Ethereum Cookbook

Structs 

Structs provide a way to define new types of solidity:

1. Use the struct keyword for creating user-defined types in solidity:

struct Person { }

2. Create a struct with a name and the associated properties inside it:

struct Person {    uint16 id;    bytes32 fName;    bytes32 lName;}

3. Structs can also include arrays, mapping, or other user-defined types:

struct Person {    uint16 id;    bytes32 fName;    bytes32 lName;    Contact phone;}struct Contact {    uint countryCode;    uint number;}

4. You cannot create a struct member with its own type. This helps in limiting the size of the struct to a finite value.

5. Create a variable of the struct type as follows:

Person owner;Person[] contributors;

6. Directly access or modify the values of a struct as follows:

contributors[2].fName ...