From 4b2912abc4a83c924c07b593badce70c409776b1 Mon Sep 17 00:00:00 2001
From: Alexander Popov <alex.wayfer@gmail.com>
Date: Thu, 19 Jul 2018 16:28:40 +0300
Subject: [PATCH] Remove `String#casecmp` rule

Because this method doesn't work with Unicode,
and `#downcase` does (since Ruby 2.4).
---
 README.md                             | 18 ------------------
 code/string/casecmp-vs-downcase-==.rb | 17 -----------------
 2 files changed, 35 deletions(-)
 delete mode 100644 code/string/casecmp-vs-downcase-==.rb

diff --git a/README.md b/README.md
index 677a7a9..8952926 100644
--- a/README.md
+++ b/README.md
@@ -1007,24 +1007,6 @@ $ ruby -v code/string/dup-vs-unary-plus.rb
             String#dup:  3566485.7 i/s - 2.16x  slower
 ```
 
-##### `String#casecmp` vs `String#downcase + ==` [code](code/string/casecmp-vs-downcase-==.rb)
-
-```
-$ ruby -v code/string/casecmp-vs-downcase-\=\=.rb
-ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
-
-Calculating -------------------------------------
-String#downcase + ==   101.900k i/100ms
-      String#casecmp   109.828k i/100ms
--------------------------------------------------
-String#downcase + ==      2.915M (± 5.4%) i/s -     14.572M
-      String#casecmp      3.708M (± 6.1%) i/s -     18.561M
-
-Comparison:
-      String#casecmp:  3708258.7 i/s
-String#downcase + ==:  2914767.7 i/s - 1.27x slower
-```
-
 ##### String Concatenation [code](code/string/concatenation.rb)
 
 ```
diff --git a/code/string/casecmp-vs-downcase-==.rb b/code/string/casecmp-vs-downcase-==.rb
deleted file mode 100644
index 027f748..0000000
--- a/code/string/casecmp-vs-downcase-==.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-require 'benchmark/ips'
-
-SLUG = 'ABCD'
-
-def slow
-  SLUG.downcase == 'abcd'
-end
-
-def fast
-  SLUG.casecmp('abcd') == 0
-end
-
-Benchmark.ips do |x|
-  x.report('String#downcase + ==') { slow }
-  x.report('String#casecmp')       { fast }
-  x.compare!
-end