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rust@octodon.social ("Rust tips") wrote:

Converting a slice &[..] to a fixed-length array in #Rustlang

By copying:

let arr: [_; N] = slice.try_into().unwrap();

By reference:

let arr: &[_; N] = slice.first_chunk::<N>().unwrap();

Single element only:

let arr: &[_; 1] = std::array::from_ref(element);

If the slice length is obvious to the optimizer (e.g. chunks_exact() iterator), the unwrap() will be optimized out. Otherwise, handle possibility of the slice being too short.

There's more:

https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first_chunk