alexroan

pragma solidity >=0.5.0;

contract AccessModifiers {
    // Public modifer exposes a getter for state variable
    string public myString;
    // Private variable only accessible within contract
    string private myPrivateString;

    // Internal functions can only be used within this contract
    function innerFunction() internal {}

alexroan

pragma solidity >=0.5.0;

contract RequireStatements {

    function someFunction(address _anAddress) external {
        // Require that the address given as a parameter is not equal to an empty addess.
        // If the address is empty, the whole transaction will not be completed and will be reverted
        require(_anAddress != address(0), "Not a valid address");
        ...
    }

alexroan

pragma solidity >=0.5.0;

contract CustomModifiers {

    // State variable
    address private owner;

	// Custom modifier requiring that the sender of the transaction is the owner
	// otherwise revert the transaction
    modifier onlyOwner {

alexroan

pragma solidity >=0.5.0;

contract Mappings {

    // State variable
    mapping(address => uint) public myMapping;

    // Store a new value in the mapping
    function putThing(address _key, uint _value) public {
        myMapping[_key] = _value;

alexroan

pragma solidity >=0.5.0;

contract Structs {
    
	// Define the Person struct
	struct Person {
		string name;
		uint8 age;
	}

alexroan

pragma solidity >=0.5.0;

contract Vehicle {

}

contract Car is Vehicle {

}

alexroan

pragma solidity ^0.5.5;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract Ethermon is ERC721 {
    
}

alexroan

const Ethermon = artifacts.require("Ethermon");

module.exports = function(deployer) {
	deployer.deploy(Ethermon);
};

alexroan

pragma solidity ^0.5.5;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract Ethermon is ERC721 {

    struct Monster {
        string name;
        uint level;
    }

alexroan

pragma solidity ^0.5.5;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract Ethermon is ERC721 {

    struct Monster {
        string name;
        uint level;
    }