Practical GraphQL - Become a GraphQL Ninja - GraphQL Queries with Parameters

The video tutorial explains how to update a GraphQL query type to return a single user by creating a resolver function. It covers passing arguments to the query, handling non-nullable fields, and using console logs for testing. The tutorial demonstrates filtering users by ID using JavaScript's filter method and ensuring the correct data type is returned to meet GraphQL expectations.

What is the purpose of the resolver function for user in the context of the query?

How do we specify which user to get in the query?

What is the significance of the ID being non-nullable in the query?

Explain the process of extracting arguments using object destructuring.

How does the filter method work in JavaScript when applied to the users array?

What error occurs if the resolver function returns null for a non-nullable field?

What is the expected return type when querying for a single user?