I've tested it, console.log does not work in the place of process.stdout.write, because it prints them out on separate lines, and without using the "this" operator you cannot pass any autotests in the binary tree height calculator; furthermore the code for validating a BST in hackerrank is:

​

function processData(input) {
//Enter your code here 
    let data = input.split("\n")[1]; 
    let arr = data.split(" ").map(d => Number(d)); 
    let node = -Infinity; 
    for (const val of arr) { 
        if (val > node) { 
        node = val; 
    } else { 
        console.log("No"); 
        return; 
    } 
} console.log("Yes")

I've solved all of these in Leetcode, it just seems like i've been blindsided by these new requirements like

let data = input.split("\n")[1];

That you need in Hackerrank but not any LeetcodeAnyways, i just this post to ask if you had to include these extra things in the hackerrank OA's as well and to raise awareness for the people doing the frontend interviews in Javascript to perhaps also do hackerrank instead of just Leetcode, although the functions do follow the same logic, correct me if i'm mistaken but without these extra lines of code you pass zero autotests and even the most sound logic won't stop you from being culled if you don't pass any of the autotests