I don't know for sure if it will box them or not, ...

# getting-started

[dalexander]

I don't know for sure if it will box them or not, but I would guess it would. My comment about performance was because the you are probably doing a null check in the else case which wouldn't exist with a regular val v = if() {} else {} construct. So it would look like val v = (if(bool) {trueResult} else {null}) ?: {falseResult} which I suspect doesn't get optimized away.