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Mastering Data Structures and Sorting Algorithms in JavaScript

Heap Sort (Implementation)

Understand how to implement heap sort by converting an array into a max heap through heapification. Learn the step-by-step process of maintaining heap properties while sorting an array in ascending order, and grasp the importance of heap structure and time complexity in this algorithm.

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To make a heap out of an array, we first need to go over all the items in the array, from right to left. This is necessary, as we start at the leaves. It receives the array we want to sort, and invokes the function that makes a heap on every element.

Node.js
function makeHeap(arr) {
  const n = arr.length;
  for (let i = Math.floor(n / 2) - 1; i >= 0; i--) {
    // Heapify function.
  }
}

The heapify function should receive the array, the length of the array, and the current index. In order to make the heap, this order is very ...