Ruby: Holiday Supplies and Apple Picker - working with hashes and select/collect

apple_picker.rb

# Using collect, we have to explicitly set the return value
# And then to clean up - use compact to eliminate nils
def apple_picker(foods)
  apples = (foods.collect do |food|
    if food == "apple"
      food
    end
  end).compact
end

p apple_picker(["apple", "orange", "apple"])

# With select, we are given the value if our conditional returns true
# No need to clean up nil since it isn't even returned
def apple_picker(foods)
  apples = foods.select do |food|
    food == "apple"
  end
end

p apple_picker(["apple", "orange", "apple"])

holiday_supplies.rb

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

# 1. Access the second supply for forth_of_july
p holiday_supplies[:summer][:forth_of_july][1]

# 5. All supplies from all winter holidays
list = (holiday_supplies[:winter].collect do |holiday, supply_list|
  supply_list.collect do |item|
    item
  end
end).flatten

p list

# 6. All supplies for each holiday and season
holiday_supplies.each do |season, holiday_hash|
  puts season

  holiday_hash.each do |holiday, supply_list|
    puts "  #{holiday}"

    supply_list.each do |supply|
      puts "    #{supply}"
    end
  end
end