Migration guide for Ruby from RHEL 6 to 7
Updated -
Changes in Language and Standard Library
Changes from Ruby 1.8.7 to 2.0.0 are significant; namely in performance, unicode support and threading.
Bellow is the list of changes introduced in major version of Ruby released in the meantime.
Changes in Ruby 1.9.x
Ruby 1.9 brought a lot of changes to Ruby and introduced quite a few incompatibilities against Ruby 1.8.7...
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