nakajo2011

pragma solidity >= 0.8.0;


contract CalledContract {    
    uint[] nums;
    
    function onlyEven(uint256 a) external pure returns(uint) {
        uint b = 300 / a;
        require(b % 2 == 0, "Ups! Reverting");
        return b;

nakajo2011

const pify = require('pify')

async function queueTransaction(from, to, value, nonce, gasLimit, data) {
    const response = await pify(web3.currentProvider.send)({
        jsonrpc: "2.0",
        method: "eth_sendTransaction",
        id: new Date().getTime(),
        params: [
          {
            from: from,

nakajo2011

it('multi transfer in same block', async () => {
  web3.extend({property: 'mine', methods: [{ name: 'start', call: 'miner_start', params:0}]})
  web3.extend({property: 'mine', methods: [{ name: 'stop', call: 'miner_stop', params:0}]})

  const instance = await MyERC20Token.new()
  const beforeBlock = await web3.eth.getBlockNumber()

  await web3.mine.stop()
  
  // queued tx1

nakajo2011

pragma solidity >=0.6.5;
contract SimpleDonationManager {
    uint256 immutable minDonation = 42;
    uint256 immutable maxDonation = calcMaxDonation();
    address immutable owner;
    constructor() public {
        owner = msg.sender;
        // Error: Immutables cannot be read in constructor.
        // assert(minDonation <= maxDonation);
        // Error: Immutables can only be assigned once.

nakajo2011

/* Mock web3 as __tests__/__mocks__/web3.js */
// const web3 = jest.genMockFromModule('web3')

/* Mock web3-eth-contract */
let mockWeb3EthContract = function() {}
function __setMockContract(mock) {
  mockWeb3EthContract = mock
}

let blockNumber = 0

nakajo2011

const Web3 = require('web3')
const Faucet = require('./faucet')
const BLOCK_NUMBER_PER_DAY = 24 * 60 * 4
const contractJson = require('../../build/contracts/MyToken')

class FaucetWithProvider extends Faucet {
  constructor(provider, address, fromAddress) {
    super(address, fromAddress)
    this.provider = new Web3(provider)
    this.myToken = new this.provider.eth.Contract(contractJson.abi, address, {from: fromAddress})

nakajo2011

const Faucet = require('../src/model/faucet')

const CONTRACT_ADDRESS = '0xadDf5bC8b45571D94e2FD46Bfb81f8dD6D6f9FA0'
const FROM_ADDRESS = '0x259de638f0d6d79dfa084a810c1356d4d575b62e'

describe('Faucet', function () {
  describe('init', function () {
    it('should be return instance', async () => {
      const ins = new Faucet(CONTRACT_ADDRESS, FROM_ADDRESS)
      expect(ins).toBeDefined()

nakajo2011

const Web3 = require('web3')
const BLOCK_NUMBER_PER_DAY = 24 * 60 * 4
const contractJson = require('../../build/contracts/MyToken')

class Faucet {
  constructor(address, fromAddress) {
    this.provider = new Web3(new Web3.providers.HttpProvider("http://localhost:7545"))
    this.myToken = new this.provider.eth.Contract(contractJson.abi, address, {from: fromAddress})
  }

nakajo2011

const BaseTrie = require('merkle-patricia-tree/baseTrie')
const TrieNode = require('merkle-patricia-tree/trieNode')

const toNibbleArray = (bytes) => {
  let nibbles = []
  bytes.forEach((b) => {
    nibbles.push(parseInt(b / 16))
    nibbles.push(b % 16)
  })
  return Buffer.from(nibbles)

nakajo2011

# Devcon 5 Auction
# Masked Reveal Auction

#*******************************

#Every user has a bid amount, hash (bidamount,pass), sent masked amount
struct Data:
    bidval: wei_value
    hashval: bytes32
    sentval: wei_value