How to prevent automatic sort of Object numeric property?

Question

Why I met this problem: I tried to solve an algorithm problem and I need to return the number which appeared most of the times in an array. Like [5,4,3,2,1,1] should return

Answer 1

I came across this same problem, and after search a lot about that, i found out that the solution to prevent this behavior is make key as string.

Like that:

{"a": 2, "b": 2}