Why schema defines the API contract in GraphQL - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a GraphQL schema with a Query type.

GraphQL

type Query { hello: [1] }

Drag options to blanks, or click blank then click option'

Afloat

BString

Cboolean

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase types like 'int' instead of 'Int'.

Using non-existent scalar types.

The String type is the correct GraphQL scalar type for text values.

2fill in blank

medium

Complete the code to define a schema with a Query type that returns a list of strings.

GraphQL

type Query { names: [[1]] }

Drag options to blanks, or click blank then click option'

AInt

BBoolean

CString

DFloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using a scalar type that does not match the list content.

Forgetting the brackets for list types.

The list contains String elements, so the type inside brackets is String.

3fill in blank

hard

Fix the error in the schema by completing the type definition for a User object.

GraphQL

type User { id: ID! name: [1]! }

Drag options to blanks, or click blank then click option'

AInt

BFloat

CBoolean

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using Int or Boolean for a name field.

Omitting the exclamation mark for required fields.

The name field should be a non-nullable String type.

4fill in blank

hard

Fill both blanks to define a schema with a Query that returns a User by ID.

GraphQL

type Query { user(id: [1]!): [2] }

Drag options to blanks, or click blank then click option'

AID

BString

CUser

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using String instead of ID for the id argument.

Returning String instead of User.

The id argument should be of type ID! and the return type is User.

5fill in blank

hard

Fill all three blanks to define a mutation that creates a User with a name and returns the User.

GraphQL

type Mutation { createUser(name: [1]!): [2] } type User { id: [3]! name: String! }

Drag options to blanks, or click blank then click option'

AString

BUser

CID

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using Int for name or id fields.

Returning String instead of User from mutation.

The name argument is a non-nullable String, the mutation returns a User, and the User's id is a non-nullable ID.