You have described two different data structures: Array and HashMap. Both of them has their own pros and cons. While [lookup] operation in hashmap is faster, hashmap is unordered data structure. It means that there is no guarantee that keys in let objects will be rendered/returned in expected order. It depends on js engine and not on js specification.
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You have described two different data structures: Array and HashMap. Both of them has their own pros and cons. While [lookup] operation in hashmap is faster, hashmap is unordered data structure. It means that there is no guarantee that keys in
let objectswill be rendered/returned in expected order. It depends on js engine and not on js specification.