From 6083bca0a8c66ab8ec607bf8d66de5f0fd53637f Mon Sep 17 00:00:00 2001
From: Dmitriy Non <mail@nondv.io>
Date: Tue, 15 Oct 2019 10:03:35 +0100
Subject: [PATCH] [ruby][case] Add a note about ===

A bit advanced but required knowledge about the magic in `case`
---
 sheets/_ruby/case | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sheets/_ruby/case b/sheets/_ruby/case
index 966439e..589bcb2 100644
--- a/sheets/_ruby/case
+++ b/sheets/_ruby/case
@@ -31,3 +31,16 @@ when /food/
 when /doe/
   puts "#{str}, a female deer"
 end
+
+# Please note that `case` uses `===` operator to match values.
+# The following are equivalent:
+case x
+when Integer then "I'm a number"
+when String then "I'm a text"
+end
+
+if Integer === x
+  "I'm a number"
+elsif String === x
+  "I'm a text"
+end