Contents

module Array::Average
  def avg
    return 0 if empty?

    sum = inject(0) { |s, i| s + i }

    avg = sum / length
    return avg if length * avg == sum
    sum * 1.0 / length
  end
end

class Array
  include Average
end

module Array::Average::Etest
  def test_avg
    assert_equal(1, [ 1 ].avg)
    assert_equal(2, [ 1, 3 ].avg)
    assert_equal(0, [ ].avg)
  end
end

Version data entries

8 entries across 8 versions & 1 rubygems

Version	Path
vex-0.3.3	lib/vex/base/array/avg.rb
vex-0.2.9	lib/vex/base/array/avg.rb
vex-0.2.8	lib/vex/base/array/avg.rb
vex-0.2.7	lib/vex/base/array/avg.rb
vex-0.2.6	lib/vex/base/array/avg.rb
vex-0.2.5	lib/vex/base/array/avg.rb
vex-0.2.2	lib/vex/base/array/avg.rb
vex-0.2.1	lib/vex/base/array/avg.rb