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Grokking Node.js Design Patterns for Interviews

Solution: Build a Minimal Email Template Builder

Explore how to build a minimal email template builder applying the Builder pattern with fluent APIs. Learn to chain methods for setting email fields, validate required inputs, and produce well-structured transactional emails, improving code clarity and reliability.

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Solution explanation

  • Lines 2–4: We initialize an empty email object inside the constructor to hold field values as we build the message.

  • Lines 6–19: We define fluent setter methods (to, withSubject, withBody) that update the internal state and return this, letting us chain calls in any order.

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