Neither let nor even const are immutable (const prevents reassignment but not mutation if the value is of a mutable type like object or array).
Neither let nor even const are immutable (const prevents reassignment but not mutation if the value is of a mutable type like object or array).
Yep, I believe you'd need to call Object.seal(foo) to prevent mutability. Haven't really had the chance to use it
Object.freeze is the one you're looking for.
const + Object.freeze is a lot to remember and cumbersome to use throughout a codebase, very relevant to Carmack's wish for immutability by default. I'm grateful Rust opted for that default.