[Solved] Given this resolver code snippet:const resolver = (parent, args, context) => {... };What will resolver(null, {id: 5}, context) return if context.db.getUserById(5) returns { id: 5, name: 'Alice' }? | GraphQL

GraphQL - Resolvers

Given this resolver code snippet:

const resolver = (parent, args, context) => {
  return context.db.getUserById(args.id);
};

What will resolver(null, {id: 5}, context) return if context.db.getUserById(5) returns { id: 5, name: 'Alice' }?

Anull

B{ id: 5, name: 'Alice' }

Cundefined

DError: getUserById is not a function

Step-by-Step Solution

Solution:

Step 1: Understand the resolver call
The resolver calls context.db.getUserById with args.id which is 5.
Step 2: Check the return value from context
Given context.db.getUserById(5) returns { id: 5, name: 'Alice' }, the resolver returns this object.
Final Answer:
{ id: 5, name: 'Alice' } -> Option B
Quick Check:
Resolver returns context.db.getUserById(args.id) result [OK]

Quick Trick: Resolver returns what context function returns for given args [OK]

Common Mistakes:

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