Ruby Rogues
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General Programming Practice
http://rosettacode.org/wiki/Main_Page
http://www.ia-contest.com/
http://projecteuler.net/
http://codility.com/
https://www.topcoder.com/
http://thecodelesscode.com/contents
http://robots.thoughtbot.com/post/159808605/coding-without-ifs
Anti If Campaign
http://codingbat.com/