List types in GraphQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a List type in GraphQL?

A List type in GraphQL represents an array of values of a specific type. It allows you to return multiple items instead of just one.

beginner

How do you define a List type in a GraphQL schema?

You define a List type by wrapping the type in square brackets. For example, [String] means a list of strings.

intermediate

What does [Int!]! mean in GraphQL?

It means a non-null list of non-null integers. The list itself cannot be null, and none of the integers inside can be null.

beginner

Can a List type contain different types of values in GraphQL?

No, a List type must contain values of the same specified type. For example, [String] can only contain strings.

beginner

Why use List types in GraphQL queries?

List types let you fetch multiple related items in one query, like a list of users or posts, making data fetching efficient and organized.

How do you represent a list of strings in GraphQL schema?

A [String]

B String[]

C List<String>

D {String}

In GraphQL, list types are represented by square brackets around the type, like [String].

What does the exclamation mark (!) mean in GraphQL types?

A The value is a list

B The value is optional

C The value cannot be null

D The value is a string

An exclamation mark means the value cannot be null, ensuring it must always have a value.

Which of these is a valid GraphQL list type for non-null integers?

A [Int!]

B [Int]

C Int!

D Int[]

[Int!] means a list of integers where each integer cannot be null.

Can a GraphQL list contain different types like [String, Int]?

A Yes, lists can mix types

B No, lists must have one type only

C Only if wrapped in a union type

D Only if marked nullable

GraphQL lists must contain values of the same type; mixing types is not allowed.

What is the benefit of using list types in GraphQL queries?

A To limit query depth

B To make queries faster by skipping data

C To avoid using variables

D To fetch multiple items in one query

List types allow fetching multiple related items in a single query, improving efficiency.

Explain how to define and use List types in GraphQL schemas.

Think about how you would describe an array of items in GraphQL.

Describe the importance of List types when querying data in GraphQL.

Consider why you might want to get many records instead of just one.