import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import java.util.*; @RestController public class CheckoutController { @GetMapping("/checkout") public Map checkout( @RequestParam String products, @RequestParam(required = false) String coupon) { // Parse products Map productQuantities = new HashMap<>(); for (String productEntry : products.split(",")) { String[] parts = productEntry.split(":"); productQuantities.put( parts[0], // Item group ID Integer.parseInt(parts[1]) // Quantity ); } // Build result Map result = new HashMap<>(); result.put("products", productQuantities); result.put("coupon", coupon != null ? coupon : "No coupon applied"); return result; } }

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const express = require('express'); const app = express(); app.get('/checkout', (req, res) => { const products = req.query.products; const coupon = req.query.coupon; // Parse products const productQuantities = {}; for (const productEntry of products.split(',')) { const [itemgroupId, quantity] = productEntry.split(':'); productQuantities[itemgroupId] = parseInt(quantity); } // Build result const result = { products: productQuantities, coupon: coupon || 'No coupon applied', }; res.json(result); }); const port = 3000; app.listen(port, () => { console.log(`Server listening on port ${port}`); });