic?** [Use Nemati AI tools](https://nemati.ai) to generate articles, social posts, and more.