Python-esque for-else construct for Rust
The for-else library introduces two procedural macros, for_! and else_!, that extend the capabilities of the standard looping mechanism. By pairing these two together, you can specify code that should be executed only if the loop completes without hitting a break statement.
First, add the dependency to your Cargo.toml:
cargo add for-else
Then, use the macros in your code:
``` use forelse::{for, else_};
// not the best way to test primality, just for demonstration fn is_prime(n: u32) -> bool { if n <= 1 { return false; } for i in 2..n { if n % i == 0 { return false; } } true }
for! { n in 2100..=2110 { if isprime(n) { println!("Found a prime number: {}", n); break; } }} else_! { println!("No prime numbers found in the range."); }
```
In this example, the program searches for the first prime number in the range [2100, 2110]. If a prime is found, it prints the number. If no prime is found, the else_! block executes, notifying the user.
For detailed information on each macro and its behavior, please refer to the documentation
Contributions are always welcome! Please open an issue or submit a pull request.