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Grokking Node.js Design Patterns for Interviews

Solution: Implement a Chainable Logger Config Builder

Explore how to create a chainable LoggerConfigBuilder class that enables fluent setting of log level, output format, and destinations. Understand enforcing configuration rules and building valid logger objects step-by-step with Node.js design patterns.

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Solution explanation

  • Lines 2–6: We initialize internal fields for level, format, and outputs, keeping all output targets organized under a single object.

  • Lines 8–31: We define fluent setter methods that configure the logger—setLevel, useJsonFormat, and the destination methods (toConsole, toFile, toRemote). Each updates the relevant field and returns this to enable chaining.

  • Lines 34–40: In .build() ...