max-heap-recursive.js

const heap = Array.from(Array(100), () => Math.floor(Math.random() * 100));

const main = () => {
    for (let i = 1; i < heap.length; i++) run(heap, i);
};
const run = (array, target) => {
    const root = Math.floor((target - 1) / 2);
    if (array[root] < array[target]) {
        let temp = array[root];
        array[root] = array[target];
        array[target] = temp;
    }
    if (root) run(array, root);
}
main();
console.log(heap);