Ruby Weekly
Issue 221 — November 13, 2014
All include a security fix for CVE-2014-8090, another XML expansion based DoS vulnerability found in REXML.

Justin Weiss
Have you ever wanted to pass a method to a function that only takes a block? Or figure out which of your object’s superclasses broke the method you’re trying to call?

Ben Lewis
Ben Lewis decided to try and implement a Python style list comprehension mechanism in Ruby. Here he explains some things he learnt along the way.

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Adam Cooke
A walkthrough of creating a simple internal DSL for defining a basic address book.

PJ Hagerty
A look at some of the ways you can get involved with contributing directly to MRI. (To add my own advice, spend time exploring the MRI code base first.)

In brief