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rustoption-type

Is there a more elegant way to unwrap an Option<Cookie> with a default string?

I want to unwrap the cookie or return an empty &str when is None:

let cookie: Option<Cookie> = req.cookie("timezone");

// right, but foolish:
let timezone: String = match cookie {
    Some(t) => t.value().to_string(),
    None => "".into(),
};

This is an error:

let timezone = cookie.unwrap_or("").value();
Solution

  • You can use unwrap_or_default plus map, what you want is to extract a String value, and if it cannot be done just have a default one. Order matters:

    let timezone: String = cookie.map(|c| c.value().to_string()).unwrap_or_default();

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