08 - printing a hash.rb

O Reilly Ruby Cookbook source code

h = {}
h[:name] = "Robert"
h[:nickname] = "Bob"
h[:age] = 43
h[:email_addresses] = {:home => "[e-mail]", 
                       :work => "[e-mail]"}
h
# => {:email_addresses=>["[e-mail]", "[e-mail]"], 
#      :nickname=>"Bob", :name=>"Robert", :age=>43}
puts h
# [e-mail]@example.com
puts h[:email_addresses]
# [e-mail]@example.com
#---
p h[:email_addresses]
# {:home=>"[e-mail]", :work=>"[e-mail]"}
#---
p h
# {:nickname=>"Bob", :age=>43, :name=>"Robert", :email_addresses=>{:home=>"[e-mail]", :work=>"[e-mail]"}}
#---
require 'pp'
pp h[:email_addresses]
# {:home=>"[e-mail]", :work=>"[e-mail]"}

pp h
# {:email_addresses=>{:home=>"[e-mail]", :work=>"[e-mail]"},
#  :nickname=>"Bob",
#  :name=>"Robert",
#  :age=>43}
#---
PP::pp(h, $stderr, 50)
# {:nickname=>"Bob",
#  :phone_numbers=>
#   {:cell=>"[phone]",
#    :home=>"[phone]",
#    :fax=>"[phone]",
#    :work=>"[phone]"},
#  :email_addresses=>
#   {:home=>"[e-mail]",
#   :work=>"[e-mail]"},
#  :age=>43,
#  :name=>"Robert"}
# => #<IO:0x2c8cc>
#---
require 'yaml'
puts h.to_yaml
# --- 
# :nickname: Bob
# :age: 43
# :name: Robert
# :email_addresses:
#   :home: [e-mail]
#   :work: [e-mail]
#---
h[:email_addresses].each do |key, val|
  puts "#{key} => #{val}"
end
# home => [e-mail]
# work => [e-mail]
#---