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Generators are function execution contexts that can be paused and resumed.

A Generator function will yield a value then stop but the function context of a Generator is not disposed of (as it is with normal functions). You can re-enter the Generator at a later point in time and pick up further results

function* threeThings() {
    yield 'one';
    yield 'two';
    yield 'three';
}

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# copyng files from an outside box to you directory
scp -i infolob-analytics.pem ubuntu@54.147.173.72:/home/ubuntu/.pm2/logs/index-out-0.log .


# running image, configuring port, environment var 
docker run --name some-postgres -p 5432:5432 -e POSTGRES_PASSWORD=visualuser -e POSTGRES_USER=visualuser -d postgres

# running a continaer and attaching it
docker run -i -t centos

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brew tap caskroom/cask Now, you can install PowerShell:

brew cask install powershell Finally, verify that your install is working properly:

pwsh When new versions of PowerShell are released, simply update Homebrew's formulae and upgrade PowerShell:

brew update

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Install iTerm2 with Solarized in 2017

Here is the looks and feel of your terminal once the tutorial has been applied on your system:

Install iTerm2

Using Homebrew:

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Copy an object but reseting its values

function skeleton(source, isArray) {
   var o = Array.isArray(source) ? [] : {};
   for (var key in source) {
      if (source.hasOwnProperty(key)) {
         var t = typeof source[key];
 o[key] = t == 'object' ? 

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Terraform state using a remote storage

In order to have the state of you terraform in a remote place let say at AWS S3 you need to :

• You need to create the bucket at AWS S3 using terraform
• you need to add backend to indicate that you will use the bucket created to store the terraform state (encryting it)

provider "aws" {

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function isPrime(value) {
   // creates the cache
   if(!isPrime.answeres) {
      isPrime.answers = {};
   }
   
   // checks for cached values
 if (isPrime.answers[value] !== undefined) {

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var store = {
  nextId: 1,
  cache: {},
  add: function(fn) {
     if (!fn.id) {
        fn.id = this.nextId++;
        this.cache[fn.id] = fn;
        return true;
 }

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Links to intiated me in the road to design Scalable and Distributed Systems.

General ideas to architect a web application and how to scalate it.
http://www.aosabook.org/en/distsys.html# 

How to did Flickr to solve its scalability issues. 
https://www.scribd.com/doc/2592098/DVPmysqlucFederation-at-Flickr-Doing-Billions-of-Queries-Per-Day


Memcache at Facebook

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TLS Socket: server and client The only major differences between this and a regular TCP connection are the private Key and the public certificate that you’ll have to set into an option object. How to Create a Key and Certificate The first step in this security process is the creation of a private Key. And what is this private key? Basically, it's a set of random noise that's used to encrypt information. In theory, you could create one key, and use it to encrypt whatever you want. But it is best practice to have different keys for specific things. Because if someone steals your private key, it's similar to having someone steal your house keys. Imagine if you used the same key to lock your car, garage, office, etc.

openssl genrsa -out private-key.pem 1024

Once we have our private key, we can create a CSR (certificate signing request), which is our request to have the private key signed by a fancy authority. That is why you have to input information related to your company. This information will be seen by the