Use of Boolean? in if expression
You can compare nullable boolean with true
, false
or null
using equality operator:
var b: Boolean? = null
if (b == true) {
// b was not null and equal true
}
if (b == false) {
// b is false
}
if (b != true) {
// b is null or false
}
If you want to cleanly check whether a Boolean?
is true
or false
you can do:
when(b) {
true -> {}
false -> {}
}
If you want to check if it's null
you can add that (or else
) as a value in the when
:
when(b) {
true -> {}
false -> {}
null -> {}
}
when(b) {
true -> {}
false -> {}
else-> {}
}