Kotlin and idiomatic way to write, 'if not null, else…' based around mutable value

Question

Suppose we have this code:

class QuickExample {

    fun function(argument: SomeOtherClass) {
        if (argument.mutableProperty != null ) {
            doSome         


        

Answer 1

add custom inline function as below:

inline fun  T?.whenNull(block: T?.() -> Unit): T? {
    if (this == null) block()
    return this@whenNull
}

inline fun  T?.whenNonNull(block: T.() -> Unit): T? {
    this?.block()
    return this@whenNonNull
}

then you can write code like this:

var nullableVariable :Any? = null
nullableVariable.whenNonNull {
    doSomething(nullableVariable)
}.whenNull {
    doOtherThing()
}