therod

Ruby Cheatsheet

Basic Math Operations

5.4 - 2.2 # Subtraction
4 * 72 # Multiplication
7 / 3.5 # Division
3 ** 7  # Exponentiation

therod

class Person
  attr_accessor :first_name, :last_name, :birth_year, :car_registration

  def initialize(first_name, last_name, birth_year, car_registration)
    @first_name = PersonDataChecker.check_name(first_name)
    @last_name = PersonDataChecker.check_name(last_name)
    @birth_year = PersonDataChecker.check_birth_year(birth_year)
    @car_registration = PersonDataChecker.check_car_registration(car_registration)
  end
end

therod

! Disable everything but the search & video player on YouTube.
www.youtube.com###primary > .ytd-two-column-browse-results-renderer.style-scope
www.youtube.com###secondary
www.youtube.com###guide-inner-content
www.youtube.com##ytd-mini-guide-renderer
www.youtube.com##ytd-watch-next-secondary-results-renderer

therod

mentors = ["Hans", "Ruedi"].shuffle
attendees = ["Klara", "Kevin", "Mike", "Sandro", "Sandy", "Silvan", "Lala"].shuffle
number_of_groups = (attendees.count / mentors.count)

groups = attendees.each_slice(number_of_groups).to_a

mentors.each_with_index do |mentor, index|
  puts "Group #{index + 1}: #{mentor}"
  puts "===================="
  puts groups.shift

therod

require 'pry'
keys = `aws s3api list-objects --bucket master21 --query 'Contents[].{Key: Key}' --output text | grep -v 'folder'`

keys = keys.split("\n")

keys.each do |key|
  system("aws s3api put-object-acl --acl bucket-owner-full-control --bucket master21 --key '#{key}'")
end

therod

require 'open-uri'
require 'prawn'

class OrangeTree

  def initialize
    @height = 0
    @orange_count = 0
    @fruit = 0
    @age = 0

therod

#!/bin/bash
## Remove all local timemachine backups

for i in $(tmutil listlocalsnapshotdates / | awk '{print $1}' | sed -n '1!p' | xargs echo); do tmutil deletelocalsnapshots $i; done

therod

puts "Ha! Did you really think I would give away the solution that easily?"
puts "Try again!"

therod

class OrangeTree
  def initialize
    @height = 0
    @age = 0
    @oranges = 0
    @alive = true
  end

  def one_year_passes
    @alive = false if @height > 10 && rand(2) == 1

therod

require 'date'
require 'active_support/all'

class Person
  attr_accessor :name, :birthdate, :favorite_color

  def initialize(name, birthdate, favorite_color)
    @name = name
    @birthdate = birthdate
    @favorite_color = favorite_color