From 6d7a922da4e21bbe28e9a13a44a98d29e18a1aac Mon Sep 17 00:00:00 2001
From: Koichi ITO <koic.ito@gmail.com>
Date: Sat, 20 Mar 2021 01:20:44 +0900
Subject: [PATCH] Add new "String#chars" rule

Follow https://github.com/rubocop/rubocop/pull/9615.

This PR adds "String#chars" rule.

```ruby
# bad
string.split(//)
string.split('')

# good
string.chars
```
---
 README.adoc | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.adoc b/README.adoc
index 597bd8d8..5c695d28 100644
--- a/README.adoc
+++ b/README.adoc
@@ -4524,6 +4524,22 @@ url.sub('http://', 'https://')
 str.tr('-', '_')
 ----
 
+=== `String#chars` [[string-chars]]
+
+Prefer the use of `String#chars` over `String#split` with empty string or regexp literal argument.
+
+NOTE: These cases have the same behavior since Ruby 2.0.
+
+[source,ruby]
+----
+# bad
+string.split(//)
+string.split('')
+
+# good
+string.chars
+----
+
 === `sprintf` [[sprintf]]
 
 Prefer the use of `sprintf` and its alias `format` over the fairly cryptic `String#%` method.