public function testMap()
{
$functor = Funktion(function ($value) {
return $value * 2;
});
$this->assertTrue(Arrays::isArray(Repeatables::map(self::getArray(), $functor)));
$this->assertTrue(Traversables::isTraversable(Repeatables::map(self::getIterator(), $functor)));
$this->assertTrue(Traversables::isTraversable(Repeatables::map(self::getIteratorAggregate(), $functor)));
$repeatables = [self::getArray(), self::getIterator(), self::getIteratorAggregate()];
foreach ($repeatables as $repeatable) {
foreach (Repeatables::map($repeatable, $functor) as $key => $value) {
$this->assertEquals($repeatable[$key] * 2, $value);
}
}
}
public static final function first($repeatable) : OptionalInterface
{
if (self::isRepeatable($repeatable)) {
if (Arrays::isArray($repeatable)) {
return Arrays::first($repeatable);
}
if (Traversables::isTraversable($repeatable)) {
return Traversables::first($repeatable);
}
}
throw new \InvalidArgumentException(self::$MSG_ARGUMENT1_NOT_REPATABLE);
}