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Cat and Mouse

This is a project that Simon started a few weeks ago but never finished, so I think it’s time I archive it here. It’s based upon this wonderful Numberphile video, in which Ben Sparks shows a curious math problem – a game of cat and mouse – in a computer simulation he’d built. The setting is that the mouse is swimming in a round pond and is trying to escape from a cat that is running around the pond. What is the strategy that the mouse should apply to escape, considering that it swims at a quarter of the speed the cat runs?

Simon came up with his own code to recreate the simulation from the Numberphile video. In the four fragments I recorded, he showcases what he has built. Please ignore my silly questions, at the time of the recording I hadn’t viewed the Numberphile video yet and had no idea what the problem entailed.

Coding, Community Projects, Computer Science, Contributing, JavaScript, Milestones, Notes on everyday life, Simon teaching, Simon's Own Code

Simon’s new “giant project”: Sorting Visualizations

this video sums up more than one week of hard work

Simon writes: I’ve built a giant project; a website / community project / platform for making algorithms! I’ve built in this video Bubble Sort, Selection Sort, Insertion Sort, Mergesort, Quicksort, Heapsort, Shell Sort and Radix Sort. So I’m done with the sorting part of the project. In the next video I’ll show you the making of the Pathfinding part of the project, and then, I’m going to put it on GitHub, and pass it on to the community, to put more algorithms on there, and even new types of algorithms!

Play with Simon’s visualizations on at:

Simon’s tweet about the project

Simon has already recorded a series of video tutorials about sorting algorithms earlier this spring. In the videos, he codes on his RaspberryPi, but here are the links to the Python code available on his GitHub page: Parts 1 – 5; Parts 6 – 7.

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Simon’s Community Contribution: Variation of 2D Casting Coding Challenge in p5.js

This is Simon’s version of Daniel Shiffman’s 2D Casting code, made on Wednesday last week right after the live session. Link to the live session including the coding challenge.

Code and interactive animation are online at:
Play with the animation online at:

Simon’s suggestions during a patron-only live session yesterday
a screenshot of Simon’s community contribution published on the Coding Train website

Simon has also made one more, optimized version of this project (with fewer rays, runs faster):

Both of Simon’s versions have been added to the community contributions on the Coding Train website:

screenshot of the optimized version
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Building a 2048 Game. Part 3.

Simon’s general plan for his 2048 project:

Link to the project in progress on GitHub:

In this third part he shows how he changed the fonts, how that messed up the code, how he solved that problem and also how he created a function to move any tile anywhere else on the grid. Simon doesn’t yet have the function to move a tile to the right place – he’ll cover that in game mechanics in Part 4.

Link to Parts 1 and 2.

Biology, Coding, Java, JavaScript, Milestones, Simon makes gamez, Simon's Own Code

Simon has created an “immortal” organism?

The organism is the green triangle on the left

Simon opened up a genetic algorithm game he built about two years ago and made a fascinating discovery: one of the organisms seems to have become immortal! Simon has called his discovery “The Everlasting Vehicle” and saved the vehicle’s DNA.

Links to the game on GiHub:
Original code:
p5.js version:

Simon writes:
The last time I ran the program is a couple of hours ago. Everything died out, except for one vehicle.

I have programmed this with a genetic algorithm. They have a DNA with 4 genes.

Attraction/Repulsion to food
Attraction/Repulsion to poison
How far it can see food
How far it can see poison
They also have a health, which goes down over time. If they eat food, then their health goes up, if they eat poison, then their health suddenly goes down. A good health is 1, and a bad one is 0.

So what was The Everlasting Vehicle’s DNA and health?

Property Value
Attraction/Repulsion to food 1.9958444373034823
Attraction/Repulsion to poison 1.3554737395594456
How far it can see food 53.31017416626768
How far it can see poison 23.33902221893798
Average health ~397
So it attracts to poison, yet its health is approximately 397 times bigger than a very good health! And better yet, it even lasted for a couple of hours so far!!!

Inspired by Daniel Shiffman’s Evolutionary Steering Behaviors Coding Challenge
Link to the Challenge:

Coding, JavaScript, Simon makes gamez, Simon's Own Code

Simon’s own 2048

Link to the project in progress on GitHub:

Simon has started building his own 2048 game. In the two videos below he explains the initial stages of the project and how he has created the tiles. At the moment, he plans to build a classic 2048 first and create a few desktop versions of more exotic variations of 2048 later.

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Simon took part in a Coding Train livestream in Paris!

Simon and Daniel Shiffman after the livestream

The video below is part of Daniel Shiffman’s livestream hosted by GROW Le Tank in Paris on 6 January 2019 about KNN, machine learning, transfer learning and image recognition. Daniel kindly allowed Simon to take the stage for a few minutes to make a point about image compression (the algorithm that Daniel used was sort of a compression algorithm):

Here is a different recording (in two parts) of the same moment from a different angle: