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Hosted Main Chain Explorers:
https://ethtools.com/mainnet/chain
Can explore:

Contract Addresses
Non Contract Addresses
Transactions (and their internal steps)
Blocks
Contract Code
https://www.etherchain.org

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      it("testing data payload", async () => {
    const address = inbox.options.address;
    const abi = interface;

    // ganache account 0
    const account = "0x962E563Fed877b31fd5108bC27E330354fE8D3a4";

    const privateKey = Buffer.from(
      "3e7966932fba69ea323e8c9223ebecbc2ff06c6d46216577e3c853372d56b5e3",

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Instalar winrar 64 bits de preferencia Serve para descompactar ficheiros .rar .zip https://www.win-rar.com/predownload.html?&L=0 basta dar click no botão direito do rato e ir as opçoes ...

Notas:

• Para cada um dos seguintes passos de instalação exemplo office, desinstalar o atual e reiniciar e instalar o pirata. quando se instala algo pirata desconecta-se da internet durante o processo de instalação.
• Deixar o antivirus para o fim.

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Rails Migration

http://guides.rubyonrails.org/migrations.html

Migrations methods:

• add_column
• add_index
• change_column
• change_table
• create_table
• drop_table

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# Rails Migration
http://guides.rubyonrails.org/migrations.html

## Migrations methods:
* add_column
* add_index
* change_column
* change_table
* create_table
* drop_table

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version: '2'

services:
  db: 
    image: postgres
    restart: always
    environment:
      POSTGRES_PASSWORD: postgres
    networks:
      - postgres

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/// PROMISE EX: 
function examplePromise() {
   return new Promise(function(resolve, err) { 
       setTimeout(resolve('Hello promise'), 100)
   });
}


examplePromise()
    .then( (res) => console.info('res', res))

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##what are generators##

• They're pausable functions, pausable iterable functions, to be more precise
• They're defined with the *
• every time you yield a value, the function pauses until .next(modifiedYieldValue) is called

var myGen = function*() {
  var one = yield 1;
  var two = yield 2;
  var three = yield 3;
 console.log(one, two, three);

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var fs = require('fs');

var walkPath = './';

var walk = function (dir, done) {
    fs.readdir(dir, function (error, list) {
        if (error) {
            return done(error);
        }