For example?

Depends on the situation and constraints

is fmt.Sprintf a good way to save a value?

Actually, your solution is DRY in the runtime sense but the solution above is actually more DRY in terms of code since you don't have to repeat certain things.

nasty!

Broooo!

which is why this is predominantly voted a clever solution

I hope you know what a sense of humor is

There are too many things wrong with this translation to run the risk of it being approved by accident, hence the rejection.

You don't have random tests and you have initial code in Preloaded. Please read documentation, read tests and preloaded on other TS kata, and next time please make sure to ask for a thorough review from a reviewer that's fluent in TypeScript ( which I'm not ). You may have made mistakes I did not point out ( or even notice ).

This translation can never be unrejected, but you can still fork it to start improving it. Pay particular attention to the description; LC has modified it in the meantime and changes will have to be merged correctly ( just copy the current description from the kata editor ).

Missing space after '#' comment lines

mutating the original input object doesn't look like a good idea...