If the "puzzle" tag refers to the description, you definitely got it right.

Yes, your code is even faster than mine

Btw I check the performance on jsbench.me, it's a great site

True, I probably didn't know about this method then

Square Matrix Multiplication

Test case 209917 -> [29917, 0, 1]

"the index i of the digit d you took, i as small as possible"
The digit d is 0. We took 0 at index 1. Why do we return 0?

"the index j (as small as possible) where you insert this digit d to have the smallest number."
We insert it at index 0. Why do we return 1?

Test case 269045 -> [26945, 3, 0] is pretty much the same, but the results make sense. I don't understand why we return [29917, 0, 1] and not [29917, 1, 0]

Братан, а нахрена ты себе накручиваешь рейтинг? Так нелепо, у тебя абсолютно на всех решениях по 2 best practices, без исключений. Тебе делать нечего, что ли?)

If you don't like my comment, you can just not read it. Same logic.
And no, I don't know what is going to be the solution for the kata I haven't solved yet.

And there is a dislike button for every kata. I think it exists for a reason - to express your negative opinion about the kata.
The comment section exists pretty much for the same reason.
What's the problem with critisizing something? Some feelings can get hurt?

Here. The guy did in one sentence what you failed to do in 10 paragraphs, including examples

I'm still waiting for a g964's kata with a human-readable description, but I'm losing hope at this point

As a wise man once said:

"What on Earth was the point of choosing this as an example? To rouse the political emotions of the readers and distract them from the main question? To make Republicans feel unwelcome in courses on Artificial Intelligence and discourage them from entering the field? (And no, I am not a Republican. Or a Democrat.)

Why would anyone pick such a distracting example to illustrate nonmonotonic reasoning? Probably because the author just couldn’t resist getting in a good, solid dig at those hated Greens. It feels so good to get in a hearty punch, y’know, it’s like trying to resist a chocolate cookie."

E.Yudkowsky, Politics is the Mind-Killer

You can use jsbench.me

This will fail with something like person.game.person. Because if no property is found, for some reason you set result back to this, and person.game.person transforms to this.person.

Coding: 0.1 minute
Boring copypasta and setting quotation marks: 15 minutes