Announcing Rust 1.76.0 | Rust Blog
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  • anlumo@feddit.deEnglish
    182·
    9 months ago

    Oh, inspect has finally arrived! That will help a ton with debug logging.

      • anlumo@feddit.deEnglish
        142·
        9 months ago
        let bar: Result<T, E> = ...;
let foo = bar.inspect(|value| log::debug("{}", value));

        is equivalent to

        let bar: Result<T, E> = ...;
let foo = bar.map(|value| {
    log::debug("{}", value);
    value
});
      • GissaMittJobb@lemmy.ml
        2·
        9 months ago

        Looks vaguely like Stream::peek from Java, I think? There’s an equivalent method in Iterator::inspect.

      • owsei@programming.dev
        1·
        9 months ago

        it’s just a way to use map with a reference instead of the value, by what I understood.

        could be usefull for logging values in a Result so you can see it. However I think you can already do that by just mapping and returning the variable.