Day 21 of 21 Days of Javascript

Michael Tefula

29 Aug 2025 — 1 min read

Today marks the end of my 21 Day challenge to get the basics of Javascript. The capstone project was to build a to-do list app, which I completed today.

ToDo App

Because I was focussed on learning Javascript, I used ChatGPT to write the boilerplate HTML and CSS. I tried as much as possible to rely on my own knowledge of Javascript. To that end I wrote most of the JS code manually. However, there were elements where I needed to connect the Javascript code to the HTML document. In this scenario, I relied on the Javascript documentation here, and occasionally ChatGPT, to look up specific standard methods (e.g. how to set up event listeners to run code after a button is pressed.)

Here's a preview of the app. To the left is the user interface. To right is the javascript browser console, which shows the array of ToDo objects being stored.

Was the 21 Day Challenge a Success?

I'm still not as fluent in Javascript as I am in Python, but I know enough to solve simple algorithmic challenges. I also have enough fluency to read and understand the main components of Javascript code. This, to me, is success.

What comes next? As a learning adventure, I'll continue learning Javascript for the rest of the year and parts of 2026. I will also come back to Python at some point to upgrade my knowledge of it. I really do find it enjoyable as a fundamental programming language for everyday work and automation.

Day 20 of 21 Days of Javascript

I spent some time today trying to understand in more detail how Javascript works with web pages. I'm doing this through a mini project: a barebones to-do list app. Since I'm focussed on Javascript, I've asked ChatGPT to provide the style sheet to make

Day 19 of 21 Days of Javascript

A review and next steps... Today I completed Part I: Language from the Eloquent Javascript book. I skimmed the final two chapters, which felt less practical for me at this stage of the learning journey. The penultimate chapter covers async programming (something I'll pick up later, as its

Day 18 of 21 Days of Javascript

Oh the quirks of JS! I continue to be reminded of why I much prefer Python. Javascript, it turns out, is far more forgiving when it comes to making mistakes with the language (this is why Typescript exists.) For example let's consider working with strings and numbers. Python

Day 17 of 21 Days of Javascript

I completed chapter 7 and it has to be the most confusing chapter of Eloquent Javascript so far. It jumps across concepts relatively quickly, assuming a firmer grasp than beginners might have. For example, I couldn't complete the bonus exercise on data structures, right after the robot sim.