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+[[Rust]]
+
+It is basically redeclaring the same variable, but it can be redeclared with a **different type**. A immutable variable can also be shadowed.
+
+Shadowing is undone when the scope ends, for example in a closure I can shadow a variable from the parent scope, but in the parent scope after the child scope ends we have the original value not the one from the child scope.
+
+It is useful for reusing a name, ie:
+```rust
+let spaces = "    ";
+let spaces = spaces.len();
+```
+> the type of spaces changes from string to u32.