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class Temperature
  include Comparable
  attr_reader :degrees
  COLD = 20
  HOT = 25

  def initialize(degrees)
    @degrees = degrees
  end

mariorcardoso

class Product < ActiveRecord::Base
  def cost
    Money.new(cents, currency)
  end

  def cost=(cost)
    self.cents = cost.cents
    self.currency = cost.currency.to_s
  end
end

mariorcardoso

> product = Product.create(cost: Money.new(500, "EUR"))
> product.cost
=> #<Money fractional:500 currency:EUR>
> product.cost.cents
=> 500
> product.currency
=> "EUR"

mariorcardoso

class Event < ActiveRecord::Base
  SIZE = %w(
    small
    medium
    big
  )
end

mariorcardoso

class Size
  SIZES = %w(small medium big)
  attr_reader :size

  def initialize(size)
    @size = size
  end

  def self.to_select
    SIZES.map{|c| [c.capitalize, c]}

mariorcardoso

> event = Event.create(name: 'Ruby conf', start_date: Date.today, end_date: Date.today + 1.days)
> event.date_range
=> #<DateRange:0x007fd8760c2690 @start_date=Tue, 06 Jun 2017, @end_date=Fri, 07 Jun 2017>
> event.date_range.include_date?(Date.today)
=> true
> event.date_range.include_date_range?(DateRange.new(Date.today, Date.today + 2.days))
=> false
> event.date_range.include_date_range?(DateRange.new(Date.today, Date.today + 1.days))
=> true

mariorcardoso

> room_1 = Room.create(degrees: 10)
> room_2 = Room.create(degrees: 20)
> room_3 = Room.create(degrees: 30)
> room_1.temperature.cold?
=> true
> room_1.temperature.hot?
=> false
> [room_1.temperature, Temperature.new(20), room_3.temperature, room_2.temperature].sort
=> [#<Temperature:0x007fe194378840 @degrees=10>, #<Temperature:0x007fe194378818 @degrees=20>, #<Temperature:0x007fe1943787c8 @degrees=20>, #<Temperature:0x007fe1943787f0 @degrees=30>]
> [room_1.temperature, Temperature.new(20), room_3.temperature, room_2.temperature].uniq

mariorcardoso

class DateRange < Value.new(:start_date, :end_date)
  def include_date?(date)
    date >= start_date && date <= end_date
  end

  def include_date_range?(date_range)
    start_date <= date_range.start_date && end_date >= date_range.end_date
  end

  def overlap_date_range?(date_range)

mariorcardoso

# Xcode Command-line Tools
xcode-select --install

# Productivity
brew install --cask rectangle
brew install notion

# Finder settings
# Show hidden files
defaults write com.apple.finder AppleShowAllFiles TRUE

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export const ScreenshotTool = () => {
  ...

  return (
    <Fragment>
      <div>
        <button disabled={canCapture} onClick={startImagePreview}>
          Preview
        </button>
        <button disabled={!canCapture} onClick={captureImageInPreview}>