From 68d874bb0338a63311c191d17bef083e5b61e392 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Franti=C5=A1ek=20Svoboda?= <frantisek.svoboda@showmax.com>
Date: Fri, 5 May 2017 16:11:34 +0200
Subject: [PATCH] Hash#select#values vs Hash#values#select vs
 Hash#values#compact

---
 code/hash/select-vs-values.compact.rb | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 code/hash/select-vs-values.compact.rb

diff --git a/code/hash/select-vs-values.compact.rb b/code/hash/select-vs-values.compact.rb
new file mode 100644
index 0000000..e1cf5c4
--- /dev/null
+++ b/code/hash/select-vs-values.compact.rb
@@ -0,0 +1,24 @@
+require 'benchmark/ips'
+
+ARRAY = Array.new(1000) { Random.rand }
+VALUES = ARRAY.map { |v| v < 0.5 }
+HASH = Hash[ARRAY.zip(VALUES)]
+
+def fastest
+  HASH.values.compact
+end
+
+def fast
+  HASH.values.select { |v| v }
+end
+
+def slow
+  HASH.select { |_k, v| v }.values
+end
+
+Benchmark.ips do |x|
+  x.report('Hash#select#values') { slow }
+  x.report("Hash#values.select") { fast }
+  x.report("Hash#values#compact") { fastest }
+  x.compare!
+end
\ No newline at end of file