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.

---

addyosmani

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

jsturgis

var mediaJSON = { "categories" : [ { "name" : "Movies",
        "videos" : [ 
		    { "description" : "Big Buck Bunny tells the story of a giant rabbit with a heart bigger than himself. When one sunny day three rodents rudely harass him, something snaps... and the rabbit ain't no bunny anymore! In the typical cartoon tradition he prepares the nasty rodents a comical revenge.\n\nLicensed under the Creative Commons Attribution license\nhttp://www.bigbuckbunny.org",
              "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" ],
              "subtitle" : "By Blender Foundation",
              "thumb" : "images/BigBuckBunny.jpg",
              "title" : "Big Buck Bunny"
            },
            { "description" : "The first Blender Open Movie from 2006",
              "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4" ],

protrolium

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

Arachnid

/**
 * Base contract that all upgradeable contracts should use.
 * 
 * Contracts implementing this interface are all called using delegatecall from
 * a dispatcher. As a result, the _sizes and _dest variables are shared with the
 * dispatcher contract, which allows the called contract to update these at will.
 * 
 * _sizes is a map of function signatures to return value sizes. Due to EVM
 * limitations, these need to be populated by the target contract, so the
 * dispatcher knows how many bytes of data to return from called functions.

noelboss

Simple automated GIT Deployment using GIT Hooks

Here are the simple steps needed to create a deployment from your local GIT repository to a server based on this in-depth tutorial.

How it works

You are developing in a working-copy on your local machine, lets say on the master branch. Most of the time, people would push code to a remote server like github.com or gitlab.com and pull or export it to a production server. Or you use a service like deepl.io to act upon a Web-Hook that's triggered that service.

Arachnid

Excerpt from For The Win, by Cory Doctorow

Once, when he'd been working on his Masters, he'd participated in a study for a pal in the economics department. They'd locked twenty five grad students into a room and given each of them a poker chip. "You can do whatever you want with those chips," the experimenter had said. "But you might want to hang onto them. Every hour, on the hour, I'm going to unlock this door and give you twenty dollars for each poker chip you're holding. I'll do this eight times, for the next eight hours. Then I'll unlock the door for a final time and you can go home and your poker chips will be worthless -- though you'll be able to keep all the money you've acquired over the course of the experiment."

He'd snorted and rolled his eyes at the other grad students, who were mostly doing the same. It was going to be a loooong eight hours. After all, everyone knew what the value of the poker chips were: $160 in the first hour, $140 in the next, $120 in th

shayanb

// This is a simple NodeJS app to display triggered events on a smart contract
// you need your contract ABI and deployed address and also a synced geth running
// github.com/shayanb

var optionsABI = [YOUR_CONTRACT_ABI]
var contractAddress = "0xYOUR_CONTRACT_ADDRESS"



var Web3 = require('web3');

fabdarice

contract Donation {
  mapping (address => uint) user_amounts;    
  
  
  /* DOES THIS METHODS MODIFY user_amounts of the Relay contract ??? */
  function sendDonation(uint n) {
    user_amounts[msg.sender] = user_amounts[msg.sender] + n
  }
}

fabdarice

1) go to https://ropsten.etherscan.io/verifyContract?a=0xa32b21ba14fd476757e392db5d1bbc833eaedaf5
2) enter contract address, name, compiler
3) copy code of contract flatten out (delete import and replace by actual code)
4) truffle console
5) var Eth = require('ethjs')
6) Eth.abi.encodeParams(["uint256", "uint256", "uint256", "address", "uint256"], ["1508105298", "1508710098", "200", "0x3d208fabaf7e919985d5d2f068f28d6a9022e8d5", "5000000000000000000000000000"])
7) copy paste result of encodeParams without '0x'