Allow for even numbered arrays

.gitignore

@@ -0,0 +1,54 @@
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+.idea/
+.idea/*
+.idea/codeStyleSettings.xml
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+

spec/Median/MedianSpec.php

@@ -57,4 +57,25 @@ function it_should_return_a_median_of_9_for_1_4_7_9_11_100_250_3_14()
         $this->beConstructedWith($array);
         $this->median($array)->shouldEqual(9);
     }
+
+    function it_should_return_a_median_of_3point5_for_1_2_3_4_5_6()
+    {
+        $array = [1,2,3,4,5,6];
+        $this->beConstructedWith($array);
+        $this->median($array)->shouldEqual(3.5);
+    }
+
+    function it_should_return_a_median_of_4point5_for_1_2_3_4_5_6_7_8()
+    {
+        $array = [1,2,3,4,5,6,7,8];
+        $this->beConstructedWith($array);
+        $this->median($array)->shouldEqual(4.5);
+    }
+
+    function it_should_return_a_median_of_56_for_66_13_46_378_336_26_4_77_5_92()
+    {
+        $array = [66,13,46,378,336,26,4,77,5,92];
+        $this->beConstructedWith($array);
+        $this->median($array)->shouldEqual(56);
+    }
 }

src/Median/Median.php

@@ -6,9 +6,9 @@ class Median
     protected $array;
 
     /**
-     * Class constructor
-     *
-     * @param array $array
+     * Median constructor.
+     * @param $array
+     * @throws \Exception
      */
     public function __construct($array)
     {
@@ -37,15 +37,16 @@ public function average()
 
     /**
      * Returns the median of all array values
-     *
-     * @return mixed
+     * @return float|int
      */
     public function median()
     {
-        if (count($this->array) %2 == 0) {
-            return ($this->array[(count($this->array)/2 - 1)]);
+        $arrayMidpoint = (int) floor((count($this->array) / 2));
+        if (count($this->array) % 2 != 0) {
+            return ($this->array[$arrayMidpoint]);
         } else {
-            return $this->array[floor(count($this->array)/2)];
+            $arrayMidpointLower = $arrayMidpoint - 1;
+            return ($this->array[$arrayMidpointLower] + $this->array[$arrayMidpoint]) / 2;
         }
     }
 }