Immutability

If you are coming to Rust from languages like Python, JavaScript, or C++, you are used to variables acting exactly as their name implies: they vary. You declare a variable, assign it a value, and change that value whenever the program’s logic dictates. Rust takes a different, highly intentional approach. In Rust, variables are immutable by default. Once a value is bound to a name, you cannot change it. This might feel restrictive at first, but it is one of the foundational design choices that allows Rust to guarantee memory safety and thread safety without sacrificing speed. Let’s explore how variables work in Rust, why immutability is the default, and how to safely bypass it when you need to. ...