RustBrock/Variables.md

Variables

• Are Immutable by default
• can be inferred but sometimes needs explicit typing

    let foo = 5;

• Need to add mut keyword to enable rewriting, generally avoid unless actually used

    let mut bar = 6;

SHADOWING

Cannot have mutable shadows

allows for reuse of namespace instead of spaces_str and spaces_num

    let spaces = " _ _ ";
    let spaces = spaces.len();
    // will output 5 instead of " _ _ " beacuse that is how long it is
    // the shadow of spaces (first) wont be printed until the overshadow of spaces goes out of scope
    println!("{spaces}"); // output: 5

not allowed shadow

    let mut spaces = " _ _ ";
    spaces = spaces.len();

cannot change type of variable once declared