TraversableUtilities.php
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TraversableUtilities.php
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	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\Collections;

	use Countable;
	use InvalidArgumentException;
	use ResourceBundle;
	use SimpleXMLElement;
	use TypeError;

	class TraversableUtilities {

	public static function count ($countable) : int {
	if (is_countable($countable)) {
	return count($countable);
	}

	if ($countable === null \|\| $countable === false) {
	return 0;
	}

	throw new TypeError;
	}

	public static function first (iterable $iterable) : mixed {
	foreach ($iterable as $value) {
	return $value;
	}

	throw new InvalidArgumentException(
	"Can't call first() on an empty iterable."
	);
	}

	public static function firstOr (
	iterable $iterable, mixed $defaultValue = null
	) : mixed {
	foreach ($iterable as $value) {
	return $value;
	}

	return $defaultValue;
	}

	}