--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/1-Ruby/logic.rb	Mon Jan 02 20:56:58 2017 +0000
@@ -0,0 +1,34 @@
+#! /usr/bin/env ruby
+
+x = 4
+
+# "if" block is "if… end" - no "then" required
+if x == 4
+	puts "x equals 4"
+end
+
+# Python- and Perl-like following logic also works
+puts "x equals 4" if x == 4
+puts "x equals 4" unless x != 4
+
+# Negation has many forms.
+# Simple logic:
+if x != 5
+	puts "x not equal 5"
+end
+
+# Two options on negation
+if !(x == 5)
+	puts "x not equal 5"
+end
+
+if not x == 5
+	puts "x not equal 5"
+end
+
+# "unless" blocks instead of "if"
+unless x != 4
+	puts "x equal 4"
+else
+	puts "x not equals 4"
+end
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