From: Bernard Lambeau <blambeau@...>
Date: 2011-07-13T04:58:57+09:00
Subject: [ANN] summaryse 1.1.0 Released

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summaryse version 1.1.0 has been released!

sudo gem summaryse

After birthday yesterday, I already reached a second milestone. A lot
of useful features added for fun and profit! Examples are given in the
changelog exerpt below.

Array#summaryse

* <http://github.com/blambeau/summaryse>
* <http://rubydoc.info/github/blambeau/summaryse/master/frames>

Summarize arrays with full power. As a side effect, this gem allows merging
multiple YAML configuration files with power, without sacrifying
simplicity...

Changes:

# 1.1.0 / 2011.07.12

  * Added a way to register user-defined aggregation functions:

        Summaryse.register(:comma_join) do |ary|
          ary.join(', ')
        end
        [1, 4, 12, 7].summaryse(:comma_join)
        # => "1, 4, 12, 7"

  * Added the ability to specify aggregations on hash keys that are not used
at
    all. In this case, the aggregator is called on an empty array.

        [
          { :size => 12 },
          { :size => 17 }
        ].summaryse(:size => :max, :hobbies => lambda{|a| a})
        # => {:size => 17, :hobbies => []}

  * Added the ability to use objects responding to to_summaryse as
aggregator
    functions:

        class Foo
          def to_summaryse; :sum; end
        end
        [1, 2, 3].summaryse(Foo.new)
        # => 6

  * Added the ability to explicitly bypass Hash entries as the result of a
    computation, by returning Summaryse::BYPASS

        [
          { :hobbies => [:ruby],  :size => 12 },
          { :hobbies => [:music], :size => 17 }
        ].summaryse(:size => :max, :hobbies => lambda{|a|
Summaryse::BYPASS})
        # => {:size => 17}

  * The semantics of aggregating empty arrays is guaranteed. Due to duck
typing,
    nil is returned in almost all cases except :count so far. This is
specified
    in README.

  * Best-effort for yielding friendly hash ordering under ruby >= 1.9

  * Array#summaryse now raises an ArgumentError when it does not understand
its
    aggregator argument.

Enjoy!
B

-- 
PhD Student, Computer Science Department, EPL/INGI, UCLouvain, Belgium
Mail:    blambeau@gmail.com
Mobile:  +32 477 24 58 61
Blog:    http://revision-zero.org/
Code:    http://github.com/blambeau/
Follow:  http://twitter.com/blambeau/

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