bagwanpankaj · January 29, 2011 06:38
diff --git a/dafault_proc_1.rb b/dafault_proc_1.rb
 hs = Hash.new
 hs[:absent_key]
 # => {}
 hs[:absent_key][:some_other_key]
 # NoMethodError: undefined method `[]' for nil:NilClass
diff --git a/dafault_proc_2.rb b/dafault_proc_2.rb
 hs = Hash.new("not present")
 hs[:absent_key]
 # => "not present"
diff --git a/dafault_proc_3.rb b/dafault_proc_3.rb
 hs = Hash.new{|k,v| Hash.new(&k.default_proc)}
 hs[:absent_key][:another_key]
 #=> {}
 hs[:absent_key][:another_key][:b]
 #=> {}
	hs = Hash.new
	hs[:absent_key]
	# => {}
	hs[:absent_key][:some_other_key]
	# NoMethodError: undefined method `[]' for nil:NilClass
	hs = Hash.new{\|k,v\| Hash.new(&k.default_proc)}
	hs[:absent_key][:another_key]
	#=> {}
	hs[:absent_key][:another_key][:b]
	#=> {}