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. Dec 22, 2025 · In this blog, we’ll demystify shadowing and mutability, break down their core differences, and explore when to use each. By the end, you’ll have a clear understanding of how these features work and how to leverage them to write cleaner, safer Rust code. In this lesson, you'll learn how Rust handles variables, when and how to make them mutable, the difference between variables and constants, and the powerful concept of shadowing.
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