Create median.ts

src/math/median.ts

@@ -0,0 +1,32 @@
+/**
+ * This function calculates the median value of a number array.
+ * 
+ * @function
+ * @param array List of numbers
+ * @returns The median value
+ */
+export function median(array : number[]) : number {
+    const sumOfArray = array.reduce(
+        (
+            previousValue,
+            currentValue
+        ) => {
+            return previousValue + currentValue
+        },
+        0
+    );
+
+    if (sumOfArray === 0) {
+        return 0;
+    }
+
+    const isOdd = ((array.length % 2) === 1);
+
+    array.sort((a, b) => a - b);
+
+    if (isOdd) {
+        return array[(array.length + 1) / 2];
+    } 
+
+    return (array[(array.length / 2) - 1] + array[array.length / 2]) / 2
+}