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diff --git a/omnitools/src/Collections/BaseCollection.php b/omnitools/src/Collections/BaseCollection.php
--- a/omnitools/src/Collections/BaseCollection.php
+++ b/omnitools/src/Collections/BaseCollection.php
@@ -5,6 +5,8 @@
abstract class BaseCollection {
+ use WithCollection;
+
///
/// Constructors
///
diff --git a/omnitools/src/Collections/WithCollection.php b/omnitools/src/Collections/WithCollection.php
new file mode 100644
--- /dev/null
+++ b/omnitools/src/Collections/WithCollection.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Keruald\OmniTools\Collections;
+
+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(),
+ };
+ }
+
+}
diff --git a/omnitools/tests/Collections/BitsVectorTest.php b/omnitools/tests/Collections/BitsVectorTest.php
--- a/omnitools/tests/Collections/BitsVectorTest.php
+++ b/omnitools/tests/Collections/BitsVectorTest.php
@@ -3,6 +3,7 @@
namespace Keruald\OmniTools\Tests\Collections;
use InvalidArgumentException;
+use OutOfRangeException;
use Keruald\OmniTools\Collections\BitsVector;
use PHPUnit\Framework\TestCase;
@@ -230,4 +231,35 @@
$this->assertEquals([0, 0, 1, 0], $bits->toArray());
}
+ ///
+ /// WithCollection trait
+ ///
+
+ public function testFirst () : void {
+ $bits = BitsVector::new(4);
+ $bits[2] = 1;
+
+ $this->assertEquals(0, $bits->first());
+ }
+
+ public function testFirstWhenEmpty () : void {
+ $bits = BitsVector::new(0);
+
+ $this->expectException(OutOfRangeException::class);
+ $bits->first();
+ }
+
+ public function testFirstOr () : void {
+ $bits = BitsVector::new(4);
+ $bits[2] = 1;
+
+ $this->assertEquals(0, $bits->firstOr(2));
+ }
+
+ public function testFirstOrWhenEmpty () : void {
+ $bits = BitsVector::new(0);
+
+ $this->assertEquals(2, $bits->firstOr(2));
+ }
+
}
diff --git a/omnitools/tests/Collections/HashMapTest.php b/omnitools/tests/Collections/HashMapTest.php
--- a/omnitools/tests/Collections/HashMapTest.php
+++ b/omnitools/tests/Collections/HashMapTest.php
@@ -2,12 +2,14 @@
namespace Keruald\OmniTools\Tests\Collections;
+use Keruald\OmniTools\Collections\BitsVector;
use Keruald\OmniTools\Collections\HashMap;
use PHPUnit\Framework\TestCase;
use InvalidArgumentException;
use IteratorAggregate;
+use OutOfRangeException;
use Traversable;
class HashMapTest extends TestCase {
@@ -462,4 +464,32 @@
$this->assertEquals(self::MAP_CONTENT, iterator_to_array($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/omnitools/tests/Collections/VectorTest.php b/omnitools/tests/Collections/VectorTest.php
--- a/omnitools/tests/Collections/VectorTest.php
+++ b/omnitools/tests/Collections/VectorTest.php
@@ -9,6 +9,7 @@
use InvalidArgumentException;
use IteratorAggregate;
+use OutOfRangeException;
use Traversable;
/**
@@ -373,4 +374,29 @@
$this->assertEquals([1, 2, 3, 4, 5], iterator_to_array($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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