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Add Iterator.nextOption #534

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Merged
merged 1 commit into from
Jun 2, 2022
Merged

Add Iterator.nextOption #534

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3 changes: 3 additions & 0 deletions compat/src/main/scala-2.11_2.12/scala/collection/compat/PackageShared.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -348,6 +348,9 @@ class IteratorExtensionMethods[A](private val self: c.Iterator[A]) extends AnyVa
def sameElements[B >: A](that: c.TraversableOnce[B]): Boolean = {
self.sameElements(that.iterator)
}
def nextOption(): Option[A] = {
if (self.hasNext) Some(self.next()) else None
}
def concat[B >: A](that: c.TraversableOnce[B]): c.TraversableOnce[B] = self ++ that
def tapEach[U](f: A => U): c.Iterator[A] = self.map(a => { f(a); a })
}
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8 changes: 8 additions & 0 deletions compat/src/test/scala/test/scala/collection/CollectionTest.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,14 @@ class CollectionTest {
assertEquals((Seq("bar", "baz"), Seq("foo".length, "test".length)), res)
}

@Test
def nextOption(): Unit = {
val it = Iterator(1, 2)
assertEquals(Some(1), it.nextOption())
assertEquals(Some(2), it.nextOption())
assertEquals(None, it.nextOption())
}

@Test
def tapEach(): Unit = {
var count = 0
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