Ruby implementation of Trump Sort

trump_sort.rb

class TrumpSort
  def initialize(arr)
    @arr = arr
    @wall = nil
    @sorted = []
  end

  def sort
    @arr.each {|n| looper(n)}
    @sorted
  end

  def looper(n)
    if @wall.nil? || n > @wall
       @sorted << n
       @wall = n
    end
  end
  
  # or the entire thing as a class method
  def self.sort(arr)
    wall = nil
    [].tap do |a|
      arr.each do |n|
        if wall.nil? || n > wall
          wall = n
          a << n
        end
      end
    end
  end
end

Doing as an instance of TrumpSort and as a class method of TrumpSort.

Example:
arr = [1,3,2,5,4]
TrumpSort.new.sort(arr) & TrumpSort.sort(arr) both return [1,3,5]