From 91a75f2952f2f53743697f298918157ae45a3051 Mon Sep 17 00:00:00 2001
From: Yauheni Dakuka <yauheni.dakuka@gmail.com>
Date: Sun, 15 Feb 2026 14:52:54 +0400
Subject: [PATCH] Add guideline for minimizing negations in conditionals

---
 README.adoc | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/README.adoc b/README.adoc
index cb5b0333..cb3e505a 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1736,6 +1736,32 @@ else
 end
 ----
 
+=== Minimize Negations in Conditionals [[minimize-negations]]
+
+Prefer the conditional form (`if` or `unless`) that results in fewer negations.
+When negated terms outnumber positive terms in a condition, flip the keyword and invert the condition.
+
+[source,ruby]
+----
+# bad
+do_something if !foo && !bar
+
+# good
+do_something unless foo || bar
+
+# bad
+do_something unless !foo && !bar
+
+# good
+do_something if foo || bar
+
+# bad
+do_something unless x != 1 && y != 2
+
+# good
+do_something if x == 1 || y == 2
+----
+
 === Parentheses around Condition [[no-parens-around-condition]]
 
 Don't use parentheses around the condition of a control expression.