CJ42

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "./Timers.sol";

contract TimeWatch {

    Timers.Timestamp timer;
    
    function startTimer(uint64 _deadline) public {

CJ42

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "./Timers.sol";

contract RaceTournament {

    mapping(address => Timers.Timestamp) racers;
    
    function startRacerTimer(address _racer, uint64 _deadline) public {

CJ42

Examples of ERC725Y JSON Schemas to describe ERC725Y data keys for LUKSO Buidl Hackathon workshop

{
    "name": "MyProfile",
    "key": "0xd7a3703d6cb893710a4b495319d35de0b7efc070bc705c285266f6c06725ccf2",
    "keyType": "Singleton",
    "valueType": "string",
    "valueContent": "URL"
},

CJ42

pragma solidity ^0.8.0;

contract Voting {

    uint256 votesCount;

    struct Vote {
        bool hasVoted;
        string vote;
    }

CJ42

pragma solidity ^0.8.0;

contract TestingMsize {

    function test() 
        public 
        pure 
        returns (
            uint256 freeMemBefore, 
            uint256 freeMemAfter, 

CJ42

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

contract Source {
    Target target;

    constructor(Target _target) {
        target = _target;
    }

CJ42

; ...
057 SLOAD ; load the value for `target` state variable from storage
; ...
; more stack manipulation
; ...
; ...
; ...
; ...
; ...
; ...

CJ42

/**
 * This script removes source + AST entries inside the JSON artifacts generated by `truffle conpile`
 * It will make artifacts files smaller in size (truffle generated ABI files usually
 * contain around 5,000 to 20,000 lines).
 *
 * It is useful when deploying to a package registry like npm, as it helps to:
 *  - optimize package size
 *  - generate safer to use artifacts, as some artifact files contain sensitive informations
 *      (they key "sourcePath" in the artifacts generated by truffle contains the File system path
 *      of the user that compiled the contracts via `truffle compile` command)

CJ42

pragma solidity ^0.8.0;

contract AllAboutCalldata {

    function manipulateMemory(string memory input) public pure returns (string memory) {
        // you CAN  modify arguments passed with data location 'memory'

        // you can add data in the string
        input = string.concat(input, " - All About Solidity");

CJ42

// We require the Hardhat Runtime Environment explicitly here. This is optional
// but useful for running the script in a standalone fashion through `node <script>`.
//
// When running the script with `npx hardhat run <script>` you'll find the Hardhat
// Runtime Environment's members available in the global scope.
const hre = require("hardhat");
const SampleProfile = require("./SampleProfile.json");

async function main() {
  // Hardhat always runs the compile task when running scripts with its command