From b0d790d2162c206c0955b0889068f4f8060080a7 Mon Sep 17 00:00:00 2001
From: Timur Tarasenko <timur.tarasenko@gmail.com>
Date: Tue, 9 Oct 2018 23:11:29 -0500
Subject: [PATCH] Refactoing flatten.map

---
 lib/onix/onix21.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/onix/onix21.rb b/lib/onix/onix21.rb
index ceb02df..1c56cd0 100644
--- a/lib/onix/onix21.rb
+++ b/lib/onix/onix21.rb
@@ -399,7 +399,7 @@ def clil_categories_codes
 
       def keywords
         kws=(@main_subjects + @subjects).select { |s| s.scheme_identifier.human=="Keywords" }.map { |kw| kw.heading_text }.compact
-        kws.map { |kw| kw.split(/;|,|\n/) }.flatten.map { |kw| kw.strip }
+        kws.map { |kw| kw.split(/;|,|\n/) }.flat_map { |kw| kw.strip }
       end
 
       # doesn't apply