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Grokking Node.js Design Patterns for Interviews

Solution: Calculate Prices for Experiment Groups

Explore how to apply the Strategy Pattern to implement dynamic pricing algorithms for different experiment groups in Node.js. Understand how to encapsulate pricing strategies like conservative, aggressive, and dynamic markups, and swap these strategies at runtime without altering core business logic.

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Solution explanation

  • Lines 2–22: We define three distinct pricing strategies: ConservativePricing, AggressivePricing, and DynamicPricing.

    • Each exposes .calculate(basePrice) and returns a formatted numeric price.

    • ConservativePricing applies a 5% markup for stability.

    • AggressivePricing applies a 25% markup to maximize margin.

    • ...