hashdo.rb

#create empty hash
myhash = {}
# or
myh = Hash.new

# keys no value
info = { :name => nil, :address => nil }

#set value of keu
info[:name] = "arpit"

#
info.each do |k,v|
  puts "The key is #{k} and the value is #{v}"
end

# hashes in arrays

one = { :name => "arpit", :city => "philly" }

two = { :name => "dana", :city => "philly" }

three = { :name => "jack", :city => "new york" }

people = [one, two, three]

people.each do |c|
  puts c[:city]
end

# array in hash

one[:hobbies] =  [ "art", "movies", "music"]

# supermarket #of aisles abcd each has random products
#products are bread donuts cornflakes chocolate

products = ["bread", "dountes", "cornflakes", "chocolate"]
aisles = { "a" => [], "b" => [], "c" => [], "d" => [] }

products.each do |p|
  aisles[ p[0] ] << p
end