This looks like it is safe to use: 2.2.1 :001 > a = b = "hello world" "hello world" 2.2.1 :002 > a

Ruby has the class Proc which encapsulates a "block of code". There are 2 "flavors" of Procs: Those with "block...

This class contains nerdcore things such as disassembling a piece of Ruby into VM calls or enabling tail-call optimization...

Sometimes you just want to have a small web server that serves files to test something. Serve the current directory...

There are many solutions, but a very concise one is this: hash.merge!(hash) do |key, old_value, new_value|

Sometimes you want to know exactly how many objects exist within your running Ruby process. Here is how: stats = {} ObjectSpace.each...

This is basically Ruby-native syntax for andand.

Ruby has a set of methods to convert an object to another representation. Most of them come in explicit and...

When you make a simple TCP connection to a remote server (like telnet), your client won't normally notice when...

You want to test your 1GE or 10GE internet uplink? We needed to ensure we have full 10GE to the...

Ruby allows multiple assignment: a, b, c = o In order to prove multiple values from a single object, Ruby calls...

When a method has keyword arguments, Ruby offers implicit conversion of a Hash argument into keyword arguments. This conversion is...

Writing ruby methods that accept both optional and keyword arguments is dangerous and should be avoided. This confusing behavior will...

Starting with Rails 4.0, when you get an exception reported via the ExceptionNotification gem, you will only see a very...

Starting with Ruby 1.9, most #each methods can be called without a block, and will return an enumerator. This is...

To safely transport an arbitrary string within a URL, you need to percent-encode characters that have a particular meaning...

While debugging an intricate issue with failed HTTP requests I have come to appreciate the more advanced features of the...

Ruby has Enumerable.find(&block), which returns the first item in the collection for which the block evaluates to true.

To update your Rubygems to the latest available version, type the following: gem update --system Note that you have a...

On Ruby 1.9+, standard ruby character classes like \w, \d will only match 7-Bit ASCII characters: "foo" =~ /\w+/ # matches...

To check which rubygems versions your different rbenv rubys are using, you can use this small bash script:

CTRL + SHIFT + ALT + N Search for any symbol in your application, like CSS classes, Ruby classes, methods, helpers etc...

Very detailed guide to caching Ruby on Rails. Goes well with the official Rails guide on caching.