you can only seperate declaration and initilization if the latter happens in a constructor or

init

block. in the end they wont be split this way. you can use

by lazy{}

with `val`s

Is there a way, using lateinit to ensure that the variable is set just once?

For a local variable compiler will make sure that variable is initialized only once and that it is not used before initialization and will show compiler error otherwise. For a property that is initialized in some method such check is impossible in a common case. As @thana mentioned, if you make initialization in a constructor, then compiler will be able to make a check, so

lateinit

will not be needed.

when using a

val

with the

lazy

delegate the property will be written once and only once

Only when it's accessed the first time. Awesome, thanks!

You could also write a simple delegate for this,

var foo by setOnce()

or something.