How do I implement discount functionality effectively?

[Silent-Watcher]

How do I implement discount functionality effectively? please also provide me code snippet as well

[MrReval]

Hi Silent Watcher

I Would Suggest You This Approach :

To implement discount functionality:
Types of Discounts:
Percentage (e.g., 10% off).
Fixed Amount (e.g., $20 off).
Buy X, Get Y Free.
Category or User-Specific.
Time-Based Discounts.
Database Design:
Store discount details (ID, type, value, validity, applicable products/users).
Track usage limits and quotas.
Logic:
Validate eligibility (active, applicable, within limits).
Apply discounts sequentially if stacking is allowed.
Prevent negative pricing (Math.max(finalPrice, 0)).
Server-Side Security:
Validate discounts server-side to prevent tampering.
Restrict discount generation and usage to authorized users.
User Interface:
Show applied discounts, savings, and final price.
Notify users of invalid or expired discounts.
Testing:
Verify combinations, edge cases, and usage scenarios.

const applyDiscount = (price, discount) => {     if (discount.type === "percentage") return Math.max(price - (price * discount.value) / 100, 0);     if (discount.type === "fixed") return Math.max(price - discount.value, 0);     return price; }; console.log(applyDiscount(100, { type: "percentage", value: 10 })); // Output: 90

[Silent-Watcher]

thank you for your contribution