Is Julia's `hash()` function guaranteed to have a stable output across sessions, platforms and versions?

user_38626 0
Viewed 179

I tried running the following code in multiple different Julia REPL sessions, on MacOSX and Linux, and I always got the exact same outputs:

julia> hash(123), hash("123"), hash([1,2,3]), hash((1,2,3)), hash(Set([1,2,3])), hash(:123)
(0x54657e9dbfd649e5, 0xb4e92987fa06fcab, 0xecc5186e7be222c6, 0xafc764e9c2b7cde5, 0x66406071c4c9b92a,
0x54657e9dbfd649e5)

Question: is this behavior guaranteed by the language? Or can the outputs vary (like they do in Python, across sessions, platforms and versions)?

Note: this question is related to my other question about the stability of the order of hash-based collections such as Set and Dict (it's closely related, but different).

julia
1 Answers

They are not stable and can change from version to version or platforms. They are already different between systems with different word sizes.

user_6592480
Related