# Use reduce to get the sum of an array
a = [1, 2, 3]
a.reduce :+ # => 6

# Use reduce to get the factorial of a number
(1..n).reduce(1, :*)

<<~DOC
  Use reduce to get the sum of an array
DOC

a = [1, 2, 3]
a.reduce :+ # => 6

--- 
+++ 
@@ -1,6 +1,6 @@
-<<~DOC
-  Use reduce to get the sum of an array
-DOC
-
+# Use reduce to get the sum of an array
 a = [1, 2, 3]
 a.reduce :+ # => 6
+
+# Use reduce to get the factorial of a number
+(1..n).reduce(1, :*)
Use reduce to compute factorials
