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Grokking Node.js Design Patterns for Interviews

Solution: Build a Flexible Product Query Builder

Explore how to implement a flexible ProductQueryBuilder using the Builder pattern. Learn to design chainable methods that let you compose complex, well-structured product search queries in Node.js with clean, readable code and no undefined fields.

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Solution explanation

  • Lines 2–7: We define independent internal fields for each filter (category, minPrice, maxPrice, tags), keeping state isolated and flexible.

  • Lines 9–27: We implement fluent setter methods that assign filter values and return this, allowing any combination or order of chained calls.

  • Lines 29–47: In .build(), we ...