does kotlin have a way to turn a function into one...

# announcements

[robstoll]

does kotlin have a way to turn a function into one which is evaluated only once?
Something like

fun <R> (() -> R).evalOnce(): () -> R {
    val v by lazy { this() }
    return { v }
}

but which works also for functions with one or more parameters?

[poohbar]

Do you mean memoization?

[robstoll]

kind of yes

[jlleitschuh]

Well part of the memoization would involve making sure that the parameters matched a previous call. You'd probably have to roll your own on this one.

[spand]

It seems you want a cache

[robstoll]

ok, thanks for the information

[diego-gomez-olvera]

https://medium.com/@JorgeCastilloPr/kotlin-purity-and-function-memoization-b12ab35d70a5

[jlleitschuh]

If you want to make this generic, I'd suggest that you make your memoization function, a simple way to get around the multi-argument problem is just make a version of the function that takes one arg and when you need more args, throw those into a data class.