From 3783a249f9f14fd51c86cb8daca25f24907e7a31 Mon Sep 17 00:00:00 2001
From: Manish <manish@radii.dev>
Date: Mon, 11 Sep 2023 12:14:51 +1000
Subject: [PATCH] Data Structures: Implement Heap Sort with a Min Heap

---
 Data Structures/heapSort.js | 70 +++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Data Structures/heapSort.js

diff --git a/Data Structures/heapSort.js b/Data Structures/heapSort.js
new file mode 100644
index 0000000..5d8e99b
--- /dev/null
+++ b/Data Structures/heapSort.js	
@@ -0,0 +1,70 @@
+// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/implement-heap-sort-with-a-min-heap
+function isSorted(a) {
+  for (let i = 0; i < a.length - 1; i++) if (a[i] > a[i + 1]) return false;
+  return true;
+}
+// Generate a randomly filled array
+function createRandomArray(size = 5) {
+  let a = new Array(size);
+  for (let i = 0; i < size; i++) a[i] = Math.floor(Math.random() * 100);
+
+  return a;
+}
+const array = createRandomArray(25);
+
+var MinHeap = function () {
+  // Only change code below this line
+  this.heap = [];
+
+  this.insert = (item) => {
+    this.heap.push(item);
+    let me = this.heap.length - 1;
+    let parent = Math.trunc((me - 1) / 2);
+    while (parent != me && this.heap[parent] > this.heap[me]) {
+      const tmp = this.heap[parent];
+      this.heap[parent] = this.heap[me];
+      this.heap[me] = tmp;
+      me = parent;
+      parent = Math.trunc((me - 1) / 2);
+    }
+  };
+
+  this.print = () => this.heap;
+
+  this.remove = () => {
+    if (!this.heap.length) {
+      return;
+    }
+    const max = this.heap[0];
+    this.heap[0] = this.heap[this.heap.length - 1];
+    this.heap.pop();
+    let i = 0;
+    while (
+      this.heap[i] > this.heap[i * 2 + 1] ||
+      this.heap[i] > this.heap[i * 2 + 2]
+    ) {
+      let swapWith = i * 2 + 1;
+      if (this.heap[swapWith] > this.heap[swapWith + 1]) swapWith++;
+      const tmp = this.heap[i];
+      this.heap[i] = this.heap[swapWith];
+      this.heap[swapWith] = tmp;
+      i = swapWith;
+    }
+    return max;
+  };
+
+  this.sort = () => {
+    const sorted = [];
+    while (this.heap.length) {
+      sorted.push(this.remove());
+    }
+    return sorted;
+  };
+  // Only change code above this line
+};
+
+const h = new MinHeap();
+for (let i = 0; i < 10; i++) {
+  h.insert(Math.trunc(Math.random() * 100));
+}
+console.log(h.print());