<https://stackoverflow.com/questions/65397653/is-t...

# announcements

[dmcg]

https://stackoverflow.com/questions/65397653/is-there-a-standard-kotlin-function-for-splitting-a-sequence-into-a-head-and-a-t

[nanodeath]

don't think so

[nanodeath]

while Kotlin has a decent amount of functional programming things, I think this is even further into LISP territory, which is probably underrepresented

[nanodeath]

did you want help with the implementation or no?

[dmcg]

My current stab is

private fun <T> Sequence<T>.destruct(): Pair<T, Sequence<T>>? {
    val iterator = this.iterator()
    return if (!iterator.hasNext())
        null
    else
        iterator.next() to Sequence { iterator }
}

[nanodeath]

yeah mine's basically the same

destruct.kt

[dmcg]

I was a bit surprised not to find it, which makes me wonder if it is a bad idea, but I need to take the header of a CSV list in a non-terminal sort of a way

[nanodeath]

I'd recommend using a CSV parsing library there, anyway

[dmcg]

It’s just for fun, I certainly don’t want to be dealing with all those horrible escaping rules!

[dmcg]

Thanks for the help - paste your answer into Stack Overflow for Internet points!

[nanodeath]

fair enough 🙂

[nanodeath]

oh, someone else posted a clever one-liner

[nanodeath]

though it does technically create two iterators...

[nanodeath]

I guess it returns the same iterator twice actually? anyway

[dmcg]

Hmm, I think it will fail if the sequence is constrainOnce, as both firstOrNull and drop are terminal