Equivalent to the conditional or ternary operator in Kotlin

Kotlin does not have a ternary operator but a if can return a value (ie it is treated as an expression) and works the same way, with detail is you are required to have a block else . As stated in documentation :

  

In Kotlin, if it 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.

If any of the blocks has more than one statement the last will be considered the return.

There are no ternary expressions proper in Kotlin (until the tual version).

I think the closest to the ternary in Kotlin would be this:

val max = if (a > b) a else b

There are also other implementations described in this SOEN question .

In Kotlin these structures are used as expressions tb:

Log.wtf(GOT, if(valirianSteel == 0 && glassOfDragon==0) "Run!" else "Run too!");

Just to complement, in version 1.1 came the takeIf extension, which together with elvis operator ( ?: ) can contribute in this case.

Your expression would look like:

Log.wtf(GOT, "Run!".takeIf { valirianSteel == 0 && glassOfDragon==0 } ?: "Run too!")

It's a bit different from the usual case if you're tired of the default if / else.