Shadowing Variables In Scope

Shadowing a variable only applies to the scope that the shadowing happens in. If you bind a variable in one scope, then shadow it in a child scope the new version of the variable will be used in that scope. For example:

fn main() {
  let alfa = 3;
  println!("The value is {alfa}");

  {
    let alfa = 5;
    println!("The value is {alfa}");
  }

}

The value is 3
The value is 5

If you then exist the child scope and use the variable name in the original scope it returns to the original version.

fn main() {
  let alfa = 3;
  println!("The value is {alfa}");

  {
    let alfa = 5;
    println!("The value is {alfa}");
  }

  println!("The value is {alfa}");
}

Enter this program and run it to see the output.

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