Re:Ask HN: What are some cool but obscure data structures yo...
by xxs on Friday July 22, 2022 @03:36AM
(#32189520)
>Is (non-)determinism really the right concern here?
A massive one - there is a lot of code that implicitly depends on the order of iteration (think configurations/initialization). The issue might be invisible, and reproduce rarely in production only. The iteration order depends on the hash of the keys, plus the capacity of the underlying array.
In Java I advise to never use the standard HashMap in favor of LinkedHashMap. In cases where data density is important both are a terrible fit having nodes instead of a plain object array (and linear probe/search).
A massive one - there is a lot of code that implicitly depends on the order of iteration (think configurations/initialization). The issue might be invisible, and reproduce rarely in production only. The iteration order depends on the hash of the keys, plus the capacity of the underlying array.
In Java I advise to never use the standard HashMap in favor of LinkedHashMap. In cases where data density is important both are a terrible fit having nodes instead of a plain object array (and linear probe/search).