Issue #3508990 by tr: Add some new VoteResultFunction plugins

src/Plugin/VoteResultFunction/Maximum.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\votingapi\Plugin\VoteResultFunction;
+
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\votingapi\Attribute\VoteResultFunction;
+use Drupal\votingapi\VoteResultFunctionBase;
+
+/**
+ * The maximum of a set of votes.
+ */
+#[VoteResultFunction(
+  id: "vote_maximum",
+  label: new TranslatableMarkup("Maximum"),
+  description: new TranslatableMarkup("The maximum vote value.")
+)]
+class Maximum extends VoteResultFunctionBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateResult(array $votes): float {
+    $max = 0;
+    /** @var \Drupal\votingapi\VoteInterface[] $votes */
+    foreach ($votes as $vote) {
+      $value = $vote->getValue();
+      if ($value > $max) {
+        $max = $value;
+      }
+    }
+    return $max;
+  }
+
+}

src/Plugin/VoteResultFunction/Median.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\votingapi\Plugin\VoteResultFunction;
+
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\votingapi\Attribute\VoteResultFunction;
+use Drupal\votingapi\VoteResultFunctionBase;
+
+/**
+ * The median of a set of votes.
+ */
+#[VoteResultFunction(
+  id: "vote_median",
+  label: new TranslatableMarkup("Median"),
+  description: new TranslatableMarkup("The median vote value.")
+)]
+class Median extends VoteResultFunctionBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateResult(array $votes): float {
+    /** @var \Drupal\votingapi\VoteInterface[] $votes */
+    $count = count($votes);
+    if ($count === 0) {
+      return 0;
+    }
+
+    $halfway = intdiv($count, 2);
+    usort($votes, function ($a, $b) {
+      $av = $a->getValue();
+      $bv = $b->getValue();
+      if ($av == $bv) {
+        return 0;
+      }
+      return ($av < $bv) ? -1 : 1;
+    });
+
+    if ($count & 1) {
+      // Count is odd.
+      return $votes[$halfway]->getValue();
+    }
+    else {
+      // Count is even.
+      // Assumes numerically indexed array starting with 0, and that's exactly
+      // what we have here because the usort() call replaces the original keys.
+      return ($votes[$halfway - 1]->getValue() + $votes[$halfway]->getValue()) / 2;
+    }
+  }
+
+}

src/Plugin/VoteResultFunction/Minimum.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\votingapi\Plugin\VoteResultFunction;
+
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\votingapi\Attribute\VoteResultFunction;
+use Drupal\votingapi\VoteResultFunctionBase;
+
+/**
+ * The minimum of a set of votes.
+ */
+#[VoteResultFunction(
+  id: "vote_minimum",
+  label: new TranslatableMarkup("Minimum"),
+  description: new TranslatableMarkup("The minimum vote value.")
+)]
+class Minimum extends VoteResultFunctionBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateResult(array $votes): float {
+    /** @var \Drupal\votingapi\VoteInterface[] $votes */
+    $min = reset($votes)->getValue();
+    foreach ($votes as $vote) {
+      $value = $vote->getValue();
+      if ($value < $min) {
+        $min = $value;
+      }
+    }
+    return $min;
+  }
+
+}