Shadowing in Rust

While Rust comes with strict static typing, surprisingly it supports the concept of Shadowing for types. Shadowing allows variable that was once declared as one type to be redeclared as a new type. In effect, shadowing or overwriting the previous declaration.

Let's take a quick look at Shadowing in Rust. Here's an example of the beginner's favorite guessing game example.

Take a look at line number 10 and 15, and observe that the variable guess is declared. First time as a mutable string, and then as an immutable unsigned 32-bit integer.

Shadowing lets us re-use the guess name, rather than forcing us to come up with two unique names like guess_str and guess, or something else.