nakajo2011

import React from 'react';
import './App.css';
import './ExchangeRates'
import ExchangeRates from "./ExchangeRates";


export default function App() {
  return (
    <div>
      <h2>My first Apollo app 🚀</h2>

nakajo2011

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';
import fetch from 'cross-fetch';
import { gql, ApolloProvider, ApolloClient, HttpLink, InMemoryCache } from '@apollo/client';

const endpoint = 'https://48p1r2roz4.sse.codesandbox.io' // apolloのGetting Started

nakajo2011

import {gql, useQuery} from '@apollo/client';

const EXCHANGE_RATES = gql`
  query GetExchangeRates {
    rates(currency: "USD") {
      currency
      rate
    }
  }
`;

nakajo2011

import fetch from 'cross-fetch';
import { gql, ApolloClient, HttpLink, InMemoryCache } from '@apollo/client';
const client = new ApolloClient({
  link: new HttpLink({ uri: 'https://48p1r2roz4.sse.codesandbox.io', fetch }),
  cache: new InMemoryCache()
});
client
  .query({
    query: gql`
      query GetRates {

nakajo2011

pragma solidity ^0.8.1;


contract ModExpContracts {
    address public constant modExpAddress = 0x0000000000000000000000000000000000000005;
    
    bytes public _result;
    
    function modExp(
        uint baseLength,

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