Duane Scarlett duanescarlett

I have a deep passion for all things related to Information Technology. I am a Full-Stack Software Engineer.

duanescarlett / Transaction.sol

Created December 28, 2023 02:24

This is for a solidity tutorial that explains the use of the tx object and gas in solidity

	// SPDX-License-Identifier: MIT

	pragma solidity 0.8.23;

	contract TransactionInfo {

	// State variable to store contract balance
	uint256 public contractBalance;

	// Variables to store transaction details

duanescarlett / MsgObject.sol

Created December 16, 2023 03:06

This is for the tutorial that teaches about the MSG object

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

	contract TransactionInfo {
	address public owner;
	uint256 public contractBalance;

	constructor() {
	// Set the owner to the account that deploys the contract
	owner = msg.sender;

duanescarlett / inheritance.sol

Created March 31, 2023 01:56

Tutorial on inheritance

	// SPDX-License-Identifier: GPL-3.0
	pragma solidity ^0.8.17;

	contract Parent {
	function foo() public pure virtual returns (string memory) {
	return "A";
	}

	function bar() public pure virtual returns (string memory) {
	return "B";

duanescarlett / SafeMath.sol

Last active March 10, 2023 18:25

In this tutorial I explain how overflow and unchecked works in solidity

duanescarlett / visibility.sol

Created March 5, 2023 17:03

A smart contract that describes visibility

	// SPDX-License-Identifier: GPL-3.0
	pragma solidity ^0.8.17;

	contract Visibility {
	uint256 private x = 0;
	uint256 internal y = 1;
	uint256 public z = 2;

	// Public
	// Accesed from any smart contract, function inside

duanescarlett / DataTypesTutorial.sol

Created February 28, 2023 01:14

This is for a tutorial that teaches datatypes

	// SPDX-License-Identifier: GPL-3.0
	pragma solidity ^0.8.17;

	contract VariablesAndDataTypes {
	// State Variables
	int256 public oneIng = 1;
	uint256 public oneUint = 1;

	// Local Variable
	function getValue() public pure returns(uint256) {

duanescarlett / main.js

Last active June 16, 2022 15:36

Get Liquidity Pool address

	const ethers = require('ethers')
	const { toChecksumAddress } = require('ethereum-checksum-address')
	require('dotenv').config()

	const main = async () => {
	// Connect to an EVM network
	const provider = new ethers.providers.JsonRpcProvider(`https://rpc.ankr.com/bsc`)

	// Create a Factory contract abi
	const IPair = [

duanescarlett / main.js

Last active January 5, 2023 23:49

Send ERC-20 tokens to another wallet

	const ethers = require('ethers')
	const { toChecksumAddress } = require('ethereum-checksum-address')
	require('dotenv').config()

	const main = async () => {
	// Connect to an EVM network
	const provider = new ethers.providers.JsonRpcProvider(`https://polygon-mainnet.g.alchemy.com/v2/${process.env.RPC_KEY}`)
	// Create a wallet
	const wallet = new ethers.Wallet(process.env.PRIVATE_KEY)
	// Get a signer

duanescarlett / main.js

Created March 31, 2022 15:13

This converts from decimal to wei then from wei to decimal

	const Web3 = require('web3')
	require('dotenv').config()

	const main = async () => {
	// Connect to a EVM blockchain
	const web3 = new Web3(Web3.givenProvider \|\| process.env.INFURA_URL)

	// Convert from a decimal number to a wei number
	let amt = web3.utils.toWei('0.1', 'ether')
	console.log('Convert from a decimal number to a wei number', amt)

duanescarlett / main.js

Created March 21, 2022 16:42

Get ether and erc-20 token balances in a wallet

	const ethers = require('ethers')
	const { toChecksumAddress } = require('ethereum-checksum-address')
	require('dotenv').config()

	const main = async () => {
	// Connect to an EVM network
	const provider = new ethers.providers.JsonRpcProvider(`https://polygon-mainnet.g.alchemy.com/v2/${process.env.RPC_KEY}`)
	// Create a wallet
	const wallet = new ethers.Wallet(process.env.PRIVATE_KEY)
	// Get a signer