custom_max.rb

custom_max.rb

class Array
  def custom_max
    idx = self[0] > self[1] ? 1 : 0
    self.delete_at(idx)
    self.length <= 1 ? self[0] : self.custom_max
  end
end

a = [4,3,6,1,44,4,8,31,41,2,1,98,2,3,1,8,32,1,4,5,6]

puts a.custom_max.inspect
puts a.inspect #original array modificated

######################

puts "--------------- New Example ---------------"

class Array
  def custom_max
    @copy = self.dup unless defined?(@copy)
    idx = @copy[0] > @copy[1] ? 1 : 0
    @copy.delete_at(idx)

    if @copy.length <= 1
      max = @copy[0]
      @copy = self.dup

      max
    else
      self.custom_max
    end
  end
end

a = [4,3,6,1,44,4,8,31,41,2,1,98,2,3,1,8,32,1,4,5,6]

puts a.custom_max.inspect
puts a.inspect #original not modificated

puts a.custom_max
puts a.custom_max
puts a.custom_max

puts a.inspect