List types in GraphQL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a list of integers in GraphQL schema.

GraphQL

type Query { numbers: [[1]] }

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

AString

BInt

CBoolean

DFloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using String instead of Int for a list of numbers.

Forgetting to use square brackets for list types.

The list type in GraphQL is defined by wrapping the type in square brackets. Here, Int is the correct scalar type for integers.

2fill in blank

medium

Complete the code to define a list of non-nullable strings in GraphQL schema.

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 Int instead of String for text lists.

Placing the exclamation mark outside the brackets instead of after the type.

The exclamation mark ! after the type means the list elements cannot be null. Here, String is the correct scalar type for text.

3fill in blank

hard

Fix the error in the list type definition to make the list itself non-nullable but allow nullable elements.

GraphQL

type Query { items: [1] }

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

AString

BString!

C[String!]

D[String]!

Attempts:

3 left

💡 Hint

Common Mistakes

Putting exclamation mark after the type instead of after the list.

Using String! without brackets which is not a list.

To make the list non-nullable but allow nullable elements, place the exclamation mark after the closing bracket: [String]!.

4fill in blank

hard

Fill both blanks to define a list of non-nullable integers where the list itself is also non-nullable.

GraphQL

type Query { scores: [1][2] }

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

A[

BInt!

C]!

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Placing exclamation marks in the wrong positions.

Forgetting to wrap the type in brackets.

The correct syntax for a non-nullable list of non-nullable integers is [Int!]!. The list is wrapped in brackets with exclamation marks after the type and after the brackets.

5fill in blank

hard

Fill both blanks to define a GraphQL input type with a field that is a non-nullable list of nullable floats.

GraphQL

input FilterInput { values: [1][2] }

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

A[

BFloat

C]!

DFloat!

Attempts:

3 left

💡 Hint

Common Mistakes

Using Float! inside the list which makes elements non-nullable.

Placing exclamation mark after the type instead of after the brackets.

The field values is a non-nullable list (] followed by !) of nullable floats (Float without exclamation mark). So the correct syntax is [Float]!.