Хеши

# Инициализация хэшей

h1 = Hash.new
h2 = Hash.new "default"
h3 = Hash[ a => 1, b => 2 ]
h4 = { a => 1, b => 2 }

# Методы хэшей

h1.has_key? a
h1.has_value? 1
h1.keys
h1.values
h1.values_at a
h1.index 1
h1.select { |k,v| k>1 }
h1.each { |k,v| puts k }
h1 = h2.merge h3
h1.delete a
h1.delete_if { |k,v| k>1 }
h1.replace n