From 076b96bd133e4a833f6b8e4cc95a82054f73aedf Mon Sep 17 00:00:00 2001
From: schneems <richard.schneeman@gmail.com>
Date: Thu, 6 Aug 2015 15:37:28 -0500
Subject: [PATCH] String#=~ faster than String#match
If you're only looking for presence of a match and don't need the matchdata, use String#=~
https://github.com/schneems/rails/commit/1bf50badd943e684a56a03392ef0ddafefca0ad7#commitcomment-12572839
---
README.md | 23 +++++++++++++++++++++++
code/string/match-vs-=~.rb | 15 +++++++++++++++
2 files changed, 38 insertions(+)
create mode 100644 code/string/match-vs-=~.rb
diff --git a/README.md b/README.md
index 391de20..6230bec 100644
--- a/README.md
+++ b/README.md
@@ -682,6 +682,29 @@ Comparison:
String#=~: 854830.3 i/s - 3.32x slower
```
+##### `String#match` vs `String#=~` [code ](code/string/match-vs-=~.rb)
+
+> :warning: <br>
+> Sometimes you cant replace `match` with `=~`, <br />
+> This is only useful for cases where you are checkin <br />
+> for a match and not using the resultant match object.
+
+```
+$ ruby -v code/string/match-vs-=~.rb
+ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
+Calculating -------------------------------------
+ String#=~ 69.889k i/100ms
+ String#match 66.715k i/100ms
+-------------------------------------------------
+ String#=~ 1.854M (±12.2%) i/s - 9.155M
+ String#match 1.594M (±11.0%) i/s - 7.939M
+
+Comparison:
+ String#=~: 1853861.7 i/s
+ String#match: 1593971.6 i/s - 1.16x slower
+```
+
+
##### `String#gsub` vs `String#sub` [code](code/string/gsub-vs-sub.rb)
```
diff --git a/code/string/match-vs-=~.rb b/code/string/match-vs-=~.rb
new file mode 100644
index 0000000..8b6dae6
--- /dev/null
+++ b/code/string/match-vs-=~.rb
@@ -0,0 +1,15 @@
+require 'benchmark/ips'
+
+def fast
+ "foo".freeze =~ /boo/
+end
+
+def slow
+ "foo".freeze.match(/boo/)
+end
+
+Benchmark.ips do |x|
+ x.report("String#=~") { fast }
+ x.report("String#match") { slow }
+ x.compare!
+end