IterableOnceExtension

flatgraph.traversal.IterableOnceExtension

final class IterableOnceExtension[A](val iterable: IterableOnce[A]) extends AnyVal

Attributes

See also

loneElement(hint)

Returns: the one and only element from an Iterable
Throws: AssertionError
if the Iterable has more than one element

NoSuchElementException
if the Iterable is empty

Returns

Some(element)

if the Iterable has exactly one element, or

None

if the Iterable has zero or more than 1 element. Note: if the lone element is

null

, this will return

Some(null)

, which is in accordance with how

headOption

works.

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