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.
rust1use 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
- Generating Random Number:
rust
1let v: u8 = rand::
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