From a4e747969f3dbda5cff1ee4801207acfb6367c34 Mon Sep 17 00:00:00 2001
From: kojix2 <2xijok@gmail.com>
Date: Fri, 28 May 2021 10:24:45 +0900
Subject: [PATCH] Use value_counts if tally is not available

---
 lib/youplot/backends/processing.rb | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/youplot/backends/processing.rb b/lib/youplot/backends/processing.rb
index 5ce6a8f..bff0b4e 100644
--- a/lib/youplot/backends/processing.rb
+++ b/lib/youplot/backends/processing.rb
@@ -11,10 +11,11 @@ module YouPlot
         if tally && Enumerable.method_defined?(:tally)
           arr.tally
         else
-          # https://github.com/marcandre/backports
-          arr.each_with_object(Hash.new(0)) { |item, res| res[item] += 1 }
-             .tap { |h| h.default = nil }
+          # value_counts Enumerable::Statistics
+          arr.value_counts(dropna: false)
         end
+          # faster than `.sort_by{|a| a[1]}`, `.sort_by(a:last)`
+          #             `.sort{ |a, b| -a[1] <=> -b[1] }
           .sort { |a, b| a[1] <=> b[1] }
           .reverse
           .transpose