| // SPDX-License-Identifier: MIT | |
| pragma solidity 0.8.11; | |
| contract MappingBool { | |
| // NB: if you need to distinguish from nil vs false this method does not work | |
| mapping(address => bool) entries; | |
| // gas 44463 |
The block in Ethereum is the collection of relevant pieces of information (known as the block header), together with information corresponding to the comprised transactions, and a set of other block headers that are known to have a parent equal to the present block’s parent’s parent (such blocks are known as uncles).
type Block struct {
header *Header
uncles []*Header
| // paste this in your browser's console | |
| (function() { | |
| _loadScript = function(path){ var script= document.createElement('script'); script.type= 'text/javascript'; script.src= path; document.head.appendChild(script); } | |
| _loadScript('https://cdn.jsdelivr.net/npm/ethers@5.5.0/dist/ethers.umd.js'); | |
| // @TODO: this can fail on slow connections; should have a retry mechanism | |
| setTimeout(() => { | |
| console.log(`Loaded ethersjs version: ${ethers.version}`); | |
| }, 1500); |
| // paste this in your browser's console | |
| (function() { | |
| _loadScript = function(path){ var script= document.createElement('script'); script.type= 'text/javascript'; script.src= path; document.head.appendChild(script); } | |
| _loadScript('https://cdnjs.cloudflare.com/ajax/libs/web3/1.6.1-rc.0/web3.min.js'); | |
| // @TODO: this can fail on slow connections; should have a retry mechanism | |
| setTimeout(() => { | |
| console.log(`Loaded Web3 version: ${Web3.version}`); | |
| }, 1500); |
| describe("Understand Jest framework", () => { | |
| test("async works with Promise.resolve", async () => Promise.resolve(true)) | |
| test("async works with return", async () => true) | |
| test("async works with expect met", async () => expect(true).toBe(true)) | |
| test("expect throws", async () => { | |
| try { | |
| expect(true).toBe(false) | |
| console.log('This should not be printed') | |
| } catch (err) { | |
| // silence the error |
| 0x518d4640876362611fd93a177bf5f2a7b01f873c |
| # PWN that sucker! | |
| # Warning: completely obliterates Docker: removes all containers, images and volumes | |
| # add this function to your ~/.bash_profile or ~/.zshrc (or equivalent) | |
| pwndocker() { | |
| echo -n "You sure you want to pwn Docker (y/n)? " | |
| read answer | |
| if echo "$answer" | grep -iq "^y$" ;then | |
| [[ -n $(docker ps -qa) ]] && docker kill $(docker ps -qa) | |
| [[ -n $(docker ps -qa) ]] && docker rm -v $(docker ps -qa) | |
| [[ -n $(docker images -q) ]] && docker rmi -f $(docker images -q) |
| CREATE TABLE `datapoints` ( | |
| `id` int(11) unsigned NOT NULL AUTO_INCREMENT, | |
| `lineid` varchar(255) DEFAULT NULL, | |
| `geolocation` point DEFAULT NULL, | |
| `price` float NOT NULL, | |
| `currency` varchar(20) NOT NULL DEFAULT '', | |
| `locname` text DEFAULT NULL, | |
| `time` datetime DEFAULT NULL, | |
| PRIMARY KEY (`id`) | |
| ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8; |
| const Promise = require('bluebird'); | |
| // bluebird unhandledRejection event | |
| process.on('unhandledRejection', function (reason, promise) { | |
| console.log(`unhandledRejection, reason ${reason}`, promise); | |
| // don't continue in this state you plonker! | |
| process.exit(1); | |
| }); | |
I've been asked a few times over the last few months to put together a full write-up of the Git workflow we use at RichRelevance (and at Precog before), since I have referenced it in passing quite a few times in tweets and in person. The workflow is appreciably different from GitFlow and its derivatives, and thus it brings with it a different set of tradeoffs and optimizations. To that end, it would probably be helpful to go over exactly what workflow benefits I find to be beneficial or even necessary.