Answers for "javascript select n random elements from list"

how to get a randome element from a list in javascript

let numList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let randomElem = numList[Math.floor(Math.random() * numList.length)];
console.log(randomElem);

javascript select n random from array

function getRandom(arr, n) {
    var result = new Array(n),
        len = arr.length,
        taken = new Array(len);
    if (n > len)
        throw new RangeError("getRandom: more elements taken than available");
    while (n--) {
        var x = Math.floor(Math.random() * len);
        result[n] = arr[x in taken ? taken[x] : x];
        taken[x] = --len in taken ? taken[len] : len;
    }
    return result;
}