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• List.kt

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app.cash.quiver.extensions.List.kt Maven / Gradle / Ivy

package app.cash.quiver.extensions

import arrow.core.Either
import arrow.core.Option
import arrow.core.filterOption
import arrow.core.raise.either

/**
 * Returns a list without Nones
 */
fun  List>.filterNotNone(): List = filterOption()

/**
 * Constructs a flattened list without Nones
 */
fun  listOfSome(vararg elements: Option): List = elements.toList().filterNotNone()

/**
 * Returns a list containing only the non-None results of applying the given transform function
 * to each element in the original collection.
 */
inline fun  List.mapNotNone(f: (A) -> Option): List =
  this.flatMap { f(it).fold(::emptyList, ::listOf) }