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. 1 day ago · 3.1.2 Variables and Constants Many people who start learning Rust cannot clearly distinguish between immutable variables and constants (constant). Although constants are also immutable once assigned, they differ significantly from immutable variables: Constants cannot use mut; once declared, they are immutable. Sep 2, 2025 · 🤯 Ever wondered why Rust is so strict about variables? Learn how the 'let' and 'mut' keywords work, understand Rust's unique memory model, and discover the power of shadowing.
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