Apple Picker and Holiday Suppliers

gistfile1.rb

def apple_picker(a)
  puts "Using 'collect':"
  p a.collect{|x| x if x == 'apple'}.compact
  puts "Using 'select':"
  p a.select{|x| x == 'apple'}
end

apple_picker(["apple", "orange", "apple"]) #=> ["apple", "apple"]

puts "'Collect' returns array with values returned by block, but it has same"
puts "no. of values as original array. Any values not returned by block are nil."
puts "I needed 'compact' method to eliminate 'nils.'"
puts
puts "'Select' returns new array containing all elements of ary for which"
puts "the given block returns a true value. No 'nils' or need for 'compact.'"

holiday_supplies = {
  :winter => {
    :christmas => ["Lights", "Wreath"],
    :new_years => ["Party Hats"]
  },
  :summer => {
    :forth_of_july => ["Fireworks", "BBQ"]
  },
  :fall => {
    :thanksgiving => ["Turkey"]
  },
  :spring => {
    :memorial_day => ["BBQ"]
  }
}

#1
puts holiday_supplies[:summer][:forth_of_july][1]
puts
#2 
p holiday_supplies[:winter][:christmas] << 'Stars'
puts
#3
p holiday_supplies[:spring][:memorial_day] << 'Steak'
puts
#4
p holiday_supplies[:spring][:valentines_day] = ['Hearts']
puts

#5
def winter_suppliers(hs)
  wsupplies = hs[:winter].collect do |holiday, supply|
    supply
  end
  wsupplies.flatten!  # flattens nested array: [["Lights", "Wreath"], ["Party Hats"]]
end

p winter_suppliers(holiday_supplies)
puts

#6
def print_supplies(hs)
  hs.each do |season, holidays|
    puts "#{season.capitalize}:"
    holidays.each do |holiday, supply|
      print "  #{holiday.capitalize}: "
      supply.each_with_index do |s, i|
        print "#{s}"
        print " and " if i < supply.size - 1
      end
      puts
    end
  end
end

print_supplies(holiday_supplies)
puts

#7 
def holidays_with_bbqs(hs)
  h = []
  hs.each_value do |holidays|
    holidays.each do |holiday, supply|
      h << holiday if supply.include?('BBQ')
    end
  end
  h
end

p holidays_with_bbqs(holiday_supplies)

# Output
=begin

Using 'collect':
["apple", "apple"]
Using 'select':
["apple", "apple"]
'Collect' returns array with values returned by block, but it has same
no. of values as original array. Any values not returned by block are nil.
I needed 'compact' method to eliminate 'nils.'

'Select' returns new array containing all elements of ary for which
the given block returns a true value. No 'nils' or need for 'compact.'
BBQ

["Lights", "Wreath", "Stars"]

["BBQ", "Steak"]

["Hearts"]

["Lights", "Wreath", "Stars", "Party Hats"]

Winter:
  Christmas: Lights and Wreath and Stars
  New_years: Party Hats
Summer:
  Forth_of_july: Fireworks and BBQ
Fall:
  Thanksgiving: Turkey
Spring:
  Memorial_day: BBQ and Steak
  Valentines_day: Hearts

[:forth_of_july, :memorial_day]

=end