...

Solution: Model a GraphQL Query Using a Nested Builder

Implement a recursive, fluent builder that outputs correctly nested GraphQL query strings from chained field and subfield calls.

We'll cover the following...

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 ...

Solution: Model a GraphQL Query Using a Nested Builder