You can just return an object without parenthesis ()

const listSquared = (m, n) => {
let list = [];
for (let i = m; i <= n; i++) {
let divisors = [];
for (let k = 1; k <= i; k++) {
i % k === 0 ? divisors.push(k) : divisors;
}
let sqrt = Math.sqrt(
divisors.reduce((prev, curr) => {
return prev + Math.pow(curr, 2);
}, 0)
);
if (Math.floor(sqrt) === sqrt) {
list.push([i, Math.pow(sqrt,2)]);
}
}
return list;
};

It will be better if you divide the code into parts, book https://refactor-like-a-superhero.vercel.app/

you told already what i was thinking to say. well done. 👏

No longer an issue.

Fixed, please approve!
https://www.codewars.com/kumite/638743d608488f22b0fe704e?sel=638743d608488f22b0fe704e

yes, your solution is better

XD

Can someone please explain this problem? Surprised there is 0 comments in all the solutions as I completely don't understand the question nor answer

yes same here

Could somebody explain, why does it fail when the first element is a string?

Man, I tried to do this but failed...

Nice, first time I encounter Math.hypot!

Wrong, your posts here are visible in the homepage when not marked as spoilers. There is no need to mark them all either, only when needed.