Review DOM Manipulation by Building a Rock, Paper, Scissors Game - Step 1

Tell us what’s happening:

I tried using Math.random(optionsn) or Math.floor(options), but it says that the function should return a string. I tried these: String(Math.random(options)), String(Math.floor(options)).

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Rock, Paper, Scissors game</title>
    <link rel="stylesheet" href="./styles.css" />
    <h1>Let's play Rock, Paper, Scissors!</h1>
      <details class="rules-container">
        <summary>Rules to the game</summary>

        <p>You will be playing against the computer.</p>
        <p>You can choose between Rock, Paper, and Scissors.</p>
        <p>The first one to three points wins.</p>

        <p>Here are the rules to getting a point in the game:</p>
          <li>Rock beats Scissors</li>
          <li>Scissors beats Paper</li>
          <li>Paper beats Rock</li>
          If the player and computer choose the same option (Ex. Paper and
          Paper), then no one gets the point.

      <div class="score-container">
          >Player Score: <span class="score" id="player-score">0</span></strong
          >Computer Score:
          <span class="score" id="computer-score">0</span></strong

      <section class="options-container">
        <h2>Choose an option:</h2>
        <div class="btn-container">
          <button id="rock-btn" class="btn">Rock</button>
          <button id="paper-btn" class="btn">Paper</button>
          <button id="scissors-btn" class="btn">Scissors</button>

      <div class="results-container">
        <p id="results-msg"></p>
        <p id="winner-msg"></p>
        <button class="btn" id="reset-game-btn">Play again?</button>
    <script src="./script.js"></script>

/* file: styles.css */
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;

:root {
  --very-dark-blue: #0a0a23;
  --white: #ffffff;
  --yellow: #f1be32;
  --golden-yellow: #feac32;

body {
  background-color: var(--very-dark-blue);
  text-align: center;
  color: var(--white);

h1 {
  margin: 15px 0 20px;

.btn {
  cursor: pointer;
  width: 100px;
  margin: 10px;
  color: var(--very-dark-blue);
  background-color: var(--golden-yellow);
  background-image: linear-gradient(#fecc4c, #ffac33);
  border-color: var(--golden-yellow);
  border-width: 3px;

.btn:hover {
  background-image: linear-gradient(#ffcc4c, #f89808);

.rules-container {
  padding: 10px 0;
  margin: auto;
  border-radius: 15px;
  border: 5px solid var(--yellow);
  background-color: var(--white);
  color: var(--very-dark-blue);

.rules-container ul {
  list-style-type: none;

.rules-container p {
  margin: 10px 0;

@media (min-width: 760px) {
  .rules-container {
    width: 60%;

.score-container {
  display: flex;
  justify-content: space-around;
  margin: 30px 0;
  font-size: 1.2rem;

.score {
  font-weight: 500;

.results-container {
  font-size: 1.3rem;
  margin: 15px 0;

#winner-msg {
  margin-top: 25px;

#reset-game-btn {
  display: none;
  margin: 20px auto;

/* file: script.js */

// User Editable Region

function getRandomComputerResult() {
  const options = ["Rock", "Paper", "Scissors"];
  return Math.floor(options);

// User Editable Region

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

Challenge Information:

Review DOM Manipulation by Building a Rock, Paper, Scissors Game - Step 1


Math.floor() takes a number and returns the largest integer less than or equal to that number. Math.random() returns a random number between 0 and 1. options is an array. Your approach is completely wrong. You can get a number from an array, but not in that way. Check this documentation and try to remember what an array is and how it works.

Also challenge tips are very clear and helpfull;


  • You can use Math.random() and Math.floor() to help you get a random whole number. This will represent the index number for the options array.
  • You can use the random index to access the option from the options array.

I finally figured it out.

I guess this reply will help future students who visit through this link. The solution is to find a random number 0 or 1 which will be used AS an INDEX for the options array. To do that we have to first access the array by options; then use Math random and Math floor to find a random whole number 0 or 1. Thanks