--- /dev/null
+module Puppet::Parser::Functions
+ newfunction(:delete_undef_values, :type => :rvalue, :doc => <<-EOS
+Returns a copy of input hash or array with all undefs deleted.
+
+*Examples:*
+
+ $hash = delete_undef_values({a=>'A', b=>'', c=>undef, d => false})
+
+Would return: {a => 'A', b => '', d => false}
+
+ $array = delete_undef_values(['A','',undef,false])
+
+Would return: ['A','',false]
+
+ EOS
+ ) do |args|
+
+ raise(Puppet::ParseError,
+ "delete_undef_values(): Wrong number of arguments given " +
+ "(#{args.size})") if args.size < 1
+
+ unless args[0].is_a? Array or args[0].is_a? Hash
+ raise(Puppet::ParseError,
+ "delete_undef_values(): expected an array or hash, got #{args[0]} type #{args[0].class} ")
+ end
+ result = args[0].dup
+ if result.is_a?(Hash)
+ result.delete_if {|key, val| val.equal? :undef}
+ elsif result.is_a?(Array)
+ result.delete :undef
+ end
+ result
+ end
+end