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Creating an array with the same value

fn main() {
    let counter = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
    println!("{} {:?}", counter.len(), counter);

    let counter = [0; 10];
    println!("{} {:?}", counter.len(), counter);

    let answer = [42; 4];
    println!("{} {:?}", answer.len(), answer);
}
10 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
10 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
4 [42, 42, 42, 42]