London | 25-ITP-May | Houssam Lahlah | Sprint 3 | Quote-Generator

Sprint-1/fix/median.js

@@ -6,9 +6,25 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
+  if (!Array.isArray(list)) return null;
+
+  // Filter to keep only numbers
+  const numbers = list.filter(item => typeof item === "number");
+
+  if (numbers.length === 0) return null;
+
+  // Sort numbers ascending (without modifying original array)
+  const sorted = [...numbers].sort((a, b) => a - b);
+
+  const mid = Math.floor(sorted.length / 2);
+
+  if (sorted.length % 2 !== 0) {
+    // Odd length, return middle value
+    return sorted[mid];
+  } else {
+    // Even length, return average of two middle values
+    return (sorted[mid - 1] + sorted[mid]) / 2;
+  }
 }
 
 module.exports = calculateMedian;