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add minOption, maxOption, minByOption and maxByOption #345

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Sep 3, 2020
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Original file line number Diff line number Diff line change
Expand Up @@ -256,6 +256,34 @@ class IteratorExtensionMethods[A](private val self: c.Iterator[A]) extends AnyVa

class TraversableOnceExtensionMethods[A](private val self: c.TraversableOnce[A]) extends AnyVal {
def iterator: Iterator[A] = self.toIterator

def minOption[B >: A](implicit ord: Ordering[B]): Option[A] = {
if (self.isEmpty)
None
else
Some(self.min(ord))
}

def maxOption[B >: A](implicit ord: Ordering[B]): Option[A] = {
if (self.isEmpty)
None
else
Some(self.max(ord))
}

def minByOption[B](f: A => B)(implicit cmp: Ordering[B]): Option[A] = {
if (self.isEmpty)
None
else
Some(self.minBy(f)(cmp))
}

def maxByOption[B](f: A => B)(implicit cmp: Ordering[B]): Option[A] = {
if (self.isEmpty)
None
else
Some(self.maxBy(f)(cmp))
}
}

class TraversableExtensionMethods[A](private val self: c.Traversable[A]) extends AnyVal {
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