frwera.blogg.se - Kotlin nullable string

Boolean check for whether a nullable string is null or blank in Kotlin.

How to convert this java code with null condition check into Kotlin.

Kotlin multiplication between nullable and non-nullable float errors even with null check.

Kotlin null check with !! does not short-circuit evaluation?.

Which then again can be used within the listOfNotNull. Assuming something like the following as data class: data class Location(val line1 : String?, val line2 : String?, val line3part1 : String?, val line3part2 : String?)Ī possible usage of listOfNotNull assuming that empty lines should not be printed could like: with(yourLocation)

Now regarding your update of the question. If instead you just wanted to concatenate a list of strings which may or may not contain null values, you may also be interested in something like the following: listOfNotNull(foo, bar).joinToString(" ") If it is ok if null is printed, I just keep it as is, i.e. If I need a default value, I go with foo ?: "". Counterquestions: what do you want to append instead? and what is your preference?