diff --git a/lib/youplot/backends/processing.rb b/lib/youplot/backends/processing.rb
index d7bf909..58fa034 100644
--- a/lib/youplot/backends/processing.rb
+++ b/lib/youplot/backends/processing.rb
@@ -21,7 +21,7 @@ module YouPlot
           # compare values
           r = b[1] <=> a[1]
           # If the values are the same, compare by name
-          r = a[0] <=> b[0] if r == 0
+          r = a[0] <=> b[0] if r.zero?
           r
         end
 
diff --git a/lib/youplot/parser.rb b/lib/youplot/parser.rb
index a9d7130..d1d0cd9 100644
--- a/lib/youplot/parser.rb
+++ b/lib/youplot/parser.rb
@@ -163,8 +163,8 @@ module YouPlot
     end
 
     def sub_parser_add_canvas
-      canvas_types = UnicodePlot::Canvas::CANVAS_CLASS_MAP.keys.join(", ")
-      sub_parser.on_head('--canvas STR', String, "type of canvas", "(#{canvas_types})") do |v|
+      canvas_types = UnicodePlot::Canvas::CANVAS_CLASS_MAP.keys.join(', ')
+      sub_parser.on_head('--canvas STR', String, 'type of canvas', "(#{canvas_types})") do |v|
         params.canvas = v.to_sym
       end
     end
diff --git a/test/youplot/iris_test.rb b/test/youplot/iris_test.rb
index bb9223c..4246d99 100644
--- a/test/youplot/iris_test.rb
+++ b/test/youplot/iris_test.rb
@@ -109,7 +109,7 @@ class YouPlotIRISTest < Test::Unit::TestCase
     assert_equal fixture('iris-boxplot.txt'), @stderr_file.read
   end
 
-  # Yeah, lineplot/lineplots don't make sense too. 
+  # Yeah, lineplot/lineplots don't make sense too.
   # Just checking the behavior.
 
   test :c do