They're not very different in that arrays can be thought of as a more specialized form of tuples that can thus coerce to slices. In theory, arrays do not need

They're not very different in that arrays can be thought of as a more specialized form of tuples that can thus coerce to slices. In theory, arrays do not need to exist, and could in theory be expressed as tuples, but that would lead to rather unpleasant syntax. `(A, A, A, A, A, A, A, A, A, A)` is certainly not as nice as `[A; 10]`; — Rust could even have chosen to make the latter syntactic sugar for the former and make them interchangeable. The crux to this, is that in Rust, unlike in many other languages, the length of an array is static and known at compile time. Many languages lack such a datatype, as it isn't strictly needed per the aforementioned reasons.