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A variable is immutable by default in Rust, eg let x = 3; // its value can't be changed
Use the mut keyword before its name to make it mutable, eg let mut x = 3;
A Constants is immutable always, and the type of the value must be annotated eg const PI: u32 = 3.14
Constants can be set only to a constant expression, not the result of a function call or any other value that could only be computed at runtime.
A variable shadowed can be changed type of the value also, eg
let s: u32 = 1;
let s: u32 = 2; // shadow but change the value only
let s: &str = "s"; // shadow and change the type of the variable
...
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A variable is immutable by default
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The
mutkeyword to make it mutable -
Constants can be set only to a constant expression
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Shadowing to change the type and value of a previous variable
Variables and Mutability in The Rust Programming Language
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Table of Doc contents in here