Structs in Blockchain / Solidity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a struct in blockchain programming?

A struct is a way to group related data together into one unit, like putting different pieces of information about a person into one folder.

beginner

How do you define a struct in Solidity?

You use the struct keyword followed by the struct name and curly braces containing the variables, for example:<br>struct Person { string name; uint age; }

intermediate

Can structs contain other structs inside them?

Yes, structs can have other structs as members, allowing you to build complex data models by nesting structs.

beginner

How do you create and use a struct variable in Solidity?

You declare a variable of the struct type and assign values to its fields, like:<br>Person memory p = Person("Alice", 30);

beginner

Why are structs useful in blockchain smart contracts?

Structs help organize data clearly and efficiently, making contracts easier to read and manage, especially when handling complex information.

What keyword is used to define a struct in Solidity?

A struct

B class

C object

D record

The keyword struct is used to define a struct in Solidity.

Which of these can a struct contain?

A Other structs

B Only simple data types like uint and string

C Functions

D Events

Structs can contain other structs as members, allowing nested data structures.

How do you create a struct variable in Solidity?

A By calling a constructor function

B By importing from another contract

C By declaring a variable of the struct type and assigning values

D By using the new keyword

You declare a variable of the struct type and assign values directly.

Why use structs in smart contracts?

A To speed up contract execution

B To organize related data together

C To create user interfaces

D To store contract code

Structs organize related data clearly and efficiently.

Which of these is NOT a valid member type inside a struct?

A uint

B string

C address

D mapping

Mappings cannot be members of structs in Solidity.

Explain what a struct is and why it is useful in blockchain smart contracts.

Think about how you keep related information together in real life.

Describe how to define and use a struct in Solidity with an example.

Imagine creating a new type to hold multiple pieces of information.