fun toMap(): Map<String, Double> = mapOf("key" to nullableDouble1, "key2" to nullableDouble2).filterValues { it != null }

complains that "expected

Map<String, Double>

but found `Map<String, Double?>`". Is there an easy way around this other than appending

as Map<String, Double>

?

You can do something like

.entries.mapNotNull { (k,v) -> v?.let {k to v}  }.toMap()

I solved it by adding

.mapValues { it.value ?: 0.0 }

at the end

Maybe

.mapValues { it!! }

is safer.

I hate having

!!

in kotlin code

Then put the propesed function somewhere in your codebase.

?: 0

just hides the issue and you're back to not actually having null safety.

yeah, but I just removed all null values in the filter statement before that

Yeah, and

.mapValues { it!! }

is a safer dummy that will throw if someone ever changes the map call.

good point

😄 nope 🙂