Rack is the basis for most major web frameworks in Ruby (like Ruby on Rails.) This video gives a basic overview on how it is used and what features make it a powerful component for Ruby Web Frameworks
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Ruby uses special characters to define certain data types. If you wish to use these characters in your data types, you need to escape them or use percent functions.
Percent functions are much simpler.
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Are you new to Ruby and want to get a head start? In this screencast, I discuss some of the most common methods and techniques that have to do with strings, arrays and hashes. This is also excellent for those coming from other languages.