Calling Optional.map(foo -> foo.bar) is effectively equivalent to foo?.bar in Kotlin. What GP was saying is that the author is using things like parseInt and ot

Calling Optional.map(foo -> foo.bar) is effectively equivalent to foo?.bar in Kotlin. What GP was saying is that the author is using things like parseInt and other non-idiomatic things because the author is not familiar enough with the language. Even if it weren't about parseInt vs toInt, the author could have used "number?.let(Integer::parseInt)" instead of "number?.let { Integer.parseInt(it) }" (but of course "number?.toInt()" is the idiomatic way to convert a nullable string to a nullable int).