Enums in Solidity

Name the phases; walk them in order with a cast.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

// An enum names the phases; the contract walks them in order.
contract SeasonTracker {
    enum Season { Dormant, Blossom, Growing, Harvest }

    Season public season = Season.Dormant;

    function advance() external {
        require(season != Season.Harvest, "season over");
        season = Season(uint8(season) + 1);
    }

    function isPicking() external view returns (bool) {
        return season == Season.Harvest;
    }
}

How it works

enum Season defines four ordered constants.
Season(uint8(season) + 1) steps to the next phase.
require refuses to advance past the last.

Keywords and builtins used here

bool
contract
enum
external
function
public
require
return
returns
uint8

The run, in numbers

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Characters to type: 445
Tokens: 80
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Step 3 of 3 in Storage, step 7 of 28 in Language basics.

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Enums in Solidity

How it works

Keywords and builtins used here

The run, in numbers

Enums in other languages