Error Handling in Solidity Smart Contract

This smart contract demonstrates error handling in Solidity using the require(), assert(), and revert() statements. These methods help validate conditions and manage errors effectively during the execution of smart contract functions.

Methods

require()

• Validates conditions before further execution.
• If the condition fails, the execution is terminated, and an optional error message is displayed.
• Syntax: require(condition, message);.

assert()

• Checks conditions and terminates execution if the condition fails.
• Generates an error message if the condition is not met.
• Syntax: assert(condition);.

revert()

• Flags an error and reverts the current call, undoing any changes made to the state.
• An optional error message can be provided.
• Syntax: revert(message);.

Contract Code

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

contract ErrorHandling {
    uint public number;

    function validateRequire(uint inputNum) public pure {
        require(inputNum > 20, "Input must be greater than 20"); // Require statement with a condition and a message
    }

    function validateAssert(uint inputNumber) public view {
        assert(inputNumber == 5); // Assert statement with a condition
    }

    function validateRevert(uint inputNum) public pure {
        if (inputNum <= 20) { // Revert statement with a condition and a message
            revert("Input must be greater than 20");
        }
    }
}