new inject

New_inject.rb

class Array
  def new_inject(*default_value)
    if default_value == []
      total = self.first
      new_array = self.drop(1)
    else
      total = default_value[0]
      new_array = self
    end
    new_array.each do |element|
      total = yield(total, element)
    end
    total
  end
end


puts ["a", "b", "c"].new_inject { |i, j| i + j }
puts ["a", "b", "c"].new_inject("d") { |i, j| i + j }
puts [2,3,4,5].inject() { |i, j| i * j }
puts [2,3,4,5].new_inject() { |i, j| i * j }
puts [2,3,4,5].new_inject(10) { |i, j| i * j }