lib/axlsx/drawing/bubble_chart.rb in caxlsx-3.4.1 vs lib/axlsx/drawing/bubble_chart.rb in caxlsx-4.0.0

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 module Axlsx
   # The BubbleChart allows you to insert a bubble chart into your worksheet
   # @see Worksheet#add_chart
   # @see Chart#add_series
   # @see README for an example
@@ -31,26 +33,26 @@
     end
 
     # Serializes the object
     # @param [String] str
     # @return [String]
-    def to_xml_string(str = '')
+    def to_xml_string(str = +'')
       super(str) do
         str << '<c:bubbleChart>'
-        str << ('<c:varyColors val="' << vary_colors.to_s << '"/>')
+        str << '<c:varyColors val="' << vary_colors.to_s << '"/>'
         @series.each { |ser| ser.to_xml_string(str) }
         d_lbls.to_xml_string(str) if @d_lbls
-        axes.to_xml_string(str, :ids => true)
+        axes.to_xml_string(str, ids: true)
         str << '</c:bubbleChart>'
         axes.to_xml_string(str)
       end
       str
     end
 
     # The axes for the bubble chart. BubbleChart has an x_val_axis and
     # a y_val_axis
     # @return [Axes]
     def axes
-      @axes ||= Axes.new(:x_val_axis => ValAxis, :y_val_axis => ValAxis)
+      @axes ||= Axes.new(x_val_axis: ValAxis, y_val_axis: ValAxis)
     end
   end
 end