Ruby custom functions that could be useful

functions.rb

    ### For when you want to round up/down in custom increments of any number x (rather than just floating point rounding up to whole number)
    
    # round_up(5, 20) -> 20
    # round_up(35,20) -> 40
    def round_up(num, round_by)
      (num / round_by.to_f).ceil * round_by
    end

    # round_down(5, 20) -> 0
    # round_up(35, 20) -> 20
    def round_down(num, round_by)
      (num / round_by) * round_by
    end