Grokking Node.js Design Patterns for Interviews/

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Solution: Build a Simple Validation Rule Builder

Solution: Build a Simple Validation Rule Builder

Construct basic input validation rules using a fluent, chainable API.

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Solution explanation

  • Line 3: We initialize an empty rules object in the constructor to hold validation settings as the builder chain runs.

  • Lines 6–19: We define fluent methods (required, minLength, maxLength) that set rule properties and return this, supporting flexible chaining.

  • Line 22: In .build(), ...