Julia has a big culture and a lot of interfaces built around writing non-allocating code. We sometimes even overemphasize eliminating GC allocations from stuff.

Generally, the code ends up looking rather similar to non-GC languages. You create some buffers outside of your performance-sensitive parts, and then thread them through your code so they can be accessed and re-used in the hot loop or whatever.

It could be better, e.g. C++ and Rust both have some nice utilities for this stuff that are a bit hard to replicate in Julia, but it's not auch a huge difference, and there's also a lot of advantages on the julia side.

E.g. it's really nice to have the GC available for the non-performance critical parts of your code.