Is there an easier way to fill remaining slots of a vector?

I have a vector that will have a maximum capacity of 256, and sometimes the full capacity will be filled with values, and sometimes some of it will be empty. I know I can use a simple loop to push values on like:

    let mut v: Vec<u8> = String::from("test string").as_bytes().to_vec();
    for _i in v.len() .. 256 {

but, is this the most efficient way of doing this?


Vec::resize or Vec::resize_with.

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