Create account

DEV Community

Vedant Chainani

Posted on Jun 9, 2022 • Edited on Jul 21, 2022

Day 12 - Enums

#100daysofcode #solidity #web3 #blockchain

envoy1084 / 30-Days-of-Solidity

30 Days of Solidity step-by-step guide to learn Smart Contract Development.

WARNING: This repository is currently undergoing updates and revisions to incorporate the latest information and advancements in Solidity programming. Please be advised that the content may not be up-to-date or accurate during this time. We expect the updates to be completed within the next 30 days, and appreciate your patience during this process. Thank you for your understanding.

View on GitHub

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.