Is it idiomatic kotlin? ```val check = true when(...

# codereview

[Eugen Martynov]

Is it idiomatic kotlin?

val check = true

when(check) {
    true -> println("it's true")
    false -> println("it's false")
}

[Mike]

For a boolean, if is the more readable choice. When is better for completeness check on enum/sealed class, or those cases where your if has at least 3 branches.

[Eugen Martynov]

That was my assumptions, but is it common sence or written somewhere?

[Cody Engel]

I don't know if it's been written down anywhere but it's implied. One advantage of the language is being concise, using the when is not as concise as say...

if (check) println("it's true") else println("it's false")

[daphillips]

Kotlin's coding conventions mention it: https://kotlinlang.org/docs/reference/coding-conventions.html#if-versus-when