package main

/**
 * Created by ice1000 on 2017/4/27.
 *
 * @author ice1000
 */

fun <A, B, C : Any> zipWith(op: (A, B) -> C) = { x: Sequence<A> ->
	{ y: Sequence<B> ->
		val iX = x.iterator()
		val iY = y.iterator()
		generateSequence {
			if (iX.hasNext() and iY.hasNext()) op(iX.next(), iY.next())
			else null
		}
	}
}

fun <T : Any> generate() = zipWith { x: Int, y: T -> "[$y * x^$x]" } (
	generateSequence(0, Int::inc)
)

fun main(args: Array<String>) =
		generate<Int>()(sequenceOf(1, 1, 2, 3, 5, 8, 13, 21)).forEach(::println)