Add What To Do When You Don't Rescue as a ruby til

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_826 TILs and counting..._
+_827 TILs and counting..._
 
 ---
 
@@ -685,6 +685,7 @@ _826 TILs and counting..._
 - [Use A Case Statement As A Cond Statement](ruby/use-a-case-statement-as-a-cond-statement.md)
 - [Use dotenv In A Non-Rails Project](ruby/use-dotenv-in-a-non-rails-project.md)
 - [Using BCrypt To Create And Check Hashed Passwords](ruby/using-bcrypt-to-create-and-check-hashed-passwords.md)
+- [What To Do When You Don't Rescue](ruby/what-to-do-when-you-dont-rescue.md)
 - [Who Are My Ancestors?](ruby/who-are-my-ancestors.md)
 - [Wrap Things In An Array, Even Hashes](ruby/wrap-things-in-an-array-even-hashes.md)
 - [Zero Padding](ruby/zero-padding.md)

ruby/what-to-do-when-you-dont-rescue.md

@@ -0,0 +1,35 @@
+# What To Do When You Don't Rescue
+
+Ruby's `rescue` syntax supports a couple different blocks. I was already
+familiar with `ensure` which is a block of code that will be executed
+regardless of whether or not an exception was rescued.
+
+```ruby
+begin
+  do_something_that_could_fail()
+rescue StandardError => e
+  // oh no!
+ensure
+  Logging.info("We attempted to do the thing.")
+end
+```
+
+What if you want to differentiatee between an instance when your code ran
+without incident and when there was an exception? Ruby's `rescue` syntax also
+supports an `else` block. The `else` block is executed only when nothing is
+rescued.
+
+```ruby
+begin
+  do_something_that_could_fail()
+rescue StandardError => e
+  Logging.info("We tried to do something and it failed.")
+else
+  Logging.info("We successfully did the thing!")
+end
+```
+
+There are a lot of ways to use this. Here I was able to differentiate the
+messaging in my logging based on whether or not an exception occurred.
+
+[source](https://blog.bigbinary.com/2017/10/24/ruby-2.5-allows-rescue-inside-do-end-blocks.html)