Solution: Model a GraphQL Query Using a Nested Builder

Explore how to implement a GraphQL query builder that uses a nested, fluent API. Learn to add flat and nested fields programmatically, generating properly indented GraphQL query strings to simplify backend server communication.

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Solution explanation
Revisit the problem statement

Solution explanation

Lines 2–4: We initialize an empty fields array to store the query structure. Each element represents a field and may optionally include nested subfields.
Lines 6–9: We define .field(), which adds a simple field name to the list—no nesting, just a flat property. It returns this to enable chaining.
Lines 11–16: We implement .select(), which handles nested fields.
- It creates a new sub-builder instance and passes it to the callback.
- The callback populates subfields on that builder.
- We then ...

1.Introduction to Node.js Patterns

2.Factory Pattern: Generate Config-Driven Services Dynamically

3.Builder Pattern: Assemble Complex Objects with Fluent APIs

4.Decorator Pattern: Extend Behavior Without Modifying Core Logic

5.Adapter Pattern: Standardize Interface Across Dependencies

6.Proxy Pattern: Intercept and Control Access Transparently

7.Strategy Pattern: Swap Algorithms Based on Context

8.Wrapping Up

Solution: Model a GraphQL Query Using a Nested Builder

Solution explanation