Support block in CSV::Row#to_h

lib/csv/row.rb

@@ -653,7 +653,10 @@ def ==(other)
     def to_h
       hash = {}
       each do |key, _value|
-        hash[key] = self[key] unless hash.key?(key)
+        value = self[key]
+        key, value = yield(key, value) if block_given?
+
+        hash[key] = value unless hash.key?(key)
       end
       hash
     end

test/csv/test_row.rb

@@ -341,6 +341,12 @@ def test_to_hash
     end
   end
 
+  def test_to_hash_with_block
+    row = CSV::Row.new(%w{A B C}, [1, 2, 3])
+    hash = row.to_hash { |k, v| [k, v ** 2] }
+    assert_equal({"A" => 1, "B" => 4, "C" => 9}, hash)
+  end
+
   def test_to_csv
     # normal conversion
     assert_equal("1,2,3,4,\n", @row.to_csv)