Structs in Solidity allows you to create more complicated data types that have multiple properties. You can define your own type by creating a struct.
They are useful for grouping together related data.
Structs can be declared outside of a contract and imported in another contract. Generally, it is used to represent a record. To define a structure struct keyword is used, which creates a new data type.
Syntax:
struct <structure_name> {
<data type> variable_1;
<data type> variable_2;
}Example:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
contract structType {
struct Student {
string name;
string gender;
uint roll_no;
}
// Declaring a structure object
Student student1;
// Assigning values to the fields for the structure object student2
Student student2 = Student("Jeff","Male",1);
// Defining a function to set values for the fields for structure
// student1
function setStudentDetails() public {
student1 = Student("Teresa","Female",2);
}
// Defining a function to get Student Details
function studentInfo() public view returns (string memory, string memory, uint) {
return(student1.name , student1.gender , student1.roll_no);
}
}Output -
When we run setStudentDetails it stores values in the structure student2
and when we call the studentInfo function we get
{
"0": "string: Teresa",
"1": "string: Female",
"2": "uint256: 2"
}