rust / beginner
Snippet
Result Type for Error Propagation
Result<T, E> is Rust's way of handling operations that can fail. Unlike Option<T> which represents potentially missing values, Result represents operations that can fail with an error. The Ok variant holds the success value, while Err holds error information.
snippet.rs
rust
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fn divide(a: f64, b: f64) -> Result<f64, String> {if b == 0.0 {return Err(String::from("Division by zero"));}Ok(a / b)}fn main() {match divide(10.0, 2.0) {Ok(result) => println!("Result: {}", result),Err(e) => println!("Error: {}", e),}let result = divide(5.0, 0.0).unwrap_or(-1.0);println!("Safe result: {}", result);}
Breakdown
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Result<f64, String>
Return type indicating success (f64) or failure (String error)
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return Err(String::from(...));
Returns an error wrapped in the Err variant
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.unwrap_or(-1.0)
Extracts value or returns default if Err