hashes-and-symbols.rb

user = {}
puts user["first_name"] = "Michael"
puts user["last_name"] = "Hartl"
puts user["first_name"]
puts user

puts s = String.new("foobar")
p s.class
p s == "foobar"

puts a = Array.new([1,3,2])

puts h = Hash.new
h[:foo]

puts h = Hash.new(0)

puts h[:foo]