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diff --git a/src/Collections/Comparable.php b/src/Collections/Comparable.php
new file mode 100644
index 0000000..b70f724
--- /dev/null
+++ b/src/Collections/Comparable.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Keruald\OmniTools\Collections;
+
+interface Comparable {
+
+ public function compareTo (object $other) : int;
+
+}
diff --git a/src/Collections/WeightedList.php b/src/Collections/WeightedList.php
new file mode 100644
index 0000000..4060c22
--- /dev/null
+++ b/src/Collections/WeightedList.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace Keruald\OmniTools\Collections;
+
+use ArrayIterator;
+use Countable;
+use Iterator;
+use IteratorAggregate;
+
+class WeightedList implements IteratorAggregate, Countable {
+
+ /**
+ * @var WeightedValue[]
+ */
+ private $list;
+
+ public function __construct () {
+ $this->list = [];
+ }
+
+ ///
+ /// Helper methods
+ ///
+
+ public function add ($item, float $weight = 1.0) : void {
+ $this->list[] = new WeightedValue($item, $weight);
+ }
+
+ public function clear () : void {
+ $this->list = [];
+ }
+
+ public function getHeaviest () {
+ $value = null;
+
+ foreach ($this->list as $candidate) {
+ if ($value === null || $candidate->compareTo($value) > 0) {
+ $value = $candidate;
+ }
+ }
+
+ return $value;
+ }
+
+ public function toSortedArray () : array {
+ $weights = [];
+ $values = [];
+
+ foreach ($this->list as $item) {
+ $weights[] = $item->getWeight();
+ $values[] = $item->getValue();
+ }
+
+ array_multisort($weights, SORT_DESC, $values, SORT_ASC);
+
+ return $values;
+ }
+
+ ///
+ /// IteratorAggregate implementation
+ ///
+
+ public function getIterator () : Iterator {
+ return new ArrayIterator($this->list);
+ }
+
+ ///
+ /// Countable implementation
+ ///
+
+ public function count () : int {
+ return count($this->list);
+ }
+
+}
diff --git a/src/Collections/WeightedValue.php b/src/Collections/WeightedValue.php
new file mode 100644
index 0000000..921a523
--- /dev/null
+++ b/src/Collections/WeightedValue.php
@@ -0,0 +1,75 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Collections;
+
+use TypeError;
+
+class WeightedValue implements Comparable {
+
+ ///
+ /// Constants
+ ///
+
+ const DEFAULT_WEIGHT = 1.0;
+
+ ///
+ /// Private members
+ ///
+
+ /**
+ * @var float
+ */
+ private $weight = self::DEFAULT_WEIGHT;
+
+ /**
+ * @var mixed
+ */
+ private $value;
+
+ ///
+ /// Constructor
+ ///
+
+ public function __construct ($value, float $weight = self::DEFAULT_WEIGHT) {
+ $this->value = $value;
+ $this->weight = $weight;
+ }
+
+ ///
+ /// Getters and setters
+ ///
+
+ public function getWeight () : float {
+ return $this->weight;
+ }
+
+ public function setWeight (float $weight) : self {
+ $this->weight = $weight;
+
+ return $this;
+ }
+
+ public function getValue () {
+ return $this->value;
+ }
+
+ public function setValue ($value) : self {
+ $this->value = $value;
+
+ return $this;
+ }
+
+ ///
+ /// Helper methods
+ ///
+
+ public function compareTo (object $other) : int {
+ if (!$other instanceof WeightedValue) {
+ throw new TypeError;
+ }
+
+ return $this->getWeight() <=> $other->getWeight();
+ }
+
+}
diff --git a/tests/Collections/WeightedListTest.php b/tests/Collections/WeightedListTest.php
new file mode 100644
index 0000000..e3daeb9
--- /dev/null
+++ b/tests/Collections/WeightedListTest.php
@@ -0,0 +1,79 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Tests\Collections;
+
+use Keruald\OmniTools\Collections\WeightedValue;
+use Keruald\OmniTools\Collections\WeightedList;
+use PHPUnit\Framework\TestCase;
+
+class WeightedListTest extends TestCase {
+
+ /**
+ * @var WeightedList
+ */
+ private $list;
+
+ ///
+ /// Fixtures
+ ///
+
+ protected function setUp () : void {
+ $this->list = new WeightedList;
+ $this->list->add("LOW", 0.1);
+ $this->list->add("HIGH", 4);
+ $this->list->add("AVERAGE");
+ }
+
+ ///
+ /// Tests
+ ///
+
+ public function testAdd () : void {
+ $count = count($this->list);
+
+ $this->list->add("ANOTHER");
+
+ $this->assertEquals($count + 1, count($this->list));
+ }
+
+ public function testClear () : void {
+ $this->list->clear();
+ $this->assertEquals(0, count($this->list));
+ }
+
+ public function testGetHeaviest () : void {
+ $this->assertEquals(4, $this->list->getHeaviest()->getWeight());
+ }
+
+ public function testToSortedArray () : void {
+ $array = $this->list->toSortedArray();
+
+ $this->assertEquals(3, count($array));
+ $this->assertEquals(["HIGH", "AVERAGE", "LOW"], $array);
+ }
+
+ public function testToSortedArrayWithDuplicateValues () : void {
+ $this->list->add("AVERAGE");
+ $array = $this->list->toSortedArray();
+
+ $this->assertEquals(4, count($array));
+ $this->assertEquals(["HIGH", "AVERAGE", "AVERAGE", "LOW"], $array);
+ }
+
+ public function testGetIterator () : void {
+ $count = 0;
+
+ foreach ($this->list as $item) {
+ $this->assertInstanceOf(WeightedValue::class, $item);
+ $count++;
+ }
+
+ $this->assertEquals(3, $count);
+ }
+
+ public function testCount() : void {
+ $this->assertEquals(3, $this->list->count());
+ }
+
+}
diff --git a/tests/Collections/WeightedValueTest.php b/tests/Collections/WeightedValueTest.php
new file mode 100644
index 0000000..f26be5a
--- /dev/null
+++ b/tests/Collections/WeightedValueTest.php
@@ -0,0 +1,79 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Tests\Collections;
+
+use Keruald\OmniTools\Collections\WeightedValue;
+use PHPUnit\Framework\TestCase;
+
+class WeightedValueTest extends TestCase {
+
+ /**
+ * @var WeightedValue
+ */
+ private $lowValue;
+
+ /**
+ * @var WeightedValue
+ */
+ private $highValue;
+
+ ///
+ /// Fixtures
+ ///
+
+ protected function setUp () : void {
+ $this->lowValue = new WeightedValue("LOW", 0.1);
+ $this->highValue = new WeightedValue("HIGH");
+ }
+
+ ///
+ /// Tests
+ ///
+
+ public function testGetWeight () : void {
+ $this->assertSame(0.1, $this->lowValue->getWeight());
+ $this->assertSame(
+ WeightedValue::DEFAULT_WEIGHT,
+ $this->highValue->getWeight()
+ );
+ }
+
+ public function testSetWeight () : void {
+ $this->lowValue->setWeight(0.2);
+ $this->assertSame(0.2, $this->lowValue->getWeight());
+ }
+
+ public function testGetValue () : void {
+ $this->assertEquals("LOW", $this->lowValue->getValue());
+ $this->assertEquals("HIGH", $this->highValue->getValue());
+ }
+
+ public function testSetValue () : void {
+ $this->lowValue->setValue("FOO");
+ $this->assertEquals("FOO", $this->lowValue->getValue());
+ }
+
+ public function testCompareTo () : void {
+ $this->assertEquals(
+ 0,
+ $this->lowValue->compareTo($this->lowValue)
+ );
+
+ $this->assertEquals(
+ -1,
+ $this->lowValue->compareTo($this->highValue)
+ );
+
+ $this->assertEquals(
+ 1,
+ $this->highValue->compareTo($this->lowValue)
+ );
+ }
+
+ public function testCompareToWithApplesAndPears () : void {
+ $this->expectException("TypeError");
+ $this->highValue->compareTo(new \stdClass);
+ }
+
+}

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