array_enhancements.rb

module CoreExtensions
  module Array
    module Enhancements
      # a = [0, 1, 2, 3, 4]
      # a.splice(2, 1, *[9, 8, 7])
      # => [1, 2, 9, 8, 7, 4]
      def splice(start, len, *replace)
        self[start, len] = replace
        self
      end
      
      # a = [1, 2, 3, 4]
      # a.accumulate
      # => [1, 3, 6, 10]
      def accumulate
        # Don't coerce nils to zero with #to_i. Value may be a float or BigDecimal
        self.inject([]) { |cs, i| cs << (i || 0) + (cs.last || 0) }
      end
    end
  end
end

Array.include CoreExtensions::Array::Enhancements