Updated median()

js/utils.js

@@ -387,17 +387,17 @@ function deepAssign(target, source) {
 }
 
 /**
- * Returns the median number of an array
+ * Returns the median value for an array
  * For more information about mean vs. median see
  * https://www.clinfo.eu/mean-median/
  * @param {[number]} arr Does not need to be sorted
  */
 function median(arr = []) {
-	arr.sort();
-
-	const mid = Math.ceil(arr.length / 2);
+	const
+		mid = Math.floor(arr.length / 2),
+		nums = [...arr].sort((a, b) => a - b);
 
 	return arr.length % 2 === 0 ?
-		(arr[mid] + arr[mid - 1] / 2) :
-		arr[mid - 1];
+		(nums[mid] + nums[mid - 1]) / 2 :
+		nums[mid];
 }