How to declare arrays gracefully [Vec<String>;8]

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This is how I deal with it.

    let mut array = [vec![], vec![], vec![], vec![], vec![], vec![], vec![], vec![]];

But I think it's ugly.Who can write it better?

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use from_fn in std::array - Rust

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As @zirconium-n said, the general solution is using from_fn.

An alternative that works on older compiler is to use a const:

const EMPTY_VEC: Vec<String> = Vec::new();
let mut array = [EMPTY_VEC; 8];

The downside of this approach is that it works only for values you can const initialize, however it also guarantees you won't do work at runtime for it.

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Fine, thank you

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