CODEWITHSUNDEEP
rustiterationfilter-map
fadedbee
fadedbee

Reputation: 44739

How to convert a Result into an Option inside iterator chain?

I've written this:

    /* Turn a Vec<Vec<u8>> into a Vec<String>, without re-allocating the inner bytes. */
    let lines: Vec<String> = u8_lines.into_iter()
        .filter_map(|u8_line| match String::from_utf8(u8_line) {
                Ok(u8_line) => Some(u8_line),
                Err(_) => None,
        })
        .collect();

Is there a way of simplifying this by replacing the match or the filter_map?

Upvotes: 0

Views: 116

Answers (1)

Freyja
Freyja

Reputation: 40804

Use can use Result::ok to turn a Result<T, E> into an Option<T>:

    /* Turn a Vec<Vec<u8>> into a Vec<String>, without re-allocating the inner bytes. */
    let lines: Vec<String> = u8_lines.into_iter()
        .filter_map(|u8_line| String::from_utf8(u8_line).ok())
        .collect();

Upvotes: 2

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