Ruby 2.0.0 Official Released

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From the official Ruby language website:
We are pleased to announce the release of Ruby 2.0.0-p0.
Ruby 2.0.0 is the first stable release of the Ruby 2.0 series, with many new features and improvements in response to the increasingly diverse and expanding demands for Ruby.
Enjoy programming with Ruby 2.0.0!
Some of the features include:
  • Language core features
    • Keyword arguments, which give flexibility to API design
    • Module#prepend, which is a new way to extend a class
    • A literal %i, which creates an array of symbols easily
    • __dir__, which returns the dirname of the file currently being executed
    • The UTF-8 default encoding, which make many magic comments omissible
  • Built-in libraries
    • Enumerable#lazy and Enumerator::Lazy, for (possibly infinite) lazy stream
    • Enumerator#size and Range#size, for lazy size evaluation
    • #to_h, which is a new convention for conversion to Hash
    • Onigmo, which is a new regexp engine (a fork of Oniguruma)
    • Asynchronous exception handling API
  • Debug support
    • DTrace support, which enables run-time diagnosis in production
    • TracePoint, which is an improved tracing API
  • Performance improvements
    • GC optimization by bitmap marking
    • Kernel#require optimization which makes Rails startup very fast
    • VM optimization such as method dispatch
    • Float operation optimization
And it's promised that compatibility between 1.9 and 2.0 is going to be better than even from 1.8 to 1.9!

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