ActiveSupport is a Rails library containing utility classes and extensions to Ruby’s built-in libraries. It usually doesn’t get much attention on its own—you might even call its modules the supporting cast members of the Rails ensemble.
ActiveSupport’s low profile doesn’t diminish its importance in day-to-day Rails programming. To ensure that this book is 100 percent useful as a programming companion, here is a complete, enhanced version of the Rails
ActiveSupport API reference, supplemented where appropriate with real-life example usages and commentary.
Direct extensions of Ruby classes and modules are listed under headings according to class or module name. Extensions made via mixin module appear ...