Convoluted explanation. This is an 'unshift', not a 'push'. And with linked list, 'add' makes more sense.

How can someone know this?

This test: calculator(11, 15, 2).
How can the bus win in this case?
walkTime = 11/5 = 2.2;
busTime = 15/8 + 2/5 = 2.275;

Very clever. But can you explain, how you get this formula?

Can you explain this regex? /#1 (.+)\s/

So as far as I understand, the problem looks something like this
Step|Hands
1 | 1 0 0
2 | 2 0 0
3 | 0 1 0
4 | 1 2 0
5 | 2 0 1
6 | 0 1 2
7 | 1 2 3
Why is the 6th step in the example equal [0, 2, 0]?

Is this slower than a for loop?

If only German could be this easy...

We tried. But obviously not hard enough.

A hint about playing around with the built-in methods of Object would be nice