style: avoid multiple assignments to same variable in conditional

.rubocop.yml

@@ -46,6 +46,9 @@ Style/ClassAndModuleChildren:
   Exclude:
     - "spec/**/*"
 
+Style/ConditionalAssignment:
+  Enabled: true
+
 Style/Encoding:
   Enabled: true
 

lib/rack/attack/track.rb

@@ -8,11 +8,12 @@ module Rack
       def initialize(name, options = {}, &block)
         options[:type] = :track
 
-        if options[:limit] && options[:period]
-          @filter = Throttle.new(name, options, &block)
-        else
-          @filter = Check.new(name, options, &block)
-        end
+        @filter =
+          if options[:limit] && options[:period]
+            Throttle.new(name, options, &block)
+          else
+            Check.new(name, options, &block)
+          end
       end
 
       def matched_by?(request)