Fix Style/SymbolProc offenses

This also provides a performance improvement

```
Comparison (array of 4 elements):
              map(&):  3643131.4 i/s
              map {}:  3488052.5 i/s - 1.04x  (± 0.00) slower

Comparison (array of 20 elements):
              map(&):   466013.9 i/s
              map {}:   408447.2 i/s - 1.14x  (± 0.00) slower
```

5 files changed, 7 insertions, 7 deletions

diff --git a/lib/axlsx/drawing/drawing.rb b/lib/axlsx/drawing/drawing.rb
index 8cb3e2cc..fa7a608c 100644
--- a/lib/axlsx/drawing/drawing.rb
+++ b/lib/axlsx/drawing/drawing.rb
@@ -109,14 +109,14 @@ module Axlsx
     # @return [Array]
     def hyperlinks
       links = self.images.select { |a| a.hyperlink.is_a?(Hyperlink) }
-      links.map { |a| a.hyperlink }
+      links.map(&:hyperlink)
     end
 
     # An array of image objects that are associated with this drawing's anchors
     # @return [Array]
     def images
       images = @anchors.select { |a| a.object.is_a?(Pic) }
-      images.map { |a| a.object }
+      images.map(&:object)
     end
 
     # The index of this drawing in the owning workbooks's drawings collection.
diff --git a/lib/axlsx/stylesheet/styles.rb b/lib/axlsx/stylesheet/styles.rb
index c3dd8d06..2bad15e8 100644
--- a/lib/axlsx/stylesheet/styles.rb
+++ b/lib/axlsx/stylesheet/styles.rb
@@ -470,7 +470,7 @@ module Axlsx
       # When the type is :dxf we always need to create a new numFmt object
       if options[:format_code] || options[:type] == :dxf
         # If this is a standard xf we pull from numFmts the highest current and increment for num_fmt
-        options[:num_fmt] ||= (@numFmts.map { |num_fmt| num_fmt.numFmtId }.max + 1) if options[:type] != :dxf
+        options[:num_fmt] ||= (@numFmts.map(&:numFmtId).max + 1) if options[:type] != :dxf
         numFmt = NumFmt.new(:numFmtId => options[:num_fmt] || 0, :formatCode => options[:format_code].to_s)
         options[:type] == :dxf ? numFmt : (numFmts << numFmt; numFmt.numFmtId)
       else
diff --git a/lib/axlsx/workbook/workbook.rb b/lib/axlsx/workbook/workbook.rb
index ec80d6dc..2c6e0491 100644
--- a/lib/axlsx/workbook/workbook.rb
+++ b/lib/axlsx/workbook/workbook.rb
@@ -171,7 +171,7 @@ module Axlsx
     # @see Comment
     # @return [Comments]
     def comments
-      worksheets.map { |sheet| sheet.comments }.compact
+      worksheets.map(&:comments).compact
     end
 
     # The styles associated with this workbook
@@ -369,7 +369,7 @@ module Axlsx
     # generates a shared string object against all cells in all worksheets.
     # @return [SharedStringTable]
     def shared_strings
-      SharedStringsTable.new(worksheets.collect { |ws| ws.cells }, xml_space)
+      SharedStringsTable.new(worksheets.collect(&:cells), xml_space)
     end
 
     # The xml:space attribute for the worksheet.
diff --git a/lib/axlsx/workbook/worksheet/worksheet.rb b/lib/axlsx/workbook/worksheet/worksheet.rb
index aaeadb11..1ece3138 100644
--- a/lib/axlsx/workbook/worksheet/worksheet.rb
+++ b/lib/axlsx/workbook/worksheet/worksheet.rb
@@ -760,7 +760,7 @@ module Axlsx
       raise ArgumentError, (ERR_SHEET_NAME_CHARACTER_FORBIDDEN % name) if WORKSHEET_NAME_FORBIDDEN_CHARS.any? { |char| name.include? char }
 
       name = Axlsx::coder.encode(name)
-      sheet_names = @workbook.worksheets.reject { |s| s == self }.map { |s| s.name }
+      sheet_names = @workbook.worksheets.reject { |s| s == self }.map(&:name)
       raise ArgumentError, (ERR_DUPLICATE_SHEET_NAME % name) if sheet_names.include?(name)
     end
 
diff --git a/lib/axlsx/workbook/worksheet/worksheet_hyperlinks.rb b/lib/axlsx/workbook/worksheet/worksheet_hyperlinks.rb
index f19630f8..334b59da 100644
--- a/lib/axlsx/workbook/worksheet/worksheet_hyperlinks.rb
+++ b/lib/axlsx/workbook/worksheet/worksheet_hyperlinks.rb
@@ -24,7 +24,7 @@ module Axlsx
     def relationships
       return [] if empty?
 
-      map { |hyperlink| hyperlink.relationship }
+      map(&:relationship)
     end
 
     # seralize the collection of hyperlinks