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diff --git a/src/Collections/TraversableUtilities.php b/src/Collections/TraversableUtilities.php
new file mode 100644
--- /dev/null
+++ b/src/Collections/TraversableUtilities.php
@@ -0,0 +1,27 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Collections;
+
+use Countable;
+use TypeError;
+
+class TraversableUtilities {
+
+ public static function count ($countable) : int {
+ if (is_array($countable)) {
+ return count($countable);
+ }
+
+ if ($countable instanceof Countable) {
+ return $countable->count();
+ }
+
+ if ($countable === null || $countable === false) {
+ return 0;
+ }
+
+ throw new TypeError;
+ }
+
+}
diff --git a/tests/Collections/TraversableUtilitiesTest.php b/tests/Collections/TraversableUtilitiesTest.php
new file mode 100644
--- /dev/null
+++ b/tests/Collections/TraversableUtilitiesTest.php
@@ -0,0 +1,55 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Tests\Collections;
+
+use Keruald\OmniTools\Collections\TraversableUtilities;
+use PHPUnit\Framework\TestCase;
+
+use Countable;
+
+class TraversableUtilitiesTest extends TestCase {
+
+ /**
+ * @dataProvider provideCountables
+ */
+ public function testCount ($expectedCount, $countable) {
+ $this->assertEquals(
+ $expectedCount, TraversableUtilities::count($countable)
+ );
+ }
+
+ /**
+ * @dataProvider provideNotCountables
+ */
+ public function testCountWithNotCountables ($notCountable) {
+ $this->expectException("TypeError");
+ TraversableUtilities::count($notCountable);
+ }
+
+ ///
+ /// Data providers
+ ///
+
+ public function provideCountables () : iterable {
+ yield [0, null];
+ yield [0, false];
+ yield [0, []];
+ yield [3, ["a", "b", "c"]];
+ yield [42, new class implements Countable {
+ public function count () : int {
+ return 42;
+ }
+ }
+ ];
+ }
+
+ public function provideNotCountables () : iterable {
+ yield [true];
+ yield [new \stdClass];
+ yield [0];
+ yield [""];
+ yield ["abc"];
+ }
+
+}

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