Smart contracts examples

Intro

Default ERC-20 example following OpenZeppelin

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "@openzeppelin/contracts@4.9.5/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts@4.9.5/token/ERC20/extensions/ERC20Permit.sol";

contract MyToken is ERC20, ERC20Permit {
    constructor() ERC20("MyToken", "MTK") ERC20Permit("MyToken") {}
}

Getter/Setter contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Greeter {
    
    string greeting;

    constructor(string memory _greeting) {
        greeting = _greeting;
    }

    function setGreeting(string memory _greeting) public {
        greeting = _greeting;
    }

    function greet() public view returns (string memory) {
        return greeting;
    }
}