From f6eea601777cd885287595e318b70c268d3ff591 Mon Sep 17 00:00:00 2001
From: jbranchaud <jbranchaud@gmail.com>
Date: Sat, 19 Sep 2015 14:49:36 -0500
Subject: [PATCH] Add Zero Padding as a ruby til.

---
 README.md            |  1 +
 ruby/zero-padding.md | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 ruby/zero-padding.md

diff --git a/README.md b/README.md
index bb8e327..63469e3 100644
--- a/README.md
+++ b/README.md
@@ -141,6 +141,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Summing Collections](ruby/summing-collections.md)
 - [Uncaught Exceptions In Pry](ruby/uncaught-exceptions-in-pry.md)
 - [`undef_method` And The Inheritance Hierarchy](ruby/undef-method-and-the-inheritance-hierarchy.md)
+- [Zero Padding](ruby/zero-padding.md)
 
 ### tmux
 
diff --git a/ruby/zero-padding.md b/ruby/zero-padding.md
new file mode 100644
index 0000000..b728482
--- /dev/null
+++ b/ruby/zero-padding.md
@@ -0,0 +1,22 @@
+# Zero Padding
+
+Ruby makes zero-padding strings to a fixed length easy with `String#rjust`.
+
+```ruby
+> "1234".rjust(6, "0")
+=> "001234"
+> "123456".rjust(6, "0")
+=> "123456"
+```
+
+In the same way, you can pad zeros on the other side of the string with
+`String#ljust`.
+
+```ruby
+> "12".ljust(4, "0")
+=> "1200"
+> "".ljust(4, "0")
+=> "0000"
+```
+
+h/t Dillon Hafer