Structs

So far, we’re only using built-in Solidity types in our smart contracts. But with Solidity, we can also define composite types containing multiple fields in one variable. To do this, we need to use structs, a feature we'll learn about in this lesson.

We'll first see how we can define and use structs. Then, we'll add a feature to our smart contract that will allow us to track who owns each name in our registry. An owner of a name will then have some extra privileges that we'll implement later in this lesson.

Structs in Solidity

Structs in Solidity allow for the creation of a new type that packs together multiple fields in one variable. It's somewhat similar to classes in other programming languages, but structs in Solidity don't have methods and don’t support inheritance.