NonEmptyList

import arrow.core.nonEmptyListOf
import arrow.core.toNonEmptyListOrNull

fun main() {
 println(nonEmptyListOf(1, 2, 3, 4, 5))
 println(listOf(1, 2, 3).toNonEmptyListOrNull())
 println(emptyList<Int>().toNonEmptyListOrNull())
}

NonEmptyList(1, 2, 3, 4, 5)
NonEmptyList(1, 2, 3)
null

import arrow.core.nonEmptyListOf

val value =
//sampleStart
 nonEmptyListOf(1, 2, 3, 4, 5).head
//sampleEnd
fun main() {
 println(value)
}

import arrow.core.NonEmptyList
import arrow.core.nonEmptyListOf

//sampleStart
fun sumNel(nel: NonEmptyList<Int>): Int =
 nel.foldLeft(0) { acc, n -> acc + n }
val value = sumNel(nonEmptyListOf(1, 1, 1, 1))
//sampleEnd
fun main() {
 println("value = $value")
}

import arrow.core.nonEmptyListOf

val value =
//sampleStart
 nonEmptyListOf(1, 1, 1, 1).map { it + 1 }
//sampleEnd
fun main() {
 println(value)
}

import arrow.core.NonEmptyList
import arrow.core.nonEmptyListOf

//sampleStart
val nelOne: NonEmptyList<Int> = nonEmptyListOf(1, 2, 3)
val nelTwo: NonEmptyList<Int> = nonEmptyListOf(4, 5)

val value = nelOne.flatMap { one ->
 nelTwo.map { two ->
   one + two
 }
}
//sampleEnd
fun main() {
 println("value = $value")
}

import arrow.core.NonEmptyList
import arrow.core.nonEmptyListOf
import arrow.core.zip
import java.util.UUID

//sampleStart
data class Person(val id: UUID, val name: String, val year: Int)

// Note each NonEmptyList is of a different type
val nelId: NonEmptyList<UUID> = nonEmptyListOf(UUID.randomUUID(), UUID.randomUUID())
val nelName: NonEmptyList<String> = nonEmptyListOf("William Alvin Howard", "Haskell Curry")
val nelYear: NonEmptyList<Int> = nonEmptyListOf(1926, 1900)

val value = nelId.zip(nelName, nelYear) { id, name, year ->
 Person(id, name, year)
}
//sampleEnd
fun main() {
 println("value = $value")
}