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並前往https://www.qi-u.com/?qa=856939/vector-how-can-i-take-an-item-from-a-vec-in-rust

vector - How can I take an item from a Vec in Rust? - Qi-U Q&A ...

You can write your function like this: fn take<T>(mut vec: Vec<T>, index: usize) -> Option<T> { if vec.get(index).is_none() { None } else ...

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