Round to nearest 5 minutes in ruby, strangely this wasn't super simple to come up with..

round_nearest_5.rb

def self.round_to_five_minutes(minute)
    all = [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55]
    higher = nil
    lower = nil
    all.each_with_index do |five_min,index|
      if minute == five_min
        return five_min
      end
      if five_min > minute
        higher = five_min
        lower = all[index-1]
        break
      end
    end
    diff_lower = minute-lower
    diff_higher = higher-minute
    diff_lower > diff_higher ? higher : lower
  end