What is the best way to replace a specific portion of a vector with a new vector?

As of now, I am using hardcoded code to replace the vector. What is the most effective way to achieve this?

fn main() {
    let mut v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
    
    let u = vec![0,0,0,0];

    v[2] = u[0];
    v[3] = u[1];
    v[4] = u[2];
    v[5] = u[3];
    

    println!("v = {:?}", v);
}

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Is there any function to replace the vector with given indices?

>Solution :

For Copy types:

v[2..][..u.len()].copy_from_slice(&u);

Playground.

For non-Copy types:

v.splice(2..2 + u.len(), u);

Playground.