miohtama

"""A stateful event scanner for Ethereum-based blockchains using web3.py.

With the stateful mechanism, you can do one batch scan or incremental scans,
where events are added where the scanner left last time.

Copyright 2021 Mikko Ohtamaa, https://twitter.com/moo9000, licensed under MIT
"""

import datetime
import time

spalladino

Falsehoods that Ethereum programmers believe

I recently stumbled upon Falsehoods programmers believe about time zones, which got a good laugh out of me. It reminded me of other great lists of falsehoods, such as about names or time, and made me look for an equivalent for Ethereum. Having found none, here is my humble contribution to this set.

About Gas

Calling estimateGas will return the gas required by my transaction

Calling estimateGas will return the gas that your transaction would require if it were mined now. The current state of the chain may be very different to the state in which your tx will get mined. So when your tx i

raineorshine

const Web3 = require('web3')
const Tx = require('ethereumjs-tx').Transaction

// connect to Infura node
const web3 = new Web3(new Web3.providers.HttpProvider('https://mainnet.infura.io/INFURA_KEY'))

// the address that will send the test transaction
const addressFrom = '0x1889EF49cDBaad420EB4D6f04066CA4093088Bbd'
const privateKey = new Buffer('PRIVATE_KEY', 'hex')

alanbsmith

Thin Crust Pizza Recipe

YIELD

This recipe yields 2 14" pizzas 🍕🍕

INGREDIENTS

DOUGH

• 1 packet yeast
• 1 tsp sugar (or honey or whatever)

nonsensery

'use strict'

window.bigHeads = window.bigHeads || (function(window, document){
  var edgePadding = 10

  function makeRect(top, right, bottom, left) {
    return { top, right, bottom, left, width: (right - left), height: (bottom - top) }
  }

  function ftosMaxChars(f, maxChars) {

Restuta

/*  Sometimes it's pretty easy to run ito troubles with React ES6 components.
    Consider the following code: */

class EventStub extends Component {
  componentDidMount() {
    window.addEventListener('resize', this.onResize.bind(this)); //notice .bind
  }
  
  componentWillUnmount() {
    window.removeEventListener('resize', this.onResize.bind(this));

aphillipo

class MainApp extends Component {
    constructor(props) {
        super(props);
    }

    renderScene(route, navigator) {
        var Component = route.component;
        return (
            <Component route={route} navigator={navigator} />
        );

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

rcotrina94

This code how to replace the traditional radio-buttons, for custom images. You can do the same with checkboxes.

• Demo: http://jsfiddle.net/La8wQ/10/
• A mod: http://jsfiddle.net/La8wQ/22/

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')