Rust Shadowing

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Index

1. Definition
2. Variable re-declared in a different scope
3. Variable re-declares in the same scope

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Definition

Shadowing allows a variable to be re-declared in the same scope with the same name

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Variable re-declared in a different scope

• when we exit the scope the original variable stay intact

let x = 5;
{
	let x = "ciao";
	println!("{x}"); // Output: ciao
}
 
println!("{x}");     // Output: 5

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Variable re-declares in the same scope

• The original variable it’s overwritten by the new one

let x = 5;
println!("{x}"); // Output: 5
    
let x = "ciao";
println!("{x}"); // Output: ciao

Nota:

We are not mutating the original variable but we a declaaring a new variable we the same name of the old one

Example of re-declaration:

let x = 5;
let x = "Hello";

Example of mutation:

let mut x = 5;
x = 6;

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