shuklaneerajdev

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

shuklaneerajdev

apiVersion: v1
kind: ConfigMap
metadata:
  name: example
  namespace: default
data:
  APPLICATION_HOST: example.com
  LANG: en_US.UTF-8
  PIDFILE: /tmp/server.pid
  PORT: "3000"

shuklaneerajdev

$map = Hash.new

def fibonacci(n)
  if $map.key?(n)
    return $map[n]
  end
  if n==1 || n==0
    return 1
  else
    val = fibonacci(n-1)+fibonacci(n-2)

shuklaneerajdev

def reverse(input)
  rev = ""
  i = input.length-1
  while i>=0 do
    rev = rev+input[i]
    i=i-1
  end
  puts rev
end

shuklaneerajdev

require "stripe"
Stripe.api_key = "YOUR_API_KEY"
def grab_and_process_charges(list_of_charges)
  # complete the task that you need to do with your list of charges
  list_of_charges.each do |charge|
    puts "charge id is #{charge['id']} and the amount is #{charge['amount']} in currency #{charge['currency']}"
  end
end

list_of_charges = Stripe::Charge.list(limit: 10)

shuklaneerajdev

<video id="into-video" class="video-js vjs-default-skin" autoplay controls preload="auto" width="640"
  poster="https://mycdn.cloudfront.net/myposter.png">
   <source src="https://mycdn.cloudfront.net/video.webm" type='video/webm' />
   <source src="https://mycdn.cloudfront.net/video.mp4" type='video/mp4' />
   <p class="vjs-no-js">To view this video please enable JavaScript, or consider upgrading your browser.</p>
</video>

shuklaneerajdev

INSTALL JAVA
$ sudo apt-get update && sudo apt-get install default-jre

INSTALL ELASTIC SEARCH https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-repositories.html
$ wget -qO - https://packages.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
$ echo "deb https://packages.elastic.co/elasticsearch/2.x/debian stable main" | sudo tee -a /etc/apt/sources.list.d/elasticsearch-2.x.list
$ sudo apt-get update && sudo apt-get install elasticsearch
$ sudo update-rc.d elasticsearch defaults 95 10
$ sudo service elasticsearch restart
$ sudo service elasticsearch status

shuklaneerajdev

upstream myapp_puma {
  server unix:/tmp/myapp_puma.sock fail_timeout=0;
}

# for redirecting to https version of the site
server {
       listen 80;
       rewrite ^(.*) https://$host$1 permanent;
 }
 

shuklaneerajdev

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.18'
gem 'sidekiq'
gem 'detect_timezone_rails'
# Use Puma as the app server

shuklaneerajdev

def flatten(input)
  result = Array.new
  input.each do |element|
    if element && element.instance_of?(Array)
      # if the current element is an array then recursively flatten that
      # array and add that array to the result
      result = result+flatten(element)
    else
      # else this is just a regular element and add the element to result
      result << element