gl.rb

def create_list (items)
  items_arr = items.split(" ")
  grocery_list = {}

  items_arr.each do |items|
    grocery_list[items] = 1
  end

  return grocery_list
end

def add_item(grocery_list, item, quantity)
  grocery_list[item] = quantity.to_i
  return grocery_list
end

def remove_item(grocery_list, item)
  grocery_list.delete(item)
  return grocery_list
end

def update_item (grocery_list, item, quantity)
  if grocery_list[item] == nil
    puts "Item does not exist; please add item if desired"
  else grocery_list[item] = quantity.to_i
  end
  grocery_list
end

def print_grocery_list(grocery_list)
  grocery_list.each do |item, quantity|
    puts "You have entered #{item}; you need #{quantity} of them"
  end
end


list = create_list("carrots apples cereal pizza")
puts list
list = add_item(list, "celery", 1)
puts list
list = remove_item(list, "carrots")
puts list
list = update_item(list, "celery", 3)
puts list
list = update_item(list, "grapes", 4)
puts list

print_grocery_list(list)