Kotlin equivalent of ternary operator [duplicate]

问题

This question already has answers here:

Kotlin Ternary Conditional Operator (28 answers)

Closed 3 years ago.

So in java we have the ternary operator (?), which sometimes is useful to easy some value computed by a if-else inlines. For example:

myAdapter.setAdapterItems(
            textToSearch.length == 0
            ? noteList
            : noteList.sublist(0, length-5)
)

I know the equivalent in kotlin would be:

myAdapter.setAdapterItems(
                if(textToSearch.length == 0)
                    noteList
                else
                    noteList.sublist(0, length-5) 
)

But i just used to love the ternary operator in Java, for short expression conditions, and when passing values to a method. Is there any Kotlin equivalent?

回答1:

There is no ternary operator in Kotlin.

https://kotlinlang.org/docs/reference/control-flow.html

In Kotlin, if is an expression, i.e. it returns a value. Therefore there is no ternary operator (condition ? then : else), because ordinary if works fine in this role.

You can find a more detailed explanation here.

来源：https://stackoverflow.com/questions/34935918/kotlin-equivalent-of-ternary-operator