safe call question on nullable variable: Let’s sa...

# announcements

[wei]

safe call question on nullable variable:
Let’s say I have a variable of type List<String>? and I want to check that it contains at least one element. Is it possible to use just one condition check? I’ve tried:

val t: List<String>? = null
println(t?.size != 0)

and this prints true, which is not what I want.
I tried: !t?.size?.equals(0) but I can’t use this in an if because it’s Boolean?.

[Andreas Sinz]

t?.isEmpty() ?: true

[wei]

👍

[Andreas Sinz]

or in your case t?.isNotEmpty() ?: false returns true if the list exists and has at least one element