convert min heap to max heap

Author: manju07

Data-Structure/Tree/Heap/binaryHeap.js renamed to Data-Structure/Heap/binaryHeap.js

@@ -0,0 +1,24 @@
+'use strict';
+function maxHeapify(root, n, arr) {
+    let largest = root;
+    let l = (root * 2) + 1;
+    let r = (root * 2) + 2;
+    if (l < n && arr[l] > arr[largest]) largest = l;
+    if (r < n && arr[r] > arr[largest]) largest = r;
+    if (largest != root) {
+        let temp = arr[root];
+        arr[root] = arr[largest];
+        arr[largest] = temp;
+        maxHeapify(largest, n, arr);
+    }
+}
+
+function constructMaxHeap(arr) {
+    for (let index = (arr.length - 2) / 2; index >= 0; index--)
+        maxHeapify(index, arr.length, arr);
+}
+
+let arr = [3, 5, 9, 6, 8, 20, 10, 12, 18, 9];
+console.log('Min Heap - ', arr.join(', '));
+constructMaxHeap(arr);
+console.log('Max Heap - ', arr.join(', '));