diff --git a/lib/puppet/parser/functions/ipaddresses.rb b/lib/puppet/parser/functions/ipaddresses.rb
index 9d9ff6c..432871d 100644
--- a/lib/puppet/parser/functions/ipaddresses.rb
+++ b/lib/puppet/parser/functions/ipaddresses.rb
@@ -1,41 +1,41 @@
 module Puppet::Parser::Functions
   newfunction(:ipaddresses, type: :rvalue, doc: <<-EOS
   Returns all ip addresses of network interfaces (except lo) found by facter.
   Special network interfaces (e.g. docker0) can be excluded by an exclude list as
   first argument for this function.
 EOS
              ) do |args|
     networking = lookupvar('networking')
 
     # always exclude loopback interface
     interfaces_exclude = ['lo']
     if args.size == 1
       unless args[0].is_a?(Array)
         raise(Puppet::ParseError, 'ipaddresses(): Requires first argument to be an Array')
       end
       interfaces_exclude << args[0]
     end
 
-    return false if not networking.include?('interfaces')
+    return false unless networking.include?('interfaces')
 
     result = []
     networking['interfaces'].each do |iface, data|
       # skip excluded interfaces
       next if interfaces_exclude.include?(iface)
 
-      ['bindings', 'bindings6'].each do |binding_type|
-        next if not data.key?(binding_type)
+      %w[bindings bindings6].each do |binding_type|
+        next unless data.key?(binding_type)
         data[binding_type].each do |binding|
-          next if not binding.key?('address')
+          next unless binding.key?('address')
           result << binding['address']
         end
       end
     end
 
     # Throw away any v6 link-local addresses
     fe8064 = IPAddr.new('fe80::/64')
     result.delete_if { |ip| fe8064.include? IPAddr.new(ip) }
 
     return result.uniq
   end
 end