What is the name for each of these ways to referen...

# announcements

[Nezteb]

What is the name for each of these ways to reference a function?
::funcName
funcName
funcName()
?

The last one I believe is a function invocation, ie () -> Unit, but the first two confuse me.

[Alowaniak]

The first is a function reference
The second is only the name of the function, if that's already a variable pointing to a function then it's the same as the first I guess

[Czar]

function (or method) reference
function name
function invocation

[streetsofboston]

fun funcName() : Unit { ... }

::funcName is a function reference and can be cast easily to a lambda:

val funcRef : KFunction<Unit> = ::funcName // OK
val funcLambda : () -> Unit = ::funcName // OK
val givesCompileError: () -> Unit = funcRef // compiler error

funcName is not possible in Kotlin. This will give a syntax error. This syntax denootes either a value/variable, parameter, field, etc.

funcName() is calling the function, executing it, returning its return value.

// These do all the exact same
funcName()
funcRef.call()
funcLambda()

[Nezteb]

Sweet; thanks for all the info!