Fix Lint/UnusedBlockArgument offenses

Use `each_value` instead of `each` where possible. The performance gain
is minimal (3%).

```
Comparison:
          each_value:  4105733.4 i/s
                each:  3998011.4 i/s - 1.03x  (± 0.00) slower
```

4 files changed, 4 insertions, 12 deletions

diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index fc0449d9..525fd031 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -61,14 +61,6 @@ Lint/NonLocalExitFromIterator:
     - 'lib/axlsx/util/validators.rb'
 
 # This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
-Lint/UnusedBlockArgument:
-  Exclude:
-    - 'lib/axlsx/drawing/axes.rb'
-    - 'lib/axlsx/workbook/worksheet/pivot_table.rb'
-    - 'lib/axlsx/workbook/worksheet/sheet_view.rb'
-
-# This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: AllowUnusedKeywordArguments, IgnoreEmptyMethods, IgnoreNotImplementedMethods.
 Lint/UnusedMethodArgument:
   Exclude:
diff --git a/lib/axlsx/drawing/axes.rb b/lib/axlsx/drawing/axes.rb
index 010fe8cd..f63ef95d 100644
--- a/lib/axlsx/drawing/axes.rb
+++ b/lib/axlsx/drawing/axes.rb
@@ -32,7 +32,7 @@ module Axlsx
     def to_xml_string(str = +'', options = {})
       if options[:ids]
         # CatAxis must come first in the XML (for Microsoft Excel at least)
-        sorted = axes.sort_by { |name, axis| axis.is_a?(CatAxis) ? 0 : 1 }
+        sorted = axes.sort_by { |_name, axis| axis.is_a?(CatAxis) ? 0 : 1 }
         sorted.each { |axis| str << '<c:axId val="' << axis[1].id.to_s << '"/>' }
       else
         axes.each { |axis| axis[1].to_xml_string(str) }
diff --git a/lib/axlsx/workbook/worksheet/pivot_table.rb b/lib/axlsx/workbook/worksheet/pivot_table.rb
index a75842cd..97c4515b 100644
--- a/lib/axlsx/workbook/worksheet/pivot_table.rb
+++ b/lib/axlsx/workbook/worksheet/pivot_table.rb
@@ -210,7 +210,7 @@ module Axlsx
         end
         str << '</rowFields>'
         str << '<rowItems count="' << rows.size.to_s << '">'
-        rows.size.times do |i|
+        rows.size.times do
           str << '<i/>'
         end
         str << '</rowItems>'
@@ -220,7 +220,7 @@ module Axlsx
           str << '<colFields count="1"><field x="-2"/></colFields>'
           str << "<colItems count=\"#{data.size}\">"
           str << '<i><x/></i>'
-          data[1..-1].each_with_index do |datum_value, i|
+          (data.size - 1).times do |i|
             str << "<i i=\"#{i + 1}\"><x v=\"#{i + 1}\"/></i>"
           end
           str << '</colItems>'
diff --git a/lib/axlsx/workbook/worksheet/sheet_view.rb b/lib/axlsx/workbook/worksheet/sheet_view.rb
index 6138cbf7..ee19061a 100644
--- a/lib/axlsx/workbook/worksheet/sheet_view.rb
+++ b/lib/axlsx/workbook/worksheet/sheet_view.rb
@@ -198,7 +198,7 @@ module Axlsx
       serialized_attributes str
       str << '>'
       @pane.to_xml_string(str) if @pane
-      @selections.each do |key, selection|
+      @selections.each_value do |selection|
         selection.to_xml_string(str)
       end
       str << '</sheetView>'