sbpipb

# Concurrency and Parallelism
# https://www.toptal.com/ruby/ruby-concurrency-and-parallelism-a-practical-primer

require 'benchmark'

def fib(n)
  n < 2 ? n : fib(n-1) + fib(n-2)
end  

puts Benchmark.measure { 

sbpipb

Benchmark.ips do |bm|
  bm.report("spy") { spy(User, id: 1) }
  bm.report("double") { double(User, id: 1) }
  bm.report("verifying double") { instance_double(User, id: 1) }
  bm.report("actual object") { User.new(id: 1) }
  bm.report("via factorygirl") { FactoryGirl.build(:user, id: 1) }
  bm.compare!
end

sbpipb

Shows git commits on all your local branches, sorted oldest to newest

git for-each-ref --sort=committerdate refs/remotes/ --format='%(HEAD) %(color:yellow)%(refname:short)%(color:reset) - %(color:red)%(objectname:short)%(color:reset) - %(contents:subject) - %(authorname) (%(color:green)%(committerdate:relative)%(color:reset))'

removing changes from a branch

Git Rebase Onto

git rebase --onto branch_1 old_branch branch_2

sbpipb

// I'll explain it again


```class MyComponent extends React.Component {
  myEvent = () => {
    console.log('do something')
  }

  render () {
    <button onClick={this.myEvent}> WOW </button>

sbpipb

Rails Asset Pipeline
the basics of how to use the asset pipeline
best practices for structuring where to put your assets
how to use the precompile array to specify what files are processed by the asset pipeline
how Sass and Coffeescript can be leveraged
how to use Rails asset helper methods, and
some gotchas


Short history

sbpipb

Enable Redis to Start at Boot
If all of your tests worked, and you would like to start Redis automatically when your server boots, you can enable the systemd service.

To do so, type:

sudo systemctl enable redis
Output
Created symlink from /etc/systemd/system/multi-user.target.wants/redis.service to /etc/systemd/system/redis.service.

sbpipb

Client-side SSL

For excessively paranoid client authentication.

Using self-signed certificate.

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -des3 -out ca.key 4096
openssl req -new -x509 -days 365 -key ca.key -out ca.crt

sbpipb

# app/views/layouts/history.html.arb
panel "Historia" do
  table_for assigns[:versions]
end