Rust Variables

Dynamic Type Annotation

let x = 42;

Explicit Type Annotation

let x : i32 = 42;

Thrown Variables

Variables that have their values thrown away immediately after.

// throw away the result of somefunc()
let _ = somefunc();

Mutability

By default, all variables in rust are immutable. To make something mutable you must use the mut keyword.

let mut doorstatus = false;
doorstatus = true;