Replacing a Complex Regular Expression with a Simple Parser
Replacing a Complex Regular Expression with a Simple Parser By Starr Horne #ruby Jun 27, 2017 Confession time: I don't particularly like working with regular expressions. While I use them all the time, anything more complex than a /^foo.*$/ requires me to stop and think. While I'm sure there are people who can decipher expressions like \A(?=\w{6,10}\z)(?=[^a-z]*[a-z])(?=(?:[^A-Z]*[A-Z]){3}) at a g
Unicode Normalization in Ruby
I recently published an article in which I tested most of Ruby's string methods with certain Unicode characters to see if they would behave unexpectedly. Many of them did. One criticism that a few people had of the article was that I was using unnormalized strings for testing. Frankly, I was a bit fuzzy on Unicode normalization. I suspect that many Rubyists are. Using normalization, you can take m
Testing Ruby's Unicode Support
Among the new features shipped with Ruby 2.4 is improved Unicode support. Specifically, methods like upcase and downcase work as expected, turning "ä" to "Ä" and back. This made me curious: what other Unicode improvements have been made since 2013 when I read André Arko's blog post Strings in Ruby are UTF-8 now… right?? I tested all of Ruby's string methods, not looking for technical errors but
Common Rails Idioms that Kill Database Performance
Many of the most common ActiveRecord idioms produce SQL which doesn't scale well as your dataset gets larger. In this article I discuss three of the worst offenders and offer work-arounds. I remember the first time I saw rails' ActiveRecord. It was a revelation. This was back in 2005 and I was hand-coding SQL queries for a PHP app. Suddenly, using the database went from being a tedious chore, to b
Ruby's case statement - advanced techniques
Nothing could be simpler and more boring than the case statement. It’s a holdover from C. You use it to replace a bunch of ifs. Case closed. Or is it? Actually, case statements in Ruby are a lot richer and more complex than you might imagine. Let’s take a look. Nothing could be simpler and more boring than the case statement. It's a holdover from C. You use it to replace a bunch of ifs. Case close
When to use freeze and frozen? in Ruby
When to use freeze and frozen? in Ruby By Starr Horne #ruby Sep 2, 2015 These days it's pretty common to see #freeze used in Ruby code. But it's often not entirely clear WHY freeze is being used. In this post we'll look at the most common reasons a developer might freeze variables. To illustrate each reason, I've excerpted example code from the Rails codebase and other popular open-source projects
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RubyLetter - Shared Libraries: How Ruby and C Work Together
Objects as Ruby Hash Keys
A Rubyist's Guide to Big-O Notation
