Web Reference: Although variables are immutable by default, you can make them mutable by adding mut in front of the variable name as you did in Chapter 2. Adding mut also conveys intent to future readers of the code by indicating that other parts of the code will be changing this variable’s value. 5 days ago · This article details the declaration and usage of variables in Rust, including immutable variables, mutable variables, type inference, scope, and ownership rules. Rust's approach to variables is unique - variables are immutable by default. This design choice helps prevent bugs and makes code easier to reason about. By default, variables in Rust are immutable: let x = 5; println!("The value of x is: {}", x); // This will cause a compile error: // x = 6; // Error: cannot assign twice to immutable variable.
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