closed_last.rb

# Takes a collection of Stocks and moves the closed ones to the end
def closed_stocks_last(stocks)
  open, closed = [], []
  
  stocks.each do |stock|
    if stock.closed?
      closed << stock
    else
      open << stock
    end
  end
  
  open + closed
end

# I've found that doing:
stocks.sort_by { |s| s.closed? ? 1 : 0 }
# Does not preserve the original ordering, but using the method above does.