explaingit

aj-michael/tetris

Analysis updated 2026-07-14 · repo last pushed 2015-04-08

JavaScriptAudience · developerComplexity · 2/5DormantSetup · moderate

TLDR

A simple Tetris game you can play in your browser, built in Elm to demonstrate how functional programming handles game state without unexpected behavior.

Mindmap

mindmap
  root((repo))
    What it does
      Falling Tetris pieces
      Rotate and shift blocks
      Clear completed lines
    Tech stack
      Elm language
      Compiles to JavaScript
      Runs in browser
    Use cases
      Play Tetris in browser
      Learn Elm game design
      Study functional code
    Audience
      Elm hobbyists
      Functional programming learners
    Project type
      Personal learning project
      Small readable codebase
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Code map

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filefunction / class

What do people build with it?

USE CASE 1

Play a round of Tetris directly in your browser to see Elm in action.

USE CASE 2

Study the source code to learn how game loops and board state work in a functional language.

USE CASE 3

Use the codebase as a starting point to experiment with Elm for your own browser games.

What is it built with?

ElmJavaScript

How does it compare?

aj-michael/tetrisalce/yogajsalexlabs-ai/brain-concierge
Stars0
LanguageJavaScriptJavaScriptJavaScript
Last pushed2015-04-082017-11-07
MaintenanceDormantDormant
Setup difficultymoderatehardmoderate
Complexity2/51/53/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

You'll need familiarity with Elm's build process and command-line tools to compile and run the game locally.

No license information is included in this repository, so usage rights are unclear.

In plain English

This repository is a working version of Tetris, the classic block-stacking puzzle game, built as a personal project. You can play it in your browser just like you'd expect, falling pieces, rotating shapes, clearing lines. What makes it technically interesting is that it's written in Elm, a programming language that compiles to JavaScript. The README doesn't go into detail about features or controls, but the core gameplay loop of Tetris is here: pieces drop from the top of a grid, you shift and rotate them, and completed rows disappear to make room for more. Elm is known for enforcing a strict architecture where the game state updates predictably, which tends to produce games that rarely crash or behave unexpectedly. The audience is likely other hobbyists curious about Elm or people who want a small, readable codebase to learn from. Since it's a "simple implementation" by the author's own description, it's not aiming to be a polished commercial product, it's a learning exercise or demo. Someone exploring functional programming might study the source to see how a game loop and board state can be modeled without side effects. Beyond the single line in the README, there's no documentation about installation, controls, or planned features. If you're comfortable with basic command-line tools, the project can likely be run locally, but you'd need some familiarity with Elm's build process. It's a straightforward project that does one thing: shows Tetris working in a less common language.

Copy-paste prompts

Prompt 1
I found a Tetris game written in Elm. Help me set up the Elm build tools so I can compile and run this Tetris project locally in my browser.
Prompt 2
Walk me through how this Elm Tetris codebase models the game state, specifically how the falling piece, board grid, and line-clearing logic are handled without side effects.
Prompt 3
I want to modify this Elm Tetris project to add a score counter. Show me how Elm's architecture would handle updating a score value when a line is cleared.
Prompt 4
Explain how to add basic keyboard controls to this Elm Tetris game so players can move pieces left and right using arrow keys.

Frequently asked questions

What is tetris?

A simple Tetris game you can play in your browser, built in Elm to demonstrate how functional programming handles game state without unexpected behavior.

What language is tetris written in?

Mainly JavaScript. The stack also includes Elm, JavaScript.

Is tetris actively maintained?

Dormant — no commits in 2+ years (last push 2015-04-08).

What license does tetris use?

No license information is included in this repository, so usage rights are unclear.

How hard is tetris to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is tetris for?

Mainly developer.

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