--- /dev/null
+#
+# intersection.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:intersection, :type => :rvalue, :doc => <<-EOS
+This function returns an array an intersection of two.
+
+*Examples:*
+
+ intersection(["a","b","c"],["b","c","d"])
+
+Would return: ["b","c"]
+ EOS
+ ) do |arguments|
+
+ # Two arguments are required
+ raise(Puppet::ParseError, "intersection(): Wrong number of arguments " +
+ "given (#{arguments.size} for 2)") if arguments.size != 2
+
+ first = arguments[0]
+ second = arguments[1]
+
+ unless first.is_a?(Array) && second.is_a?(Array)
+ raise(Puppet::ParseError, 'intersection(): Requires 2 arrays')
+ end
+
+ result = first & second
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :