/**
* @param callable $callable
* @return SetInterface
*/
public function flatMap(callable $callable)
{
$newElements = new Set();
foreach ($this->elements as $i => $element) {
$newElements->addAll($callable($element));
}
return $newElements;
}
public function testTail()
{
$this->set->addAll(['foo', 'bar', 'baz', 'boo']);
$this->assertEquals('bar', $this->set->tail()->headOption()->get());
}
