FrankV01

I intend to convert this to Markdown.

# --------------------------------------------------------------------------
# docker compose up -d  #Create & Start the stack and detach
# docker compose up --force-recreate --build -d #Create & Start the stack and detach
# docker compose down   #Stop and **Destroy** the stack (Does NOT remove the volume)
# docker compose down -v #Stop and **Destroy** the stack and **REMOVE** the volume
#
# docker compose stop  #Stop the stack. Does not destroy it.
# docker compose start # [re]start the stack.

FrankV01

# Last updated: 08/24/2916
#
# Total instructions available: 18
#
# https://docs.docker.com/engine/reference/builder/
#
# You can use a .dockerignore file in the same context directory as
# your Dockerfile to ignore files in the context before sending them
# to the Docker daemon for building to speed up building.

FrankV01

Exercise 1

Revised Answer The correct SQL came to me last night. Here's my revised SQL. I left my original answer for completeness and disclosure (though you could see it from the history of the gist).

SELECT
     p.PersonId, p.NameFirst, p.NameLast,
     (select top 1 OrderId from Order o where o.PersonId=p.PersonId Order by OrderDateTime DESC) as LastOrderId,
     (select max(OrderDateTime) from Order o where o.PersonId=p.PersonId) as LastOrderDateTime
FROM Person p
ORDER BY p.PersonId DESC

FrankV01

//Sourced from https://github.com/TheOpenSourceU/pinkie/blob/tOSU/article/index.js#L170
function Promise(resolver) {
  if (typeof resolver !== 'function') {
    throw new TypeError('Promise resolver ' + resolver + ' is not a function');
  }

  if (this instanceof Promise === false) {
    throw new TypeError('Failed to construct \'Promise\': Please use the \'new\' operator, this object constructor cannot be called as a function.');
  }

FrankV01

//
// require statements omitted for readability and brevity.
var readFile = Promise.promisify(require("fs").readFile); //See http://bluebirdjs.com/docs/api/promise.promisify.html

function processData( startData ) {
  //Return a promise which impl will use "then" to implement what was "cbResult"
  return new Promise( function(resolve) {
    //
    // Do something with startingData and ultimatly set result to finalizedResult.
    // ...

FrankV01

client.query('SELECT NOW() as now', (err, res) => {
  if (err) {
    console.log(err.stack)
  } else {
    const targetDate = res.rows[0];
    client.query(`SELECT * from myTable where lastCreated > ${res.rows[0]}`, (er2, res2) => {
      //This, in theory could go on a bit. Note that this is a contrived example and in the case
      // of SQL, you'd use the proper joins and conditionals in one statement. 
    })
  }

FrankV01

// require statements omitted for readability and brevity.
function processData( startingData, cbResult ) {
  //
  // Do something with startingData and ultimatly set result to finalizedResult.
  // ...
  var finalizedResult = startingData;
  cbResult(finalizedResult);
} 

function parentMethod() {

FrankV01

findSomething(function(error, something) {  //callback 1
  if (error) {
    throw new Error(error) 
  }
  transformSomething(something, function(error, transformed) { //callback 2
    if (error) {
      throw new Error(error) 
    }
    validateTransformed(transformed, function(error, validated) {  //callback 3
      if (error) {