Variables are immutable by default in Rust, but they're not const by default. The difference is that a variable can become mutable while a const is always immutable.
let foo = "1234".to_string();
let mut foo = foo;
foo = "5678";
This only works if you have ownership of the variable though. And in practice it's a pretty good compromise, because it's pretty hard to do this by mistake.
Note: const in rust is different to const in some other languages: it represents a value that is duplicated inline into each use site at compile time.
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I really wish Zig had followed Rust’s lead and made variables const by default :/
Variables are immutable by default in Rust, but they're not const by default. The difference is that a variable can become mutable while a const is always immutable.
How do you set a variable as mutable after the fact in rust?
You can do:
This only works if you have ownership of the variable though. And in practice it's a pretty good compromise, because it's pretty hard to do this by mistake.Note: const in rust is different to const in some other languages: it represents a value that is duplicated inline into each use site at compile time.
Yes I think i see it more like constexpr.