Web Reference: Let’s explore how and why Rust encourages you to favor immutability and why sometimes you might want to opt out. When a variable is immutable, once a value is bound to a name, you can’t change that value. May 28, 2025 · In Rust, variables are declared using let. By default, all variables are immutable, which means you cannot change their values. To make a variable mutable, add mut like this: let mut x = 5. This is different from JavaScript, where variables are often mutable by default. Jan 18, 2025 · Understanding how to declare and work with immutable and mutable variables is fundamental for writing safe and efficient Rust code. In this article, we will explore the differences between immutable and mutable variables in Rust, and how they affect your program’s behavior.
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