Function rand::seq::sample_slice

Important traits for Vec<u8>

impl Write for Vec<u8>

pub fn sample_slice<R: ?Sized, T>(
    rng: &mut R, 
    slice: &[T], 
    amount: usize
) -> Vec<T> where
    R: Rng,
    T: Clone, 

Randomly sample exactly amount values from slice.

The values are non-repeating and in random order.

This implementation uses O(amount) time and memory.

Panics if amount > slice.len()

Example

use rand::{thread_rng, seq};

let mut rng = thread_rng();
let values = vec![5, 6, 1, 3, 4, 6, 7];
println!("{:?}", seq::sample_slice(&mut rng, &values, 3));