You want to write a resolver that returns the full name by combining parent.firstName and parent.lastName. Which of the following resolver signatures and implementations is correct?
hard📝 Application Q8 of 15
GraphQL - Resolvers
You want to write a resolver that returns the full name by combining parent.firstName and parent.lastName. Which of the following resolver signatures and implementations is correct?
Step 1: Identify where firstName and lastName come from
These are properties of the parent object, so the resolver must accept parent as the first argument.
Step 2: Check each option's argument and usage
Only function resolver(parent) { return `${parent.firstName} ${parent.lastName}`; } uses parent and accesses firstName and lastName correctly; others use wrong arguments.
Final Answer:
function resolver(parent) { return `${parent.firstName} ${parent.lastName}`; } -> Option A
Quick Check:
Use parent for parent fields data [OK]
Quick Trick:Use parent to access parent field data in resolver [OK]
Common Mistakes:
Using args instead of parent for parent data
Using context or info incorrectly
Not combining names properly
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