[Rust Guide] 6.3. The Match Control Flow Operator

In Rust, pattern matching is a powerful feature that allows you to destructure data and handle different cases based on the structure of the data. The wildcard _ is used in pattern matching to match any value without binding it to a variable name. This can be particularly useful when you want to cover all remaining possibilities after specifying specific ones.

Here's an example demonstrating how to use wildcards with match statements:

Example: Matching on a Random Number

Let's consider the provided code snippet where we generate a random number and match it against different cases using pattern matching. We'll use the wildcard _ for any value that isn't explicitly handled.

rust
 
1use rand::Rng;  // Use an external crate
2
3fn main() {
4    let v: u8 = rand::thread_rng().gen_range(0..=255);  // Generate a random number
5    println!("{} is generated", v);
6
7    match v {
8        0 => println!("zero"),
9        _ => println!("not zero"),  // Use the wildcard `_` for all other cases
10    }
11}

Explanation

1. Generating Random Number:

   rust
    
   1let v: u8 = rand::

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