psparrow

1/3/03<br>
1/4/03<br>
7/30/03<br>
8/2/03<br>
8/3/03<br>
11/28/03<br>
11/29/03<br>
8/14/04<br>
8/15/04<br>
3/8/09<br>

psparrow

module Funk
  def self.[](key) 
    klass = key.to_s.split(/_/).map(&:capitalize).join

    Module.new do   
      define_singleton_method(:included) do |base|
        base.define_singleton_method(key) do 
          Object.const_get(klass)
        end
      end

psparrow

class Candlestick
  attr_reader :open, :close, :high, :low
  
  def initialize(open, close, high, low)
    @open = open
    @close = close
    @high = high
    @low = low
  end
end

psparrow

account = Account.new
account.portfolio # => {}

account.buy(:SNDL, 100)
account.portfolio # => { SNDL: 100 }

account.sell(:SNDL, 25)
account.portfolio # => { SNDL: 75 }

account.buy(:AMC, 10)

psparrow

class Account
  attr_reader :portfolio
  
  def initialize
    @portfolio = Hash.new(0)
  end
  
  def buy(ticker, number_of_shares)
    @portfolio[ticker] += number_of_shares
  end

psparrow

class Candlestick
  # ...
  
  def upper_wick?
    high > [open, close].max
  end
  
  def lower_wick?
    low < [open , close].min
  end

psparrow

candlestick = Candlestick.new(1.05, 1.2, 1.23, 1.0)
candlestick.open # => 1.05
candlestick.close # => 1.2
candlestick.high # => 1.23
candlestick.low # => 1.0

psparrow

ticker = 'AMC'
trading_is_fun = true
favorite_tickers = ['AMC', 'GME', 'SNDL']
target_price = 2.50

psparrow

# 13: Implement Comparison Via "<=>" and Comparable module
#
# Worthington's Law: A person who makes more money than you is 
# better than you, and is therefore beyond criticism.
#
# - Mr. Show w/ Bob and David (https://www.youtube.com/watch?v=y6WEo9Ix_7Q)

class Person
  attr_reader :name, :net_worth
  

psparrow

post '/products' do 
  if CreateProduct.call(params['product'])
    session[:message] = 'Success!'
    redirect '/products'
  else 
    render_new_product_form
  end
end

class CreateProduct