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kotlinlang

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 <@UFC7B9QPM> 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.