Args argument in GraphQL - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ query_result

intermediate

What is the output of this GraphQL query with args?

Given the schema where books query accepts an argument author to filter books by author name, what will be the result of this query?

{ books(author: "Alice") { title author } }

GraphQL

query { books(author: "Alice") { title author } }

A [{"title": "GraphQL Basics", "author": "Alice"}, {"title": "Advanced GraphQL", "author": "Bob"}]

B [{"title": "Advanced GraphQL", "author": "Bob"}]

C []

D [{"title": "GraphQL Basics", "author": "Alice"}, {"title": "Advanced GraphQL", "author": "Alice"}]

💡 Hint

Think about how the argument filters the list of books by author.

The argument author: "Alice" filters the books to only those written by Alice. So only books with author Alice appear in the result.

📝 Syntax

intermediate

Which option correctly uses args in a GraphQL query?

Choose the valid GraphQL query syntax that passes an argument id with value 5 to the user query.

A query { user(id: 5) { name email } }

B query { user { id: 5, name, email } }

C query { user(id = 5) { name email } }

D query { user(id => 5) { name email } }

💡 Hint

Remember the syntax for passing arguments uses parentheses and colon.

Option A correctly uses parentheses and colon to pass argument id: 5. Options C and D use invalid operators. Option A tries to assign inside selection set which is invalid.

🧠 Conceptual

advanced

How do args improve GraphQL queries?

Which statement best explains the role of arguments (args) in GraphQL queries?

A Args define the schema structure and types for the GraphQL server.

B Args allow clients to specify parameters to filter or customize the data returned by a query.

C Args are used to authenticate users before running queries.

D Args automatically cache query results on the client side.

💡 Hint

Think about how you can ask for specific data using arguments.

Arguments let clients pass parameters to queries or mutations to control what data is returned or how it is processed. They do not define schema or handle authentication directly.

🔧 Debug

advanced

Why does this GraphQL query with args cause an error?

Consider this query:

query { product(id: "abc123") { name price } }

The server returns an error: Argument "id" has invalid value "abc123". What is the most likely cause?

A The argument <code>id</code> expects an integer, but a string was provided.

B The argument <code>id</code> is missing from the query.

C The field <code>product</code> does not accept any arguments.

D The query is missing a required <code>price</code> argument.

💡 Hint

Check the expected type of the argument in the schema.

The error indicates the value type is wrong. If id expects an integer, passing a string causes this error.

❓ optimization

expert

How can args optimize data fetching in GraphQL?

You want to fetch only active users from a large database. Which use of args best optimizes the query?

A query { users(filter: {active: true}) { id name } }

B query { users { id name status } }

C query { users(status: "active") { id name } }

D query { users { id name } }

💡 Hint

Consider which query reduces data transferred and server load by filtering early.

Option C uses an argument to filter users on the server side, returning only active users. Option C fetches all users with status, increasing data size. Option C fetches all users without filtering. Option C uses a filter argument but may not be supported or less standard.