Grokking Node.js Design Patterns for Interviews/

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Solution: Apply Flexible Discounts for Marketing Campaigns

Solution: Apply Flexible Discounts for Marketing Campaigns

Implement self-contained discount strategies and delegate discount calculation through a configurable DiscountService context.

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Solution explanation

  • Lines 2–22: We define three discount strategies: FlatDiscount, PercentageDiscount, and LoyaltyDiscount.

    • Each strategy encapsulates a distinct pricing rule through a .calculate() method.

    • FlatDiscount applies a fixed numeric deduction.

    • PercentageDiscount multiplies the subtotal to simulate a percentage-based reduction.

    • LoyaltyDiscount simulates a loyalty-tier reduction, representing customer-specific logic.

  • Lines 25–38: ...