Nodejs Utililty Methods Array Sample

Array.prototype.sample = function(){
  return this[Math.floor(Math.random()*this.length)];

Array.prototype.sample = function() {
  var rand_position = parseInt(Math.random() * this.length);
  return this[rand_position];
};

Array.prototype.sample = function() {
    return this[Math.floor(Math.random() * this.length)];
};
function Duck(color){
  this.type = color;
  this.quack = function() {
    console.log(["Quacksicles!","Quacktacular!","That's so QUACK!"].sample());
  };
var redDuck = new Duck("red");
var yellowDuck = new Duck("yellow");
console.log("The " + redDuck.type + " duck says: ");
redDuck.quack();
console.log("The " + yellowDuck.type + " duck says: ");
yellowDuck.quack();

Array.prototype.sample = function() {
    function getRandomInt(min, max) {
        return Math.floor(Math.random() * (max - min)) + min;
    return this[getRandomInt(0, this.length)];

Array.prototype.sample = function(n) {
  const result = [...this];
  const count = Math.min(n, result.length);
  for (let i = 0 ; i < count ; i++) {
    const x = Math.floor(Math.random() * result.length);
    [result[i], result[x]] = [result[x], result[i]];
  return result.slice(0, count);
const generate = () =>
  Array(45).fill()
           .map((_, i) => i + 1)
           .sample(6)
           .sort((x, y) => x - y)
           .join(', ');
console.log(generate());

"use strict";
Array.prototype.sample = function (n) {
  var randNum, dupe, result;
  if (arguments.length === 0) {
    result = this[Math.floor(Math.random()*this.length)];
  } else if (parseInt(n) !== n) {
    throw TypeError("argument must be a number");
  } else if (n <= 0) {
    throw RangeError("argument must greater than zero");
...

Array.prototype.sample = function(n) {
  const result = this.slice();
  const count = Math.min(n, result.length);
  for (let i = 0 ; i < count ; i++) {
    const x = Math.floor(Math.random() * result.length);
    const temp = result[i];
    result[i] = result[x];
    result[x] = temp;
  return result.slice(0, count);

Array.prototype.sample = function(n){
  if (typeof n == "undefined") n = 1
  results = []
  for (var i = 0; i < n; i++){
    results.push(this[Math.floor(Math.random()*this.length)])
  return results