--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/stdlib/lib/puppet/parser/functions/union.rb	Sat Mar 14 20:09:45 2015 +0000
@@ -0,0 +1,34 @@
+#
+# union.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:union, :type => :rvalue, :doc => <<-EOS
+This function returns a union of two arrays.
+
+*Examples:*
+
+    union(["a","b","c"],["b","c","d"])
+
+Would return: ["a","b","c","d"]
+    EOS
+  ) do |arguments|
+
+    # Two arguments are required
+    raise(Puppet::ParseError, "union(): 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, 'union(): Requires 2 arrays')
+    end
+
+    result = first | second
+
+    return result
+  end
+end
+
+# vim: set ts=2 sw=2 et :