Basic Kotlin question here. If I wanted to move t...

# announcements

[Twferrell]

Basic Kotlin question here. If I wanted to move the decimalPrecision into the when (for example when(decimalPrecision)), is there a way I can still compare the value against <= 0 ?

[Ryan]

https://kotlinlang.org/docs/reference/control-flow.html

[Ryan]

you can overload method x.isNegative -> do shit

[Twferrell]

But it would allow me to do the isNegative as one of the conditions inside the when block?

[Twferrell]

I was trying to use a function there, but didnt' seem to work

[Twferrell]

For example

[Twferrell]

When I do this...

[Twferrell]

image.png

[Twferrell]

I can get by with that since the decimalPrecision allows comparison against each "constant"

[Twferrell]

But one of those branches can't be <= 0

[Twferrell]

https://discuss.kotlinlang.org/t/when-with-less-than/2345/14

[Twferrell]

I found this article

[Twferrell]

Guess it's not supported.

[Twferrell]

🙂

[Michael de Kaste]

"OpenRanges" are not officially supported yet, however, you can write one yourself. you can then do:

when(decimalPrecision){
    in <http://OpenRange.To|OpenRange.To>(0) -> "0%"
    null -> "0.00%"
    else -> ...
}

In our application, we use openranges for dates. We use codelists to indicate whether or not a code is active or not from a startDate until an endDate. However, sometimes, endDates are not filled in yet, indicating that the code will last forever.

[Michael de Kaste]

I wish we could make constructors like this:

..=0 "from -infinite until including 0"
...0 "from -infinite until excluding 0"
0=.. "from 0 including until infinity"
0... "from 0 excluding until infinity"

a man can dream