Any ways to run the Ok branch if the result gives Err when matching

May 21, 2024

I have a match branch that theoretically resolves the Error (if I do have one) condition, which then I would want to execute whatever code I’ve written in the Ok() branch above.

Is it possible to do that in Rust?

Example:

let foo: Result<Bar, Error> = some_func();
match foo {
    Ok(bar) => { Something happens here }
    Err(e) => { Resolves error, and execute the Ok() case above }
}

>Solution :

You can use unwrap_or_else to handle errors and replace them with a new bar. Then put the Ok code below it where you’re guaranteed to have a bar.

let foo: Result<Bar, Error> = some_func();
let bar = foo.unwrap_or_else(|e| {
    // Resolve the error and return a replacement `bar`.
    new_bar
});
// Proceed with `bar`.