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ChangeLog.md

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0.5.0 / 2024-01-25

  • Require ruby >= 2.0.0.
  • Switched to using require_relative to improve load-times.
  • Added # frozen_string_literal: true to all files.

0.4.4 / 2022-01-16

  • Fixed a bug in {Combinatorics::Choose.cardinality} for when 0 is given and 0 was returned instead of 1.

0.4.3 / 2012-05-28

  • Fixed a typo in the gemspec, which incorrectly set required_rubygems_version to the same value as required_ruby_version.

0.4.2 / 2012-05-27

  • Avoid warnings on JRuby by checking for ::Generator before ::Enumerator::Generator in combinatorics/generator.
  • Raise a NameError when the Generator class cannot be found in combinatorics/generator.
  • Replaced ore-tasks with rubygems-tasks.

0.4.1 / 2011-10-15

  • Fixed a typo in the gemspec.

0.4.0 / 2011-10-15

  • Added {Math.sigma}.
  • Added {Math.pi}.
  • Added {Math.factorial}.
  • Added {Math.subfactorial}.
  • Added {Combinatorics::CartesianProduct}.
  • Added {Combinatorics::Choose}.
  • Added {Combinatorics::Derange}.
  • Added {Combinatorics::Permute}.
  • Added {Combinatorics::PowerSet}.

0.3.1 / 2010-10-26

  • Do not call enum_for on Enumerator objects passed to {Array#comprehension}.
  • Improved {Array#comprehension} benchmarks.
  • Added [benchmark results] (see {file:Benchmarks.md}).

0.3.0 / 2010-10-17

  • Added {Combinatorics::Generator} which auto-detects the Generator class.

  • Added {Combinatorics::Enumerator} which auto-detects the Enumerator class.

  • Better detection of when enumerable values passed to {Array#comprehension} reach their last value. This allows using Generator objects that yield different values for each cycle:

    multiplier = 0
gen = Generator.new { |g|
  multiplier += 1
  5.times { |i| g.yield (i * multiplier) }
}

[[1,2], gen].comprehension.to_a
# => [[1,0],[1,1],[1,2],[1,3],[1,4],[2,0],[2,2],[2,4],[2,6],[2,8]]

  • Added a benchmark for {Array#comprehension} (see the benchmarks directory).

0.2.0 / 2010-10-03

  • Added {Range#&}.
  • Added {Range#upto}.
  • Added {Range#downto}.

0.1.0 / 2010-10-02

  • Initial release:
    • Adds powerset to {Array} and {Set}.
    • Adds Haskell/Python style list comprehensions via {Array#comprehension}.