Michael Jude Larocca

Scrimba: JavaScriptmas 2020

Published on December 20, 2020

What is JavaScriptmas? JavaScriptmas is a twenty-four-day coding course created by Scrimba.

Scrimba JavaScirptmas

The JavaScriptmas course is a brilliant idea. I'll explain why I believe so with a few questions and answers.

Question: Would you like to take part in a twenty-four-day coding challenge that progressively gets more difficult, which will help you become a better web developer?

Answer: No.

Question: Would you like to participate in a festive twenty-four-day event, where you can sit down and code with your favorite holiday drink, which will help you become a better web developer?

Answer: Maybe.

Question: Did we mention a daily raffle, where participants could win a one-year membership, and a grand prize winner awarded with a $1,000 and lifetime membership to Scrimba?

Answer: YES!!! I want to participate!

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! 🙏 "

— Per Harald Borgen, CEO of Scrimba December 14, 2020

The Rolling Dice

My favorite challenge

Day 8, The Rolling Dice

My favorite challenge was The Rolling Dice. In this challenge, we needed to create a working rolling die.

To pass the challenge, we had to program the die to roll every time a user clicked it. When the program runs, a written message displays the rolled number, and the die reflects the new number.

As a bonus challenge, they instructed us to improve the overall style. I was delighted to see that Leanne from Scrimba complimented my styling!

Leanne Comment - Nice Styling

I enjoyed this challenge because I created something that I can incorporate into a JavaScript game!

Day 13

My hardest challenge

Day 13, (Extract Each Kth)

I was on a winning streak until I hit "Lucky 13". It was a challenge that I was trying to solve by comparing two arrays.

The first array was already provided and had the numbers 1 through 10. The second array I created, with a formula, contained numbers 3, 6, and 9.

	const numberDivide = index /  nums.length * 10;

    for(let i = 0; i < numberDivide; i++) {
        arrayCompare.push(total + numberDivide);
        total += numberDivide;
    // arrayCompare now equals [3,6,9]

To solve the challenge, we had to return an array containing the numbers from the first provided array that excluded specific numbers; in this case, numbers 3, 6, and 9. The result needed to be:

	arrayAnswer = [1,2,4,5,7,8,10]

Over and over again! W.T.F.? Which in this case represents, "Which, This Function?" I keep trying various functions to solve the problem.

Eventually, I solved the challenge using the method includes().

	let checkForNumbers = arrayCompare.includes(nums[i]);

I looped through the length of the first array. I compared each item in the first array to all of the second array items during the loop. If the includes method returned false, I pushed the item from the first array into the answer array.

    for(let i = 0; i < nums.length; i++) {

        let checkForNumbers = arrayCompare.includes(nums[i]);

        if(checkForNumbers === false) {

I passed the challenge by returning the answer array.

	 return arrayAnswer;

What I learned

At first, I was disappointed that I was struggling so much with some of the JavaScriptmas challenges. Then I realized that this was a good thing because these challenges showed me the areas of study that I need to improve on.

What I enjoyed

I enjoyed sharing code solutions with my gold medal-winning study group, "The Booleans!"

The Booleans - gold medal

Throughout the JavaScriptmas course, our study group shared their coding solutions on Scrimba's Discord channel. We explained how our code worked and why we decided to write the program the way we did.

Sharing and discussing our code made the course an even more educational experience.

We learned together that there are many ways to write a program to solve the same problem. It truly is incredible!

My JavaScriptmas Submissions

Below is my list of each day's completed JavaScriptmas challenges.

I hope that "Scrimba Claus" checks it twice!

Scrimba Claus

Pixabay: Illustration by Mohamed Hassan
Date Scrim
12/01/2020 Candies
12/02/2020 Deposit Profit
12/03/2020 Chunky Monkey
12/04/2020 Century From Year
12/05/2020 Reverse a String
12/06/2020 Sort By Length
12/07/2020 Count Vowel Consonant
12/08/2020 The Rolling Dice
12/09/2020 Sum Odd Fibonacci Numbers
12/10/2020 Adjacent Elements Product
12/11/2020 Avoid Obstacles
12/12/2020 Valid Time
12/13/2020 Extract Each Kth
12/14/2020 Maximal Adjacent Difference
12/15/2020 Carousel
12/16/2020 Insert Dashes
12/17/2020 Different Symbols Naive
12/18/2020 Array Previous Left
12/19/2020 Alphabet Subsequence
12/20/2020 Domain Type
12/21/2020 Sum of 2
12/22/2020 Extract Matrix Column
12/23/2020 Social Media Input
12/24/2020 Test your Agility - (Coded along with the JavaScriptmas live stream!)

Certificate - JavaScriptmas

Scrimba's Javascriptmas Course

Dylan Claus

Special Event!

Scrimba teacher Dylan Israel's latest course is a festive one, and there is still time to get in on the fun!

Check out his latest course, "24 days of JavaScriptmas," available now on Scrimba.

See the details below:

24 days of #JavaScriptmas Level up your JavaScript skills with a daily coding challenge from December 1st to 24th, 2020. Every day, we'll pick a winner who gets Scrimba Pro for a year (worth $150). In addition to the daily prize, we'll hand out a Grand Prize of $1000 along with a lifetime Pro membership on Scrimba on Christmas Eve!

Key Points

  • Scrimba has once again impressed and inspired me
  • I enjoyed The Rolling Dice project because I can incorporate it into a JavaScript game
  • The complex challenges showed me the areas of study that I need to improve on.
  • Sharing and discussing our code in the study group made the course an even more educational experience.


I enjoyed taking part in Scrimba's JavaScriptmas course. It was a fun, festive, and educational activity. It also proved to be an excellent study group experience.

Will I take part in JavaScriptmas again next year? My answer is: YES!!! I want to participate!

I wish you all a "Merry JavaScriptmas!"

Please share it!