WagnerMatos

Stimulus cheatsheet

• Website: https://stimulusjs.org/
• GitHub repo: https://github.com/stimulusjs/stimulus
• Handbook: https://stimulusjs.org/handbook/introduction
• Discourse: https://discourse.stimulusjs.org/

Lifecycle callbacks

• initialize: once, when the controller is first instantiated
• connect: anytime the controller is connected to the DOM

WagnerMatos

Tabs and Windows

Function	Shortcut
New Tab	⌘ + T
Close Tab or Window	⌘ + W (same as many mac apps)
Go to Tab	⌘ + Number Key (ie: ⌘2 is 2nd tab)
Go to Split Pane by Direction	⌘ + Option + Arrow Key
Cycle iTerm Windows	⌘ + backtick (true of all mac apps and works with desktops/mission control)

WagnerMatos

MergeSort Algorithm in Ruby

When learning about sorting algorithms, I wanted to implement them to help me understand them better. This algorithm was originally invented by John von Neumann in 1948.

The Ruby script attached explains in real code what is going on. Play about with it.

How does the algorithm work?

Step by step:

• Pass through an array of unsorted numbers (i.e. [4, 3, 2, 10])

WagnerMatos

require 'benchmark/ips'

def find_one_using_group_by_select(array)
 array.group_by{ |e| e }.detect { |k, v| k if v.size > 1 }&.first
end

def find_one_using_chunk_select(array)
 array.sort.chunk{ |e| e }.detect { |e, chunk| chunk.size > 1 }&.first
end

WagnerMatos

MySQL

Getting started

• http://www.sqlteaching.com/
• https://www.codecademy.com/learn/learn-sql

Related tutorials

• MySQL-CLI
• Analyzing Business Metrics
• SQL joins infografic

WagnerMatos

# editorconfig.org
root = true

[*]
indent_style = space
indent_size = 2
tab_width = 2
end_of_line = lf
charset = utf-8
max_line_length = 80

WagnerMatos

AllCops:
  RunRailsCops: true

# Commonly used screens these days easily fit more than 80 characters.
Metrics/LineLength:
  Max: 120

# Too short methods lead to extraction of single-use methods, which can make
# the code easier to read (by naming things), but can also clutter the class
Metrics/MethodLength: 

WagnerMatos

class Something(Base):
    __tablename__ = 'yaddayadda'

    id = Column(Integer, primary_key=True)
    data = Column(MutableList.as_mutable(ARRAY(String(100))))

WagnerMatos

# Generate and use an oauth2 bearer token for the Twitter API in Ruby
#
# For Application-Only authentication to the twitter API, a 'bearer token'
# is required to authenticate agains their endpoints for rate limiting
# purposes.
# 
# This script generates a bearer token by posting to twitter and then it
# uses that token to poll their API.
#
# Note, the base 64 encoded consumer credentials for the bearer token needs

WagnerMatos

web: bundle exec rails server puma -p $PORT -e $RACK_ENV
critical: env HEROKU_PROCESS=critical bundle exec sidekiq -c 2 -q critical,4
default: env HEROKU_PROCESS=default bundle exec sidekiq -c 4 -q default,2
low: env HEROKU_PROCESS=low bundle exec sidekiq -c 1 -q low,1