Variables

John Carmack Discusses Mutable Variables

John Carmack discusses the benefits of immutability in programming, highlighting how it simplifies reasoning about code, improves safety, and enables better concurrency and debugging. He contrasts immutable variables with mutable ones, emphasizing that immutability makes code more predictable and easier to understand, especially in functional programming languages like Clojure and Haskell. The discussion also touches on language features like 'const' in JavaScript and Rust, and the cultural and practical reasons why mutability remains prevalent in many languages.