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Lesson 3:
Constants
Introduction to Solidity constants
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Constants
Constants are variables that cannot be modified. Constants should be named with all capital letters with underscores separating words. Examples: MAX_BLOCKS, TOKEN_NAME, TOKEN_TICKER, CONTRACT_VERSION.
Their value is hard coded and using constants can save gas cost.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
contract Constants {
// coding convention to uppercase constant variables
address public constant MY_ADDRESS = 0x777788889999AaAAbBbbCcccddDdeeeEfFFfCcCc;
uint256 public constant MY_UINT = 123;
}