I need a function that takes a Decimal (it’s money, so two decimal places) and rounds up to the nearest quarter. I’m trying to avoid converting to floats and staying within the Decimal world. This function works, but it is hideous. The decimal library only natively supports rounding to the whole …

[image] markdev: it’s money, so two decimal places You may consider using money then.

Hello. It was a nice brain teaser. It took me a while to get it right but I think it works. defmodule Test do @roundings Enum.map(~w(00.0 0.25 0.50 0.75 1.00), &Decimal.new/1) def round_up_to_nearest_quarter(preroundedamount) do base = Decimal.round(preroundedamount, 0, :floor) frac = …

I discovered an even easier way to do it: multiply by 4, round up, and div back by 4. rounded = n |> Decimal.mult(4) |> Decimal.round(0, :up) |> Decimal.div(4)

Elixir Programming Language Forum

Rounding with Decimal library

Questions & Help Questions

markdev May 2, 2018, 6:17pm 3

I still don’t see a configurable rounding function in Money