Day 12 - Enums

This is Day 12 of 30 in Solidity Series
Today I Learned About Enums in Solidity.

Enums are the way of creating user-defined data types, it is usually used to provide names for integral constants which makes the contract better for maintenance and reading.

Enums restrict the variable with one of a few predefined values, these values of the enumerated list are called enums. Options are represented with integer values starting from zero, a default value can also be given for the enum. By using enums it is possible to reduce the bugs in the code.

Syntax

enum <enumerator_name> { element 1, element 2, ...., element n } 

Example:

// SPDX-License-Identifier: MIT  pragma solidity ^0.8.7; contract EnumType { // Creating an enumerator  enum Days { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday } // Declaring variables of type enumerator  Days day; // Setting a default value  Days constant defaultDay = Days.Monday; // Get default Day  function getDefaultDay() public pure returns (Days) { return defaultDay; } // Set day to a object from the enumerator Days  function setDay() public { day = Days.Tuesday; } // get value of day  function getDay() public view returns (Days) { return day; } } 

Output:

When we run the getDefaultDay function, we get the default value of the enumerator.

0:uint8: 0 

When we run the getDay function we get 0:uint8: 0 as we have set it to a default value of Monday.

When we run the setDay function and then run the getDay function we get 0:uint8: 1 as setDay function has set the value of day to Tuesday.