Quick and Dirty Scan function in Kotlin

scan.kt

fun <T> List<T>.scan(fn: (T, T) -> T): List<T> {
    return if (this.isEmpty()) this
    else this.drop(1).fold(listOf(this.first()), { acc, item ->
        acc.plus(fn(acc.last(), item))
    })
}

println((1..5).toList().scan { x, y -> x + y })