• Flipper@feddit.de
    12·
    1 year ago

    Other languages: if a is null return b.

    Rust: here is an array of strings, we are going to parse the array to numbers. If that conversion fails we handle the exception and return the minimum integer value. We then save the result in a new vector. We also print it.

    I like rust, but I hate the example too. It’s needlessly complex. Should have just been a.unwrap_or(b).

    • mea_rah@lemmy.world
      3·
      1 year ago

      The example even used unwrap_or_else where they should use unwrap_or. Then it uses std::i64::MIN as fallback value where they could use something like 0 that would be a better example and honestly make more sense there.

      let parsed_numbers = ["1", "not a number", "3"]
    .iter()
    .map(|n| n.parse().unwrap_or(0))
    .collect();

// prints "[1, 0, 3]"
println!("{:?}", parsed_numbers);

      Even without trimming this to something less convoluted, the same functionality (with different fallback value) could be written in more readable form.

      Obviously in the context of the page something like this would make way more sense:

      maybe_number.unwrap_or(0)

      Or perhaps more idiomatic version of the above:

      maybe_number.unwrap_or_default()