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JavaScript Asynchronous Execution Concepts: Callbacks vs Promises - Concepts and History

Dated 10/15/2016

Please read these excellent articles/threads online (presented in order I feel is best for basic understanding) After reading the excertps presented here; please flow the links and read them, esp the comments on each QnA on SO (stackOverflow)

Sync vs Async

http://stackoverflow.com/questions/748175/asynchronous-vs-synchronous-execution-what-does-it-really-mean

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//Jasmine test // AUT = app under test // HCS = some resouce to be created multiple times to test pagination
// defaultData has 11 defaultHCSID in array

describe ("Test: Create 11 HCSes to test pagination", function () {
    beforeAll(function (done) {
        AUT.api.defaultHCS.create(defaultData).then(()=> {
            done(); 
            //setTimeout(function () {done();}, AUT.API_TIMEOUT);
        });
    });

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Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

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Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Introduce Gizzard of Twitter - 트위터의 새로운 분산 관리 라이브러리 Gizzard를 소개합니다.
• The Architecture Twitter Uses to Deal with 150M Active Users, 300K QPS, a 22 MB/S Firehose, and Send Tweets in Under 5 Seconds
• Scaling Twitter: Making Twitter 10000 Percent Faster

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

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Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger

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

STEP 1 create new project (creates scaffolding)

$ rails new JMDMega

$ bin/rails server--> Check localhost:3000 -> Stop ctrl +C

STEP 2 create a controller, an action, a view, 2 routes,

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Amazon ec2 LAMP and FTP installation and setup

Tutorial: Installing a LAMP Web Server on Amazon Linux

Go through this amazon link http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/install-LAMP.html

Associate and Elastic IP address to your EC2 instance.

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Crisp-DM on AWS

Six phase of DM

Phase 1: Business Understanding

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function executeReferencedRequest({ collectionUUID, requestName }, callback) {
  var _ = require('lodash');
  
  //Please refer Postman docs on how to generate an API KEY https://go.pstmn.io/docs-pro-api-intro
  const API_KEY = "<API-KEY>";

  /*
   Here we are making an API call to Postman (Refer: https://api.getpostman.com) using pm.sendRequest from the script,
   to fetch the collection from which we need to reuse the request.
  */