> > My primary target application domain for adoption of Elixir is > financial/logistics apps so being able to deal with currency and apply > certain rounding rules and such is pretty key. Floating point is the > devil when you do these things and most often you build something out > of integers and track significant logical decimal places. Not being > able to use these in guards is probably the most painful limit that I > perceive right now. >
The interesting thing is that, if you are dealing with money, you could maybe implement your own Money type, possibly inspired by Decimal, and provide sigils such as: ~m(10.00)USD And money would also guarantee that you don't apply operations to different currencies. When it comes to operations, we have mentioned multiple options: 1. Use regular functions as in Decimal: number1 |> D.add(number2) |> D.multiply(2) 2. Replace the current + and - and so on by operators that know how to use money or decimal. Such will make regular + and - operators slower but it is likely fine if you are applying it only to parts of your codebase. 3. Provide some sort of decimal evaluator: D.eval number1 + number2 * number3 My long term wish is to actually provide decimal with unit support in the standard library but, because we can't really make it really first class in the standard library (i.e. we can't support it in guards), I still personally feel it is better suited as a separated package. I would be open though to adding support for number sigils like 13.0d, 13.0f although we should also consider how numbers like rationals would play into that. -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. To unsubscribe from this group and stop receiving emails from it, send an email to elixir-lang-core+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4KPEW1CPv50Saji-r283xFaxwXTr2sRA10k72YgCsn%2BLQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
