2
Review
Your code is a good simple solution. The style is sloppy. The complexity is a bit high and the techniques uses are negatively impacting performance.
The template literal call Array.split`+` always throws me, but I like it, your code reminds me to use it more often.
General points
Delimit all code blocks. Eg if(n==0) return ["0"] better ...
1
Your code does not perform very well, I suppose because of the double recursion within the f-method.
It lacks readability: let's say you return to this code a year later: how long would it take to understand what you actually wanted to do?
Always use strict equality comparison (n == 0 => n === 0).
Readability can at least be enhanced by interpunction, ...
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