javascript get n random elements from array

1// Shuffle array
2const shuffled = array.sort(() => 0.5 - Math.random());
3
4// Get sub-array of first n elements after shuffled
5let selected = shuffled.slice(0, n);
6

1function getRandom(arr, n) {
2    var result = new Array(n),
3        len = arr.length,
4        taken = new Array(len);
5    if (n > len)
6        throw new RangeError("getRandom: more elements taken than available");
7    while (n--) {
8        var x = Math.floor(Math.random() * len);
9        result[n] = arr[x in taken ? taken[x] : x];
10        taken[x] = --len in taken ? taken[len] : len;
11    }
12    return result;
13}