Michael Jude Larocca

JavaScriptmas 2023 - Week 2

Published on December 11, 2023

Tis the season! JavaScriptmas is here again! JavaScriptmas is a FREE annual festive coding event hosted by the online coding school Scrimba, consisting of 24 daily coding challenges, prizes, and more!


JavaScriptmas 2023

What is JavaScriptmas?

JavaScriptmas is aย FREEย annual event comprising 24 coding challenges hosted by the online coding school Scrimba. Most of the coding challenges are JavaScript, but this year, there will be a few CSS challenges, and some using AI tools! ๐ŸŽ„

What level of coder do you need to be to participate?

Even if you are starting to learn JavaScript, you can participate. For hints, you can tap into the community, and of course, you can always use Google to help you get to your solution. There will also be Discord channels for the challenges, as well as for FAQs. You can also check out the topic in Scrimba's forum. ๐Ÿ’ป

JavaScriptmas prize rules

  1. Each day, you can complete the challenge by midnight UTC, and share your VALID/working solution on Twitter/X for a chance to win a prize! (You can easily post your submission via the share solution button on your Scrim).
  2. Take part in Santa's Code Review Workshop by picking a JavaScriptmas entry on X/Twitter, doing a code review, and sharing it as a reply post.
  3. Attend the JavaScriptmas YouTube Livestream on Dec 24 for a chance to win a Mackbook Air M2

JavaScriptmas prizes

The prizes consist of 24 Annual Scrimba Pro subscriptions worth $200, 5 $100 winners for giving a code review of another participant's entry, and a grand prize winner awarded a Mackbook Air M2 worth $1,100! All winners will be announced during the JavaScriptmas YouTube Livestream event on December 24th. ๐ŸŽ

JavaScriptmas savings

In addition to prizes, be on the lookout for savings with discount prices on their paid courses! If you're interested in taking a paid course from Scrimba, be sure to use the discount code provided: (Valid for an additional 10% off semester and annual plans. Expires on July 31st, 2024) ๐Ÿ’ธ

Note: Prizes are limited to one per person

โ„Community highlightsโ„

In the spirit of the festive holiday season, I enjoy featuring others' works in the community highlights section of my JavaScriptmas articles! I will be searching X/Twitter, LinkedIn, and the Scrimba Discord channel for "outstanding" submissions by fellow participants to feature! ๐ŸŽ‰

My solutions

Throughout the JavaScriptmas event, I will participate in all 24 coding challenges and document my detailed solutions! ๐Ÿ’ป

โ„Community highlightsโ„ โฌ‡

Alina (@disc0night)


Alina tackled the Jeopardy Card Flip challenge with flair, designing it to resemble the actual Jeopardy game board! This creative touch greatly enhanced the flipping card effect, making the project feel like you're watching or even participating in a real game of Jeopardy! Excellent work, Alina!

๐Ÿ”— Link to the scrim

Wojciech Kasprzak (@kawojtek94)


Wojciech took creative liberty for the Rockin' Around jukebox challenge and created a working vinyl record player instead! Choose the vinyl record you want to listen to and click on the tonearm. The tonearm moves onto the record using CSS animation, and the vinyl record selected plays! Click on the tonearm again to stop the music, and watch it animate off the record to its resting position. You can then continue to select and play the other vinyl records. Great job, Wojciech!

๐Ÿ”— Link to the scrim

Austin Edmondson


While searching for JavaScriptmas participant posts on social media, I came across Austin's posted solution on LinkedIn. What caught my attention was his unique method of sharing his coding solutions. Instead of posting a link to the finished coding solution as others do, Austin is creating Scrimba screencasts, in which he records himself discussing his entire thought process as he tackles each challenge. This approach results in valuable resources for those seeking step-by-step guidance from a coding instructor. What an excellent way to share coding solutions! Fantastic work, Austin!

๐Ÿ”— Link to the scrim

My coding solutions โฌ‡

Day 4: AI Christmas E-card Generator


  • Use AI to generate a Christmas joke.
  • Display the joke in the DOM.


๐Ÿ”— My solution for day 4

This code uses the Hugging Face Inference API to generate a Christmas joke and display it in the document.

The HfInference class from the @huggingface/inference package is imported at the beginning. An instance of HfInference is created with the API key stored in the environment variable process.env.HUGGING_FACE_API_KEY.

A reference to the HTML element with the class name 'joke-display' is stored in the displayEl variable.

An event listener is added to the HTML element with the id 'window-container'. When this element is clicked, the following actions are performed:

  1. The text content of the 'joke-display' element is set to 'Loading...'.
  2. The styles of the 'left-door' and 'right-door' elements are updated to trigger CSS animations that open the doors.
  3. The style of the 'joke-display' element is updated to trigger a CSS animation that displays the joke.
  4. The textGeneration method of the HfInference instance is called. This method generates a text based on the provided model and inputs. The inputs are set to a string that prompts the model to generate a Christmas joke. The temperature option is set to 0.7, which controls the randomness of the output. A lower temperature results in more focused and consistent output, while a higher temperature results in more diverse and surprising output.
  5. The use_cache option is set to false to ensure that the generated text is not cached and is different each time the function is called.
  6. The generated text is set as the text content of the 'joke-display' element.

This script provides a fun and interactive way to generate Christmas jokes using AI. (However, I don't quite get the joke! "The Christmas tree is a very good tree" ๐Ÿ˜‚)

import { HfInference } from '@huggingface/inference';
const hf = new HfInference(process.env.HUGGING_FACE_API_KEY);
const displayEl = document.querySelector('.joke-display');

document.getElementById('window-container').addEventListener('click', async function () {
    displayEl.innerText = 'Loading...';

    document.querySelector('.left-door').style = "animation: left-open 0.3s forwards";
    document.querySelector('.right-door').style = "animation: right-open 0.3s forwards";
    document.querySelector('.joke-display').style = "animation: display-joke 0.3s forwards";

    const response = await hf.textGeneration({
        model: 'google/flan-t5-xxl',
        inputs: `Q: Give me a Christmas joke.`,
        temperature: 0.7,
    }, {
        use_cache: false

    displayEl.innerText = response.generated_text;

Day 5: Jeopardy Card Flip


  • The card has two sides and flips front to back on hover
  • Match styles as closely as possible
  • CSS only


๐Ÿ”— My solution for day 5

This CSS code is used to create a flipping card effect on a webpage. It uses several CSS properties to achieve this effect.

The body and html styles are used to center the card on the page, set the background color, and specify the font color and type.

The :root selector is used to define CSS variables which can be used throughout the document. In this case, it sets the colors for the card and font.

The .card class sets the size and position of the card. The perspective property gives the card a 3D effect when it flips.

The .card-front and .card-back classes are used to style the front and back of the card. The backface-visibility property hides the back of the card when it's not flipped. The transform-style property is used to preserve the 3D position of the card when it flips. The transition property creates the flipping animation.

The transform property in .card-back class initially rotates the back of the card by 180 degrees, hiding it from view.

When the card is hovered over, the .card:hover .card-front and .card:hover .card-back styles rotate the card to show the back of the card and hide the front, creating the flipping card effect.

body, html { 
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: var(--jeopardy-blue);
  color: var(--font-color-main);
  font-family: Arial, sans-serif;

:root {
  --jeopardy-blue: #060CE9;
  --font-color-main: #fff;

.card {
  position: relative;
  width: 300px;
  height: 200px;
  perspective: 1000px;

.card-front, .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  box-sizing: border-box;
  border: 1px solid var(--font-color-main);
  border-radius: 10px;
  transition: transform 0.8s;
  transform-style: preserve-3d;

.card-front {
  background-color: var(--jeopardy-blue);

.card-back {
  background-color: var(--font-color-main);
  color: var(--jeopardy-blue);
  transform: rotateY(180deg);

.card:hover .card-front {
  transform: rotateY(180deg);

.card:hover .card-back {
  transform: rotateY(360deg);

Day 6: Secret Santa


Write a function to randomly assign each person in an array a "Secret Santa," who is someone else in the array. No one should be assigned to themselves as their own Secret Santa.

{Bob: "Carly", Carly: "Alice", Alice: "Dan", Dan: "Ed", Ed: "Ferdinand", Ferdinand: "Ginny", Ginny: "Bob"}

๐Ÿ”— My solution for day 6

This function, generateSecretSantaPairs, is designed to organize a Secret Santa gift exchange. It accepts an array of people's names.

  1. First, it shuffles the array of names. This is done by swapping each name with another randomly selected name from the array. This ensures that the assignment of Secret Santas is random.
  2. Then, it creates an empty object, pairs, where we will store the final pairs of people and their Secret Santas.
  3. Next, it loops through the shuffled array of names. For each name, it assigns the next name in the array as their Secret Santa and stores this pair in the pairs object. For example, the first person gets the second person as their Secret Santa, the second person gets the third, and so on.
  4. When it reaches the last person in the array, it assigns them the first person as their Secret Santa. This is what we call "circular assignment".
  5. Finally, it outputs the pairs object which contains the pairs of people and their Secret Santas.

This function ensures that everyone gets a unique Secret Santa and no one is left without a gift. It's a fun and fair way to organize a Secret Santa gift exchange!

const people = ["Alice", "Bob", "Carly", "Dan", "Ed", "Ferdinand", "Ginny"]

function generateSecretSantaPairs(arr) {
    // Shuffle array
    for (let i = arr.length - 1; i > 0; i--) {
        let j = Math.floor(Math.random() * (i + 1));
        [arr[i], arr[j]] = [arr[j], arr[i]];

    let pairs = {};

    // Circular assignment
    for(let i = 0; i < arr.length; i++) {
        if(i === arr.length - 1) {
            pairs[arr[i]] = arr[0];
        } else {
            pairs[arr[i]] = arr[i + 1];

    return pairs;


Day 7: Christmas Present Wishlist


  • Iterate over the wishlist array.
  • Dynamically render your wishlist from the array.
  • Style the wishlist with CSS.


๐Ÿ”— My solution for day 7

This JavaScript code is used to dynamically generate a wishlist on a webpage. It consists of an array of wishlist items and a JavaScript function that creates and appends these items to the webpage.

The wishlist array contains five items that you wish for. These items are strings and represent the names of the gifts you want.

The wishlistItems constant is a collection of all HTML elements with the class name "wishlist".

The wishlist.forEach loop goes through each item in the wishlist array. For each item, it does the following:

  1. Creates a new li element using document.createElement("li").
  2. Sets the text content of this li element to the current item in the array.
  3. Adds the class "wishlist-item" to the li element.
  4. Appends this li element to the first element in the wishlistItems collection.

By the end of the loop, each item in the wishlist array is transformed into an li element and added to the webpage.

const wishlist = [
  "ATARI 2600+ Console",
  "Stack of Atari 2600 games",
  "Classic Atari T-Shirt",
  "Walkman with Retro Mixtapes",
  "Board Game Twilight Imperium",

const wishlistItems = document.getElementsByClassName("wishlist");

  const listItem = document.createElement("li");
  listItem.textContent = item;
  listItem.classList = "wishlist-item";

The following CSS code block styles a webpage with a wishlist.

The body selector styles the entire webpage. It sets the body to fill the entire height of the viewport (100vh). The display: flex, justify-content: center, and align-items: center properties center the content both vertically and horizontally. The background property sets a background image that covers the entire body.

The .wishlist selector styles a block element. It sets the width to 300px, adds a dotted border, and a box shadow for a 3D effect.

The .wishlist-item selector styles each item in the wishlist. It sets the color to white, centers the text, and makes the text bold. It also uses flexbox to center the content within each list item.

The .wishlist-item:nth-child(odd) and .wishlist-item:nth-child(even) selectors add a red and green background color to odd and even-numbered list items, respectively.

body {
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-family: 'Mountains of Christmas', serif;
    font-size: 20px;
    text-shadow: 2px 2px 2px red, -2px -2px 1px black;
    color: blanchedalmond;
    background: url("") no-repeat center center;
    background-size: cover;

.wishlist {
    width: 300px;
    border: 10px dotted blanchedalmond;
    box-shadow: 5px 5px 5px rgba(0,0,0,0.2);

.wishlist-item {
    color: white;
    text-align: center;
    text-shadow: 1px 1px 1px black;
    font-weight: bolder;
    font-size: 22px;
    list-style-type: square;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;

.wishlist-item:nth-child(odd) {
    background-color: red

.wishlist-item:nth-child(even) {
    background-color: green;

Day 8: Animated Progress Bar


  • Build a CSS animation of a progress bar filling to 100%. The animation should run continuously, with a small pause when the bar is filled 100%.
  • The progress begins red, turns blue, at 50%, and green when complete.
  • CSS only!


๐Ÿ”— My solution for day 8

This code creates an animated progress bar that changes color from red to blue to green as it fills up with a candy cane background!

The :root section defines color variables for the progress bar. The body section styles the webpage, including setting a Christmas-themed background image and aligning content in the center.

The h1 section styles the title with a large font size, white color, and a shadow effect. The .container section styles the container of the progress bar.

The .progress-bar section styles the progress bar itself, giving it a width, height, and a striped background. The .progress-status section is where the animation is applied to create a filling effect.

The @keyframes progress section defines the animation, dictating that the progress bar should start at a width of 0% (empty), then increase to a width of 50% (half full), and finally reach a width of 100% (fully filled). The bar's color changes at each stage, going from red to blue to green.

:root {
    --progressbar-bg: lightgrey;
    --start: red;
    --middle: blue;
    --finish: green;

body {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-image: url("");
    background-size: cover;
    background-position: center;
    font-family: 'Mountains of Christmas'; 

h1 {
    font-size: 50px;
    color: white;
    text-shadow: 2px 2px 2px black, -2px -2px 2px red;

.container {
    border: 5px solid black;
    border-radius: 25px;
    box-shadow: 3px 3px 3px rgba(0,0,0,0.5);
    width: 300px;
    margin: 50px auto;

.progress-bar {
    width: 100%;
    height: 30px;
    background: repeating-linear-gradient(
        white 10px,
        red 10px,
        red 20px
    border-radius: 15px;
    overflow: hidden;

.progress-status {
    height: 100%;
    width: 0;
    background: var(--start);
    animation: progress 3s infinite;

@keyframes progress {
    0% {
        width: 0;
        background: var(--start);
    50% {
        width: 50%;
        background: var(--middle);
    100% {
        width: 100%;
        background: var(--finish);

Day 9: AI Christmas E-card Generator


  • Use AI to generate an image for a Christmas e-card
  • Render the image to the DOM


๐Ÿ”— My solution for day 9

I thought it would be entertaining to modify the provided code, transforming it into a Star Wars-themed card! I used the Hugging Face API, and I utilized Scrimba's method of storing environment variables.

My prompt:
"Create a festive image that captures the spirit of the Star Wars universe's "Hope Day". The scene should be set on the lush, forested home planet of Chewbacca, Kashyyyk. Specifically, it should depict Chewbacca and his family, including his wife Malla, his son Lumpy, and his father Itchy, celebrating Hope Day together. They should be on a balcony of their towering treehouse, as seen in the Star Wars Christmas Special and the movie Revenge of the Sith. The family should be joyously engaged in typical holiday activities, such as exchanging gifts or sharing a meal. The background should feature the dense, towering Wroshyr trees of Kashyyyk, bathed in the warm, golden light of sunset. To add a festive touch, the treehouse and surrounding trees could be decorated with glowing lanterns or strands of lights. The card should embody the warmth, joy, and hope that characterizes both the holiday season and the spirit of Star Wars' "Hope Day"."

This script utilizes the Hugging Face Inference API to generate an image based on user input.

First, it imports the HfInference class from the @huggingface/inference package. This class provides methods to interact with the Hugging Face Inference API.

Then, it gets references to several HTML elements: a dialog modal, an image container, an input form, and a user input field.

The generateImage function is an asynchronous function that creates an instance of HfInference with a provided API key. It then calls the textToImage method on this instance, passing in an object that specifies the model to use, the inputs to provide to the model, and any additional parameters. This method returns a Blob representing the generated image. The function then converts this Blob to a data URL and returns it.

blobToDataURL is a helper function that converts a Blob to a data URL. It creates a new FileReader, sets up event listeners to resolve or reject the Promise when the read operation is complete, and starts reading the Blob as a data URL.

The event listener for the 'submit' event on the input form prevents the default form submission behavior, closes the dialog modal, and sets the inner HTML of the image container to a loading spinner. It then calls generateImage, waits for it to complete, and sets the src attribute of an img element in the image container to the returned data URL. Finally, it clears the user input field.

The show method is called on the dialog modal to display it when the script runs.

import { HfInference } from '@huggingface/inference'

const dialogModal = document.getElementById('dialog-modal')
const imageContainer = document.getElementById('image-container')
const inputForm = document.getElementById('input-form');
const userInput = document.getElementById('user-input');

async function generateImage() {
    const inference = new HfInference(process.env.HUGGING_FACE_API_KEY);
    const blob = await inference.textToImage({
        model: "stabilityai/stable-diffusion-2",
        inputs: userInput.value,
        parameters: {
            negative_prompt: "blurry",

    return await blobToDataURL(blob);

function blobToDataURL(blob) {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onloadend = () => resolve(reader.result);
        reader.onerror = reject;

inputForm.addEventListener('submit', async (e) => {
    imageContainer.innerHTML = '<div class="spinner"></div>';
    imageContainer.innerHTML = `<img src="${await generateImage()}" alt="${userInput.value}">`; 
    userInput.value = '';

Day 10: Rockin' Around


Add code inside of the playSong(id) function to make the YouTube Player play the YouTube song.


๐Ÿ”— My solution for day 10

I'd like to take a moment to explain why it's beneficial for developers to create a blog. This solved this exact JavaScriptmas challenge last year, and to solve it this year, I read the solution I wrote in my JavaScriptmas 2022 article!

In this challenge, all of the heavy lifting is already completed. All that's needed to solve it is to write a playSong function that returns the YouTube ID for the chosen song. This is accomplished by using string concatenation which updates the value of the player.src.

Initially, the player's source is set to "", which plays the version of White Christmas as seen in the holiday classic, Home Alone. The YouTube ID for this song is PoAjmmD89Vw, which is part of the provided URL.

So, the challenge is solved by updating the player.src value using the passed-in ID value of the song that is chosen by the user when they click on the corresponding buttons.

const player = document.getElementById("player")

function playSong(id) {
  // Challenge: Add code here to make the youtube player play the new YouTube song
  player.src = `${id}?autoplay=1`

If you would like to learn more about my journey with Scrimba and how learning with them may help you, you can read my article: How Scrimba is helping me and many others to become confident, well-prepared web developers

Scrimba has once again impressed and inspired me! You can read my full Scrimba review on my 12/13/2020 post.

Per Harald Borgen Quote

"That's one of the best Scrimba reviews I've ever read, @MikeJudeLarocca. Thank you! ๐Ÿ™ "

โ€” Per Harald Borgen, CEO of Scrimba December 14, 2020

10% Scrimba Discount!

If you're interested in taking a paid course from Scrimba, be sure to use the discount code provided:

Valid for an additional 10% off semester and annual plans. Expires on July 31st, 2024


Scrimba's annual JavaScriptmas event is a fun, festive way to commit to coding daily. Whether you are a new coder or a seasoned one, you have an opportunity to share your work with the community, make new friends, and even get a chance to win prizes!

If you're interested in continuing learning with Scrimba after the FREE event, be sure to check out their many FREE courses! If you are ready to commit to becoming a hireable front-end web developer, be on the lookout for discounted course rates!

Don't miss out on this exciting coding event! Participate in Scrimba's JavaScriptmas today, share your solutions, connect with fellow developers, and improve your skills while having fun! Merry JavaScriptmas! ๐ŸŽ„

Let's connect! I'm active on LinkedIn and Twitter.

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