Nodejs Array Sample sample(n)

Method Source Code

"use strict";/*from   www  .ja  v a 2s .  com*/

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");
  } else {
    n = n > this.length ? this.length : n;
    dupe = this.slice();
    result = [];
    for(var i=0; i<n; i++) {
      randNum = Math.floor(Math.random()*dupe.length);
      result.push(dupe[randNum]);
      dupe.splice(randNum, 1);
    }
  }
  return result;
};

Related

1. sample()

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

2. sample()

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

3. sample()

   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();
   

4. sample()

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

5. sample(n)

   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());
   

6. sample(n)

   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);
   

7. sample(n)

   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