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Grokking Node.js Design Patterns for Interviews

Solution: Sort Reports with Pluggable Algorithms

Explore how to implement the Strategy Pattern to enable flexible report sorting by name, date, or score. This lesson guides you in defining interchangeable sorting strategies and a context class that swaps algorithms at runtime without conditional logic, making your Node.js code easier to maintain and extend.

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Solution explanation

  • Lines 2–23: We define three interchangeable sorting strategy classes: NameSortStrategy, DateSortStrategy, and ScoreSortStrategy.

    • Each class exposes a .sort() method, ensuring all strategies follow a common interface.

    • NameSortStrategy alphabetically sorts by the name field.

    • DateSortStrategy compares Date objects to sort chronologically.

    • ScoreSortStrategy orders by score in descending order. ...