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	diff --git a/src/Collections/WithCollection.php b/src/Collections/WithCollection.php
	index 3b7c3ee..45baae3 100644
	--- a/src/Collections/WithCollection.php
	+++ b/src/Collections/WithCollection.php
	@@ -1,27 +1,100 @@
	<?php

	namespace Keruald\OmniTools\Collections;

	+use Keruald\OmniTools\Reflection\CallableElement;
	+
	+use InvalidArgumentException;
	use OutOfRangeException;

	trait WithCollection {

	abstract function count () : int;
	abstract function toArray() : array;

	public function first () : mixed {
	foreach ($this->toArray() as $item) {
	return $item;
	}

	throw new OutOfRangeException("The collection is empty.");
	}

	public function firstOr (mixed $default) : mixed {
	return match ($this->count()) {
	0 => $default,
	default => $this->first(),
	};
	}

	+ ///
	+ /// HOF
	+ ///
	+
	+ /**
	+ * Determines if at least an element of the collection satisfies a condition.
	+ *
	+ * The execution of callbacks stop after a callable returned true.
	+ *
	+ * @param callable $callable A method returning a boolean with key and value
	+ * or only value as arguments.
	+ *
	+ * @return bool True if callback is true for at least one of the elements
	+ * @throws \ReflectionException if the callable does not exist.
	+ */
	+ public function any (callable $callable) : bool {
	+ $argc = (new CallableElement($callable))->countArguments();
	+ $items = $this->toArray();
	+
	+ foreach ($items as $key => $value) {
	+ $result = match($argc) {
	+ 0 => throw new InvalidArgumentException(self::CB_ZERO_ARG),
	+ 1 => $callable($value),
	+ default => $callable($key, $value),
	+ };
	+
	+ // PHP standard or extensions functions can sometimes throw
	+ // mixed result, for example true or a constant. Any other
	+ // result than the boolean true is interpreted as falsy.
	+ if ($result === true) {
	+ return true;
	+ }
	+ }
	+
	+ return false;
	+ }
	+
	+ /**
	+ * Determines if all elements of the collection satisfies a condition.
	+ *
	+ * The execution of callbacks stop after a callable returned false.
	+ *
	+ * @param callable $callable A method returning a boolean with key and value
	+ * or only value as arguments.
	+ *
	+ * @return bool True if callback is true for all the elements
	+ * @throws \ReflectionException if the callable does not exist.
	+ */
	+ public function all (callable $callable) : bool {
	+ $argc = (new CallableElement($callable))->countArguments();
	+ $items = $this->toArray();
	+
	+ foreach ($items as $key => $value) {
	+ $result = match($argc) {
	+ 0 => throw new InvalidArgumentException(self::CB_ZERO_ARG),
	+ 1 => $callable($value),
	+ default => $callable($key, $value),
	+ };
	+
	+ // PHP standard or extensions functions can sometimes throw
	+ // mixed result, for example true or a constant. Any other
	+ // result than the boolean true is interpreted as falsy.
	+ if ($result !== true) {
	+ return false;
	+ }
	+ }
	+
	+ return true;
	+ }
	+
	}
	diff --git a/tests/Collections/HashMapTest.php b/tests/Collections/HashMapTest.php
	index 9529d66..4d39415 100644
	--- a/tests/Collections/HashMapTest.php
	+++ b/tests/Collections/HashMapTest.php
	@@ -1,528 +1,556 @@
	<?php

	namespace Keruald\OmniTools\Tests\Collections;

	use Keruald\OmniTools\Collections\BitsVector;
	use Keruald\OmniTools\Collections\HashMap;

	use PHPUnit\Framework\Attributes\DataProvider;
	use PHPUnit\Framework\TestCase;

	use InvalidArgumentException;
	use IteratorAggregate;
	use OutOfRangeException;
	use Traversable;

	class HashMapTest extends TestCase {

	///
	/// Test set up
	///

	private HashMap $map;

	const MAP_CONTENT = [
	// Some sci-fi civilizations and author
	"The Culture" => "Iain Banks",
	"Radchaai Empire" => "Ann Leckie",
	"Barrayar" => "Lois McMaster Bujold",
	"Hainish" => "Ursula K. Le Guin",
	];

	protected function setUp () : void {
	$this->map = new HashMap(self::MAP_CONTENT);
	}

	///
	/// Constructors
	///

	public function testConstructorWithArray () {
	$this->assertSame(self::MAP_CONTENT, $this->map->toArray());
	}

	public function testConstructorWithTraversable () {
	$expected = [
	"color" => "blue",
	"material" => "glass",
	"shape" => "sphere",
	];

	$iterable = new class implements IteratorAggregate {
	function getIterator () : Traversable {
	yield "color" => "blue";
	yield "material" => "glass";
	yield "shape" => "sphere";
	}
	};

	$map = new HashMap($iterable);
	$this->assertSame($expected, $map->toArray());
	}

	public static function provideDeepArrays() : iterable {
	yield [self::MAP_CONTENT, self::MAP_CONTENT];

	yield [[], []];
	yield [null, []];

	$caps = new \stdClass;
	$caps->color = "red";
	$caps->logo = "HCKR";
	yield [$caps, [
	"color" => "red",
	"logo" => "HCKR",
	]];

	$sizedCaps = clone $caps;
	$sizedCaps->size = new \stdClass;
	$sizedCaps->size->h = 8;
	$sizedCaps->size->r = 20;
	yield [$sizedCaps, [
	"color" => "red",
	"logo" => "HCKR",
	"size" => ["h" => 8, "r" => 20],
	]];
	}

	#[DataProvider('provideDeepArrays')]
	public function testFrom($from, array $expected) : void {
	$map = HashMap::from($from);
	$this->assertEquals($expected, $map->toArray());
	}

	///
	/// Getters and setters
	///

	public function testGet () {
	$this->assertSame("Iain Banks", $this->map->get("The Culture"));
	}

	public function testGetWhenKeyIsNotFound () {
	$this->expectException(InvalidArgumentException::class);

	$this->map->get("Quuxians");
	}

	public function testGetOr () {
	$actual = $this->map
	->getOr("The Culture", "Another author");

	$this->assertSame("Iain Banks", $actual);
	}

	public function testGetOrWhenKeyIsNotFound () {
	$actual = $this->map
	->getOr("Quuxians", "Another author");

	$this->assertSame("Another author", $actual);
	}

	public function testSetWithNewKey () {
	$this->map->set("Thélème", "François Rabelais");

	$this->assertSame("François Rabelais",
	$this->map->get("Thélème"));
	}

	public function testSetWithExistingKey () {
	$this->map->set("The Culture", "Iain M. Banks");

	$this->assertSame("Iain M. Banks",
	$this->map->get("The Culture"));
	}

	public function testUnset() {
	$this->map->unset("The Culture");
	$this->assertFalse($this->map->contains("Iain Banks"));
	}

	public function testUnsetNotExistingKey() {
	$this->map->unset("Not existing");
	$this->assertEquals(4, $this->map->count());
	}

	public function testHas () {
	$this->assertTrue($this->map->has("The Culture"));
	$this->assertFalse($this->map->has("Not existing key"));
	}

	public function testContains () {
	$this->assertTrue($this->map->contains("Iain Banks"));
	$this->assertFalse($this->map->contains("Not existing value"));
	}

	///
	/// Collection method
	///

	public function testCount () {
	$this->assertSame(4, $this->map->count());
	}

	public function testClear () {
	$this->map->clear();
	$this->assertSame(0, $this->map->count());
	}

	public function testIsEmpty () : void {
	$this->map->clear();

	$this->assertTrue($this->map->isEmpty());
	}

	public function testMerge () {
	$iterable = [
	"The Culture" => "Iain M. Banks", // existing key
	"Thélème" => "François Rabelais", // new key
	];

	$expected = [
	// The original map
	"The Culture" => "Iain Banks", // Old value should be kept
	"Radchaai Empire" => "Ann Leckie",
	"Barrayar" => "Lois McMaster Bujold",
	"Hainish" => "Ursula K. Le Guin",

	// The entries with a new key
	"Thélème" => "François Rabelais",
	];

	$this->map->merge($iterable);
	$this->assertSame($expected, $this->map->toArray());
	}

	public function testUpdate () {
	$iterable = [
	"The Culture" => "Iain M. Banks", // existing key
	"Thélème" => "François Rabelais", // new key
	];

	$expected = [
	// The original map
	"The Culture" => "Iain M. Banks", // Old value should be updated
	"Radchaai Empire" => "Ann Leckie",
	"Barrayar" => "Lois McMaster Bujold",
	"Hainish" => "Ursula K. Le Guin",

	// The entries with a new key
	"Thélème" => "François Rabelais",
	];

	$this->map->update($iterable);
	$this->assertSame($expected, $this->map->toArray());
	}

	public function testToArray () {
	$this->assertEquals(self::MAP_CONTENT, $this->map->toArray());
	}

	///
	/// High order functions
	///

	public function testMap () {
	$callback = function ($value) {
	return "author='" . $value . "'";
	};

	$expected = [
	"The Culture" => "author='Iain Banks'",
	"Radchaai Empire" => "author='Ann Leckie'",
	"Barrayar" => "author='Lois McMaster Bujold'",
	"Hainish" => "author='Ursula K. Le Guin'",
	];

	$actual = $this->map->map($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testMapKeys () {
	$callback = function ($key) {
	return "civ::" . $key;
	};

	$expected = [
	// Some sci-fi civilizations and author
	"civ::The Culture" => "Iain Banks",
	"civ::Radchaai Empire" => "Ann Leckie",
	"civ::Barrayar" => "Lois McMaster Bujold",
	"civ::Hainish" => "Ursula K. Le Guin",
	];

	$actual = $this->map->mapKeys($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testMapKeysAndValues () : void {
	$callback = function ($civilization, $author) {
	return [$author[0], "$author, $civilization"];
	};

	$expected = [
	// Some sci-fi civilizations and author
	"I" => "Iain Banks, The Culture",
	"A" => "Ann Leckie, Radchaai Empire",
	"L" => "Lois McMaster Bujold, Barrayar",
	"U"=> "Ursula K. Le Guin, Hainish",
	];

	$actual = $this->map->mapValuesAndKeys($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testMapKeysAndValuesForVectors () : void {
	$callback = function ($author) {
	return [$author[0], "author:" . $author];
	};

	$expected = [
	// Some sci-fi civilizations and author
	"I" => "author:Iain Banks",
	"A" => "author:Ann Leckie",
	"L" => "author:Lois McMaster Bujold",
	"U" => "author:Ursula K. Le Guin",
	];

	$actual = $this->map->mapValuesAndKeys($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testMapKeysAndValuesWithCallbackWithoutArgument() : void {
	$this->expectException(InvalidArgumentException::class);

	$callback = function () {};
	$this->map->mapValuesAndKeys($callback);
	}

	public function testFlatMap(): void {
	$callback = function ($key, $value) {
	$items = explode(" ", $value);

	foreach ($items as $item) {
	yield $item => $key;
	}
	};

	$expected = [
	"Iain" => "The Culture",
	"Banks" => "The Culture",

	"Ann" => "Radchaai Empire",
	"Leckie" => "Radchaai Empire",

	"Lois" => "Barrayar",
	"McMaster" => "Barrayar",
	"Bujold" => "Barrayar",

	"Ursula"=> "Hainish",
	"K."=> "Hainish",
	"Le"=> "Hainish",
	"Guin"=> "Hainish",
	];

	$actual = $this->map->flatMap($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testFlatMapForVectors() : void {
	$callback = function ($value) {
	$items = explode(" ", $value);

	foreach ($items as $item) {
	yield $item => $value;
	}
	};

	$expected = [
	"Iain" => "Iain Banks",
	"Banks" => "Iain Banks",

	"Ann" => "Ann Leckie",
	"Leckie" => "Ann Leckie",

	"Lois" => "Lois McMaster Bujold",
	"McMaster" => "Lois McMaster Bujold",
	"Bujold" => "Lois McMaster Bujold",

	"Ursula"=> "Ursula K. Le Guin",
	"K."=> "Ursula K. Le Guin",
	"Le"=> "Ursula K. Le Guin",
	"Guin"=> "Ursula K. Le Guin",
	];

	$actual = $this->map->flatMap($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testFlatMapWithCallbackWithoutArgument() : void {
	$this->expectException(InvalidArgumentException::class);

	$callback = function () {};
	$this->map->flatMap($callback);
	}

	public function testMapToVector() : void {
	$expected = [
	"The Culture by Iain Banks",
	"Radchaai Empire by Ann Leckie",
	"Barrayar by Lois McMaster Bujold",
	"Hainish by Ursula K. Le Guin",
	];

	$fn = fn($key, $value) => "$key by $value";

	$this->assertEquals($expected, $this->map->mapToVector($fn)->toArray());
	}

	public function testMapToVectorWithOnlyValueParameter() : void {
	$expected = [
	"Author: Iain Banks",
	"Author: Ann Leckie",
	"Author: Lois McMaster Bujold",
	"Author: Ursula K. Le Guin",
	];

	$fn = fn($value) => "Author: $value";

	$this->assertEquals($expected, $this->map->mapToVector($fn)->toArray());
	}

	public function testMapToVectorWithoutParameter() : void {
	$this->expectException(InvalidArgumentException::class);

	$fn = fn() => "";

	$this->map->mapToVector($fn);
	}

	public function testFilter () {
	// Let's filter to keep names with 3 parts or more

	$callback = function ($value) : bool {
	return str_word_count($value) > 2;
	};

	$expected = [
	// Some sci-fi civilizations and author
	"Barrayar" => "Lois McMaster Bujold",
	"Hainish" => "Ursula K. Le Guin",
	];

	$actual = $this->map->filter($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testFilterWithKeyValueCallback () {
	// Let's find civilization AND author with e inside

	$expected = [
	// Some sci-fi civilizations and author
	"Radchaai Empire" => "Ann Leckie",
	];

	$callback = function ($key, $value) : bool {
	return str_contains($key, "e") && str_contains($value, "e");
	};

	$actual = $this->map->filter($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testFilterWithCallbackWithoutArgument() {
	$this->expectException(InvalidArgumentException::class);

	$callback = function () : bool { // No argument
	return true;
	};

	$this->map->filter($callback);
	}

	public function testFilterKeys () {
	// Let's filter to keep short civilization names

	$callback = function ($key) : bool {
	return str_word_count($key) == 1;
	};

	$expected = [
	// Some sci-fi civilizations and author
	"Barrayar" => "Lois McMaster Bujold",
	"Hainish" => "Ursula K. Le Guin",
	];

	$actual = $this->map->filterKeys($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	+ ///
	+ /// HOF methods - WithCollection
	+ ///
	+
	+ public function testAny () : void {
	+ $author_is_Iain_Banks = fn($author) => $author === "Iain Banks";
	+
	+ $this->assertTrue($this->map->any($author_is_Iain_Banks));
	+ }
	+
	+ public function testAnyWithAllFalseValues () : void {
	+ $author_is_Isaac_Asimov = fn($author) => $author === "Isaac Asimov";
	+
	+ $this->assertFalse($this->map->any($author_is_Isaac_Asimov));
	+ }
	+
	+ public function testAll () : void {
	+ $author_contains_space = fn($author) => str_contains($author, " ");
	+
	+ $this->assertTrue($this->map->all($author_contains_space));
	+ }
	+
	+ public function testAllWithFalseValue () : void {
	+ $author_is_Iain_Banks = fn($author) => $author === "Iain Banks";
	+
	+ $this->assertFalse($this->map->all($author_is_Iain_Banks));
	+ }
	+
	///
	/// ArrayAccess
	///

	public function testOffsetExists () : void {
	$this->assertTrue(isset($this->map["The Culture"]));
	$this->assertFalse(isset($this->map["Not existing"]));
	}

	public function testOffsetSetWithoutOffset () : void {
	$this->expectException(InvalidArgumentException::class);
	$this->map[] = "Another Author";
	}

	public function testOffsetSet () : void {
	$this->map["The Culture"] = "Iain M. Banks";
	$this->assertEquals("Iain M. Banks", $this->map["The Culture"]);
	}

	public function testOffsetUnset () : void {
	unset($this->map["Barrayar"]);

	$expected = [
	"The Culture" => "Iain Banks",
	"Radchaai Empire" => "Ann Leckie",
	// "Barrayar" => "Lois McMaster Bujold", UNSET ENTRY
	"Hainish" => "Ursula K. Le Guin",
	];

	$this->assertEquals($expected, $this->map->toArray());
	}

	///
	/// IteratorAggregate
	///

	public function testGetIterator () : void {
	$this->assertEquals(self::MAP_CONTENT, iterator_to_array($this->map));
	}

	///
	/// WithCollection trait
	///

	public function testFirst () : void {
	$this->assertEquals("Iain Banks", $this->map->first());
	}

	public function testFirstWhenEmpty () : void {
	$map = new HashMap();

	$this->expectException(OutOfRangeException::class);
	$map->first();
	}

	public function testFirstOr () : void {
	$bits = BitsVector::new(4);
	$bits[2] = 1;

	$this->assertEquals("Iain Banks", $this->map->firstOr("Anonymous"));
	}

	public function testFirstOrWhenEmpty () : void {
	$map = new HashMap();

	$this->assertEquals("Anonymous", $map->firstOr("Anonymous"));
	}

	}
	diff --git a/tests/Collections/VectorTest.php b/tests/Collections/VectorTest.php
	index 49941b7..98883e9 100644
	--- a/tests/Collections/VectorTest.php
	+++ b/tests/Collections/VectorTest.php
	@@ -1,432 +1,456 @@
	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\Tests\Collections;

	use Keruald\OmniTools\Collections\BaseVector;
	use Keruald\OmniTools\Collections\HashMap;
	use Keruald\OmniTools\Collections\Vector;

	use PHPUnit\Framework\Attributes\CoversClass;
	use PHPUnit\Framework\Attributes\DataProvider;
	use PHPUnit\Framework\TestCase;

	use InvalidArgumentException;
	use IteratorAggregate;
	use OutOfRangeException;
	use Traversable;

	#[CoversClass(Vector::class)]
	#[CoversClass(BaseVector::class)]
	class VectorTest extends TestCase {

	private Vector $vector;

	protected function setUp () : void {
	$this->vector = new Vector([1, 2, 3, 4, 5]);
	}

	public function testConstructorWithIterable () : void {
	$iterable = new class implements IteratorAggregate {
	public function getIterator () : Traversable {
	yield 42;
	yield 100;
	}
	};

	$vector = new Vector($iterable);
	$this->assertEquals([42, 100], $vector->toArray());
	}

	public function testFrom () : void {
	$this->assertEquals([42, 100], Vector::from([42, 100])->toArray());
	}

	public function testGet () : void {
	$vector = new Vector(["a", "b", "c"]);

	$this->assertEquals("b", $vector->get(1));
	}

	public function testGetOverflow () : void {
	$this->expectException(InvalidArgumentException::class);

	$this->vector->get(800);
	}

	public function testGetOr () : void {
	$vector = new Vector(["a", "b", "c"]);

	$this->assertEquals("X", $vector->getOr(800, "X"));
	}

	public function testSet () : void {
	$vector = new Vector(["a", "b", "c"]);
	$vector->set(1, "x"); // should replace "b"

	$this->assertEquals(["a", "x", "c"], $vector->toArray());
	}

	public function testContains () : void {
	$this->assertTrue($this->vector->contains(2));
	$this->assertFalse($this->vector->contains(666));
	}

	public function testCount () : void {
	$this->assertEquals(5, $this->vector->count());
	$this->assertEquals(0, (new Vector)->count());
	}

	public function testClear () : void {
	$this->vector->clear();

	$this->assertEquals(0, $this->vector->count());
	}

	public function testIsEmpty () : void {
	$this->vector->clear();

	$this->assertTrue($this->vector->isEmpty());
	}

	public function testPush () : void {
	$this->vector->push(6);

	$this->assertEquals([1, 2, 3, 4, 5, 6], $this->vector->toArray());
	}

	public function testAppend () : void {
	$this->vector->append([6, 7, 8]);

	$this->assertEquals([1, 2, 3, 4, 5, 6, 7 ,8], $this->vector->toArray());
	}

	public function testUpdate () : void {
	$this->vector->update([5, 5, 5, 6, 7, 8]); // 5 already exists

	$this->assertEquals([1, 2, 3, 4, 5, 6, 7 ,8], $this->vector->toArray());
	}

	public function testMap () : void {
	$actual = $this->vector
	->map(function ($x) { return $x * $x; })
	->toArray();

	$this->assertEquals([1, 4, 9, 16, 25], $actual);
	}

	public function testMapKeys () : void {
	$vector = new Vector(["foo", "bar", "quux", "xizzy"]);

	$filter = function ($key) {
	return 0; // Let's collapse our array
	};

	$actual = $vector->mapKeys($filter)->toArray();
	$this->assertEquals(["xizzy"], $actual);

	}

	public function testFlatMap () : void {
	$expected = [
	// Squares and cubes
	1, 1,
	4, 8,
	9, 27,
	16, 64,
	25, 125
	];

	$callback = function ($n) {
	yield $n * $n;
	yield $n * $n * $n;
	};

	$actual = $this->vector->flatMap($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testFlatMapWithKeyValueCallback() : void {
	$vector = new Vector(["foo", "bar", "quux", "xizzy"]);

	$callback = function (int $key, string $value) {
	yield "$key::$value";
	yield "$value ($key)";
	};

	$expected = [
	"0::foo",
	"foo (0)",

	"1::bar",
	"bar (1)",

	"2::quux",
	"quux (2)",

	"3::xizzy",
	"xizzy (3)",
	];

	$actual = $vector->flatMap($callback)->toArray();
	$this->assertEquals($expected, $actual);
	}

	public function testFlatMapWithCallbackWithoutArgument() : void {
	$this->expectException(InvalidArgumentException::class);

	$callback = function () {};
	$this->vector->flatMap($callback);
	}

	public function testMapToHashMap () : void {
	$expected = [
	1 => 1,
	2 => 4,
	3 => 9,
	4 => 16,
	5 => 25,
	];

	$fn = fn($value) => [$value, $value * $value];
	$map = $this->vector->mapToHashMap($fn);

	$this->assertInstanceOf(HashMap::class, $map);
	$this->assertEquals($expected, $map->toArray());
	}

	public function testMapToHashMapWithCallbackWithoutArgument() : void {
	$this->expectException(InvalidArgumentException::class);

	$callback = function () {};
	$this->vector->mapToHashMap($callback);
	}

	public function testMapToHashMapWithBadCallback () : void {
	$this->expectException(InvalidArgumentException::class);

	$callback = fn($key, $value) : bool => false; // not an array

	$this->vector->mapToHashMap($callback);
	}


	public function testFilter () : void {
	$vector = new Vector(["foo", "bar", "quux", "xizzy"]);

	$filter = function ($item) {
	return strlen($item) === 3; // Let's keep 3-letters words
	};

	$actual = $vector->filter($filter)->toArray();
	$this->assertEquals(["foo", "bar"], $actual);
	}

	public function testFilterWithBadCallback () : void {
	$this->expectException(InvalidArgumentException::class);

	$badFilter = function () {};

	$this->vector->filter($badFilter);
	}

	public function testFilterKeys () : void {
	$filter = function ($key) {
	return $key % 2 === 0; // Let's keep even indices
	};

	$actual = $this->vector
	->filterKeys($filter)
	->toArray();

	$this->assertEquals([0, 2, 4], array_keys($actual));
	}

	+ public function testAny () : void {
	+ $is_even = fn(int $item) : bool => $item % 2 === 0;
	+
	+ $this->assertTrue($this->vector->any($is_even));
	+ }
	+
	+ public function testAnyWithAllFalseValues () : void {
	+ $is_zero = fn(int $item) : bool => $item === 0;
	+
	+ $this->assertFalse($this->vector->any($is_zero));
	+ }
	+
	+ public function testAll () : void {
	+ $under_ten = fn(int $item) : bool => $item < 10;
	+
	+ $this->assertTrue($this->vector->all($under_ten));
	+ }
	+
	+ public function testAllWithFalseValue () : void {
	+ $is_even = fn(int $item) : bool => $item % 2 === 0;
	+
	+ $this->assertFalse($this->vector->all($is_even));
	+ }
	+
	public function testChunk () : void {
	$vector = new Vector([1, 2, 3, 4, 5, 6]);

	$this->assertEquals(
	[[1, 2], [3, 4], [5, 6]],
	$vector->chunk(2)->toArray()
	);
	}

	public function testSlice () : void {
	$actual = $this->vector->slice(2, 3);
	$this->assertEquals([3, 4, 5], $actual->toArray());
	}

	public function testImplode() : void {
	$actual = (new Vector(["a", "b", "c"]))
	->implode(".")
	->__toString();

	$this->assertEquals("a.b.c", $actual);
	}

	public function testImplodeWithoutDelimiter() : void {
	$actual = (new Vector(["a", "b", "c"]))
	->implode("")
	->__toString();

	$this->assertEquals("abc", $actual);
	}

	public function testExplode() : void {
	$actual = Vector::explode(".", "a.b.c");

	$this->assertEquals(["a", "b", "c"], $actual->toArray());
	}

	public function testExplodeWithoutDelimiter() : void {
	$actual = Vector::explode("", "a.b.c");

	$this->assertEquals(["a.b.c"], $actual->toArray());
	}

	///
	/// n-grams
	///

	public function testBigrams() : void {
	$expected = Vector::from([
	[1, 2],
	[2, 3],
	[3, 4],
	[4, 5],
	]);

	$this->assertEquals($expected, $this->vector->bigrams());
	}

	public function testTrigrams() : void {
	$expected = Vector::from([
	[1, 2, 3],
	[2, 3, 4],
	[3, 4, 5],
	]);

	$this->assertEquals($expected, $this->vector->trigrams());
	}

	public function testNgrams() : void {
	$expected = Vector::from([
	[1, 2, 3, 4],
	[2, 3, 4, 5],
	]);

	$this->assertEquals($expected, $this->vector->ngrams(4));
	}

	public function testNgramsWithN1 () : void {
	$expected = Vector::from([
	[1],
	[2],
	[3],
	[4],
	[5],
	]);

	$this->assertEquals($expected, $this->vector->ngrams(1));
	}

	public static function provideLowN () : iterable {
	yield [0];
	yield [-1];
	yield [PHP_INT_MIN];
	}

	#[DataProvider('provideLowN')]
	public function testNgramsWithTooLowN ($n) : void {
	$this->expectException(InvalidArgumentException::class);
	$this->vector->ngrams($n);
	}

	public static function provideLargeN () : iterable {
	yield [5];
	yield [6];
	yield [PHP_INT_MAX];
	}

	#[DataProvider('provideLargeN')]
	public function testNgramsWithTooLargeN ($n) : void {
	$expected = Vector::from([
	[1, 2, 3, 4, 5],
	]);

	$this->assertEquals($expected, $this->vector->ngrams($n));
	}

	///
	/// ArrayAccess
	///

	public function testArrayAccessFailsWithStringKey () : void {
	$this->expectException(InvalidArgumentException::class);

	$this->vector["foo"];
	}

	public function testOffsetExists () : void {
	$this->assertTrue(isset($this->vector[0]));
	$this->assertFalse(isset($this->vector[8]));
	}

	public function testOffsetSetWithoutOffset () : void {
	$this->vector[] = 6;
	$this->assertEquals(6, $this->vector[5]);
	}

	public function testOffsetSet () : void {
	$this->vector[0] = 9;
	$this->assertEquals(9, $this->vector[0]);
	}

	public function testOffsetUnset () : void {
	unset($this->vector[2]);

	$expected = [
	0 => 1,
	1 => 2,
	// vector[2] has been unset
	3 => 4,
	4 => 5,
	];

	$this->assertEquals($expected, $this->vector->toArray());
	}

	///
	/// IteratorAggregate
	///

	public function testGetIterator () : void {
	$this->assertEquals([1, 2, 3, 4, 5], iterator_to_array($this->vector));
	}

	///
	/// WithCollection trait
	///

	public function testFirst () : void {
	$this->assertEquals(1, $this->vector->first());
	}

	public function testFirstWhenEmpty () : void {
	$vector = new Vector;

	$this->expectException(OutOfRangeException::class);
	$vector->first();
	}

	public function testFirstOr () : void {
	$this->assertEquals(1, $this->vector->firstOr(2));
	}

	public function testFirstOrWhenEmpty () : void {
	$vector = new Vector;

	$this->assertEquals(2, $vector->firstOr(2));
	}

	}

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