This repository is a compilation of well-written, step-by-step guides for re-creating our favorite technologies from scratch.
What I cannot create, I do not understand — Richard Feynman.
It's a great way to learn.
- 3D Renderer
- Augmented Reality
- BitTorrent Client
- Blockchain / Cryptocurrency
- Bot
- Command-Line Tool
- Database
- Docker
- Emulator / Virtual Machine
- Front-end Framework / Library
- Game
- Git
- Network Stack
- Neural Network
- Operating System
- Physics Engine
- Programming Language
- Regex Engine
- Search Engine
- Shell
- Template Engine
- Text Editor
- Visual Recognition System
- Voxel Engine
- Web Browser
- Web Server
- Uncategorized
- 🌎 C++: Introduction to Ray Tracing: a Simple Method for Creating 3D Images
?⭐?🍴C++: How OpenGL works: software rendering in 500 lines of code)- C++: Raycasting engine of Wolfenstein 3D
- C++: Physically Based Rendering:From Theory To Implementation
- 🌎 C++: Ray Tracing in One Weekend
- 🌎 C++: Rasterization: a Practical Implementation
- 🌎 C# / TypeScript / JavaScript: Learning how to write a 3D soft engine from scratch in C#, TypeScript or JavaScript
- 🌎 Java / JavaScript: Build your own 3D renderer
- Java: How to create your own simple 3D render engine in pure Java
- JavaScript / Pseudocode: Computer Graphics from scratch
- Python: A 3D Modeller
- 🌎 C#: How To: Augmented Reality App Tutorial for Beginners with Vuforia and Unity 3D [video]
- 🌎 C#: How To Unity ARCore [video]
- 🌎 C#: AR Portal Tutorial with Unity [video]
- 🌎 C#: How to create a Dragon in Augmented Reality in Unity ARCore [video]
- 🌎 C#: How to Augmented Reality AR Tutorial: ARKit Portal to the Upside Down [video]
- 🌎 Python: Augmented Reality with Python and OpenCV
- 🌎 C#: Building a BitTorrent client from scratch in C#
- 🌎 Go: Building a BitTorrent client from the ground up in Go
- 🌎 Nim: Writing a Bencode Parser
- 🌎 Node.js: Write your own bittorrent client
- Python: A BitTorrent client in Python 3.5
- 🌎 ATS: Functional Blockchain
- 🌎 C#: Programming The Blockchain in C#
- 🌎 Crystal: Write your own blockchain and PoW algorithm using Crystal
- 🌎 Go: Building Blockchain in Go
- 🌎 Go: Code your own blockchain in less than 200 lines of Go
- 🌎 Java: Creating Your First Blockchain with Java
1235⭐330🍴JavaScript: A cryptocurrency implementation in less than 1500 lines of code)1032⭐200🍴JavaScript: Build your own Blockchain in JavaScript)- 🌎 JavaScript: Learn & Build a JavaScript Blockchain
1741⭐751🍴JavaScript: Creating a blockchain with JavaScript)- 🌎 JavaScript: How To Launch Your Own Production-Ready Cryptocurrency
- 🌎 JavaScript: Writing a Blockchain in Node.js
- 🌎 Kotlin: Let’s implement a cryptocurrency in Kotlin
- 🌎 Python: Learn Blockchains by Building One
- Python: Build your own blockchain: a Python tutorial
- Python: A Practical Introduction to Blockchain with Python
- 🌎 Python: Let’s Build the Tiniest Blockchain
666⭐73🍴Ruby: Programming Blockchains Step-by-Step (Manuscripts Book Edition))- 🌎 Scala: How to build a simple actor-based blockchain
- 🌎 TypeScript: Naivecoin: a tutorial for building a cryptocurrency
- 🌎 TypeScript: NaivecoinStake: a tutorial for building a cryptocurrency with the Proof of Stake consensus
- 🌎 Rust: Building A Blockchain in Rust & Substrate
- 🌎 Haskell: Roll your own IRC bot
- 🌎 Node.js: Creating a Simple Facebook Messenger AI Bot with API.ai in Node.js
- 🌎 Node.js: How to make a responsive telegram bot
- 🌎 Node.js: Create a Discord bot
- 🌎 Node.js: gifbot - Building a GitHub App
- 🌎 Node.js: Building A Simple AI Chatbot With Web Speech API And Node.js
- 🌎 Python: How to Build Your First Slack Bot with Python
- 🌎 Python: How to build a Slack Bot with Python using Slack Events API & Django under 20 minute
- Python: Build a Reddit Bot
- 🌎 Python: How To Make A Reddit Bot [video]
- 🌎 Python: How To Create a Telegram Bot Using Python
- 🌎 Python: Create a Twitter Bot in Python Using Tweepy
- 🌎 Python: Creating Reddit Bot with Python & PRAW [video]
- 🌎 R: Build A Cryptocurrency Trading Bot with R
- 🌎 Rust: A bot for Starcraft in Rust, C or any other language
- 🌎 Go: Visualize your local git contributions with Go
- 🌎 Go: Build a command line app with Go: lolcat
- 🌎 Go: Building a cli command with Go: cowsay
- 🌎 Go: Go CLI tutorial: fortune clone
- 🌎 Nim: Writing a stow alternative to manage dotfiles
- 🌎 Node.js: Create a CLI tool in Javascript
- 🌎 Rust: Command line apps in Rust
- 🌎 Rust: Writing a Command Line Tool in Rust
- 🌎 C: Let's Build a Simple Database
- 🌎 C++: Build Your Own Redis from Scratch
- 🌎 C#: Build Your Own Database
- Clojure: An Archaeology-Inspired Database
- 🌎 Crystal: Why you should build your own NoSQL Database
- 🌎 Go: Build Your Own Database from Scratch: Persistence, Indexing, Concurrency
- 🌎 Go: Build Your Own Redis from Scratch
- JavaScript: Dagoba: an in-memory graph database
- Python: DBDB: Dog Bed Database
- Python: Write your own miniature Redis with Python
- 🌎 Ruby: Build your own fast, persistent KV store in Ruby
- 🌎 Rust: Build your own Redis client and server
- 🌎 C: Linux containers in 500 lines of code
- 🌎 Go: Build Your Own Container Using Less than 100 Lines of Go
- 🌎 Go: Building a container from scratch in Go [video]
2996⭐238🍴Python: A workshop on Linux containers: Rebuild Docker from Scratch)860⭐61🍴Python: A proof-of-concept imitation of Docker, written in 100% Python)11958⭐740🍴Shell: Docker implemented in around 100 lines of bash)
- 🌎 C: Home-grown bytecode interpreters
- C: Virtual machine in C
- 🌎 C: Write your Own Virtual Machine
- 🌎 C: Writing a Game Boy emulator, Cinoop
- C++: How to write an emulator (CHIP-8 interpreter)
- C++: Emulation tutorial (CHIP-8 interpreter)
- C++: Emulation tutorial (GameBoy emulator)
- C++: Emulation tutorial (Master System emulator)
- 🌎 C++: NES Emulator From Scratch [video]
- Common Lisp: CHIP-8 in Common Lisp
- JavaScript: GameBoy Emulation in JavaScript
- Python: Emulation Basics: Write your own Chip 8 Emulator/Interpreter
- 🌎 Rust: 0dmg: Learning Rust by building a partial Game Boy emulator
- 🌎 JavaScript: WTF is JSX (Let's Build a JSX Renderer)
6350⭐532🍴JavaScript: A DIY guide to build your own React)- 🌎 JavaScript: Building React From Scratch [video]
- 🌎 JavaScript: Gooact: React in 160 lines of JavaScript
- 🌎 JavaScript: Learn how React Reconciler package works by building your own lightweight React DOM
- 🌎 JavaScript: Build Yourself a Redux
- 🌎 JavaScript: Let’s Write Redux!
- 🌎 JavaScript: Redux: Implementing Store from Scratch [video]
- 🌎 JavaScript: Build Your own Simplified AngularJS in 200 Lines of JavaScript
- JavaScript: Make Your Own AngularJS
- 🌎 JavaScript: How to write your own Virtual DOM
- 🌎 JavaScript: Building a frontend framework, from scratch, with components (templating, state, VDOM)
- 🌎 JavaScript: Build your own React
- 🌎 JavaScript: Building a Custom React Renderer [video]
- 🌎 C: Handmade Hero
- 🌎 C: How to Program an NES game in C
- 🌎 C: Chess Engine In C [video]
- 🌎 C: Let's Make: Dangerous Dave [video]
- 🌎 C: Learn Video Game Programming in C [video]
- 🌎 C: Coding A Sudoku Solver in C [video]
- 🌎 C: Coding a Rogue/Nethack RPG in C [video]
- 🌎 C: On Tetris and Reimplementation
- 🌎 C++: Breakout
- C++: Beginning Game Programming v2.0
- C++: Tetris tutorial in C++ platform independent focused in game logic for beginners
- 🌎 C++: Remaking Cavestory in C++ [video]
- 🌎 C++: Reconstructing Cave Story [video]
- C++: Space Invaders from Scratch
- C#: Learn C# by Building a Simple RPG
- 🌎 C#: Creating a Roguelike Game in C#
- 🌎 C#: Build a C#/WPF RPG
- 🌎 Go: Games With Go [video]
- 🌎 Java: Code a 2D Game Engine using Java - Full Course for Beginners [video]
- 🌎 Java: 3D Game Development with LWJGL 3
- 🌎 JavaScript: 2D breakout game using Phaser
- JavaScript: How to Make Flappy Bird in HTML5 With Phaser
- 🌎 JavaScript: Developing Games with React, Redux, and SVG
- 🌎 JavaScript: Build your own 8-Ball Pool game from scratch [video]
- 🌎 JavaScript: How to Make Your First Roguelike
- 🌎 JavaScript: Think like a programmer: How to build Snake using only JavaScript, HTML & CSS
?⭐?🍴Lua: BYTEPATH)- 🌎 Python: Developing Games With PyGame
- 🌎 Python: Making Games with Python & Pygame [pdf]
- Python: Roguelike Tutorial Revised
- 🌎 Ruby: Developing Games With Ruby
- 🌎 Ruby: Ruby Snake
- 🌎 Rust: Adventures in Rust: A Basic 2D Game
- 🌎 Rust: Roguelike Tutorial in Rust + tcod
- Haskell: Reimplementing “git clone” in Haskell from the bottom up
- JavaScript: Gitlet
- 🌎 JavaScript: Build GIT - Learn GIT
- 🌎 Python: Just enough of a Git client to create a repo, commit, and push itself to GitHub
- 🌎 Python: Write yourself a Git!
- 🌎 Python: ugit: Learn Git Internals by Building Git Yourself
- 🌎 Ruby: Rebuilding Git in Ruby
- C: Beej's Guide to Network Programming
- C: Let's code a TCP/IP stack
299⭐18🍴C / Python: Build your own VPN/Virtual Switch)- 🌎 Ruby: How to build a network stack in Ruby
- 🌎 C#: Neural Network OCR
- 🌎 F#: Building Neural Networks in F#
- 🌎 Go: Build a multilayer perceptron with Golang
- 🌎 Go: How to build a simple artificial neural network with Go
- 🌎 Go: Building a Neural Net from Scratch in Go
- 🌎 JavaScript / Java: Neural Networks - The Nature of Code [video]
- 🌎 JavaScript: Neural networks from scratch for JavaScript linguists (Part1 — The Perceptron)
- 🌎 Python: A Neural Network in 11 lines of Python
- 🌎 Python: Implement a Neural Network from Scratch
- Python: Optical Character Recognition (OCR)
- 🌎 Python: Traffic signs classification with a convolutional network
- 🌎 Python: Generate Music using LSTM Neural Network in Keras
- 🌎 Python: An Introduction to Convolutional Neural Networks
- 🌎 Python: Neural Networks: Zero to Hero
- Assembly: Writing a Tiny x86 Bootloader
- Assembly: Baking Pi – Operating Systems Development
- 🌎 C: Building a software and hardware stack for a simple computer from scratch [video]
- 🌎 C: Operating Systems: From 0 to 1
- 🌎 C: The little book about OS development
- C: Roll your own toy UNIX-clone OS
- 🌎 C: Kernel 101 – Let’s write a Kernel
- 🌎 C: Kernel 201 – Let’s write a Kernel with keyboard and screen support
1074⭐244🍴C: Build a minimal multi-tasking kernel for ARM from scratch)27579⭐3331🍴C: How to create an OS from scratch)- 🌎 C: Malloc tutorial
- 🌎 C: Hack the virtual memory
13287⭐1296🍴C: Learning operating system development using Linux kernel and Raspberry Pi)- 🌎 C: Operating systems development for Dummies
- 🌎 C++: Write your own Operating System [video]
- C++: Writing a Bootloader
- 🌎 Rust: Writing an OS in Rust
- 🌎 Rust: Add RISC-V Rust Operating System Tutorial
- 🌎 (any): Linux from scratch
- 🌎 C: Video Game Physics Tutorial
- C++: Game physics series by Allen Chou
- 🌎 C++: How to Create a Custom Physics Engine
- 🌎 C++: 3D Physics Engine Tutorial [video]
- JavaScript: How Physics Engines Work
- JavaScript: Broad Phase Collision Detection Using Spatial Partitioning
- 🌎 JavaScript: Build a simple 2D physics engine for JavaScript games
10127⭐2569🍴(any): mal - Make a Lisp)1019⭐142🍴Assembly: Jonesforth)- C: Baby's First Garbage Collector
- C: Build Your Own Lisp: Learn C and build your own programming language in 1000 lines of code
- C: Writing a Simple Garbage Collector in C
4074⭐747🍴C: C interpreter that interprets itself.)489⭐72🍴C: A C & x86 version of the "Let's Build a Compiler" by Jack Crenshaw)10662⭐1028🍴C: A journey explaining how to build a compiler from scratch)- 🌎 C++: Writing Your Own Toy Compiler Using Flex
- 🌎 C++: How to Create a Compiler [video]
- 🌎 C++: Kaleidoscope: Implementing a Language with LLVM
- 🌎 F#: Understanding Parser Combinators
- 🌎 Elixir: Demystifying compilers by writing your own [video]
591⭐46🍴Go: The Super Tiny Compiler)- 🌎 Go: Lexical Scanning in Go [video]
- 🌎 Haskell: Let's Build a Compiler
- Haskell: Write You a Haskell
- 🌎 Haskell: Write Yourself a Scheme in 48 Hours
- 🌎 Haskell: Write You A Scheme
- Java: Crafting interpreters: A handbook for making programming languages
- Java: Creating JVM Language
28009⭐2866🍴JavaScript: The Super Tiny Compiler)172⭐14🍴JavaScript: The Super Tiny Interpreter)- 🌎 JavaScript: Little Lisp interpreter
- JavaScript: How to implement a programming language in JavaScript
- 🌎 JavaScript: Let’s go write a Lisp
- 🌎 OCaml: Writing a C Compiler
- 🌎 OCaml: Writing a Lisp, the series
- 🌎 Pascal: Let's Build a Compiler
- Python: A Python Interpreter Written in Python
- Python: lisp.py: Make your own Lisp interpreter
- Python: How to Write a Lisp Interpreter in Python
- 🌎 Python: Let’s Build A Simple Interpreter
- 🌎 Python: Make Your Own Simple Interpreted Programming Language [video]
- 🌎 Python: From Source Code To Machine Code: Build Your Own Compiler From Scratch
- 🌎 Racket: Beautiful Racket: How to make your own programming languages with Racket
- 🌎 Ruby: A Compiler From Scratch
- 🌎 Ruby: Markdown compiler from scratch in Ruby
- 🌎 Rust: So You Want to Build a Language VM
- 🌎 Rust: Learning Parser Combinators With Rust
- 🌎 Swift: Building a LISP from scratch with Swift
- 🌎 TypeScript: Build your own WebAssembly Compiler
- 🌎 C: A Regular Expression Matcher
- 🌎 C: Regular Expression Matching Can Be Simple And Fast
- 🌎 Go: How to build a regex engine from scratch
- 🌎 JavaScript: Build a Regex Engine in Less than 40 Lines of Code
- JavaScript: How to implement regular expressions in functional javascript using derivatives
- 🌎 JavaScript: Implementing a Regular Expression Engine
- 🌎 Perl: How Regexes Work
- 🌎 Python: Build Your Own Regular Expression Engines: Backtracking, NFA, DFA
- 🌎 Scala: No Magic: Regular Expressions
- 🌎 CSS: A search engine in CSS
- Python: Building a search engine using Redis and redis-py
- 🌎 Python: Building a Vector Space Indexing Engine in Python
- 🌎 Python: Building A Python-Based Search Engine [video]
- 🌎 Python: Making text search learn from feedback
- 🌎 Python: Finding Important Words in Text Using TF-IDF
- 🌎 C: Tutorial - Write a Shell in C
549⭐84🍴C: Let's build a shell!)- 🌎 C: Writing a UNIX Shell
400⭐20🍴C: Build Your Own Shell)- 🌎 C: Write a shell in C
- 🌎 Go: Writing a simple shell in Go
- 🌎 Rust: Build Your Own Shell using Rust
- JavaScript: JavaScript template engine in just 20 lines
- 🌎 JavaScript: Understanding JavaScript Micro-Templating
- Python: Approach: Building a toy template engine in Python
- Python: A Template Engine
- Ruby: How to write a template engine in less than 30 lines of code
- 🌎 C: Build Your Own Text Editor
- C++: Designing a Simple Text Editor
- 🌎 Python: Python Tutorial: Make Your Own Text Editor [video]
- Python: Create a Simple Python Text Editor!
- 🌎 Ruby: Build a Collaborative Text Editor Using Rails
- 🌎 Rust: Hecto: Build your own text editor in Rust
- 🌎 Python: Developing a License Plate Recognition System with Machine Learning in Python
- 🌎 Python: Building a Facial Recognition Pipeline with Deep Learning in Tensorflow
- 🌎 C#: Writing a Web Server from Scratch
- 🌎 Node.js: Build Your Own Web Server From Scratch In JavaScript
- 🌎 Node.js: Let's code a web server from scratch with NodeJS Streams
960⭐58🍴Node.js: lets-build-express)- PHP: Writing a webserver in pure PHP
- Python: A Simple Web Server
- 🌎 Python: Let’s Build A Web Server.
- 🌎 Python: Web application from scratch
- Python: Building a basic HTTP Server from scratch in Python
- Python: Implementing a RESTful Web API with Python & Flask
- Ruby: Building a simple websockets server from scratch in Ruby
- (any): From NAND to Tetris: Building a Modern Computer From First Principles
- Alloy: The Same-Origin Policy
- C: How to Write a Video Player in Less Than 1000 Lines
3562⭐286🍴C: Learn how to write a hash table in C)- 🌎 C: The very basics of a terminal emulator
- 🌎 C: Write a System Call
- 🌎 C: Sol - An MQTT broker from scratch
6661⭐348🍴C++: Build your own VR headset for $200)- 🌎 C++: How X Window Managers work and how to write one
- 🌎 C++: Writing a Linux Debugger
- C++: How a 64k intro is made
- 🌎 C++: Make your own Game Engine
- 🌎 C#: C# Networking: Create a TCP chater server, TCP games, UDP Pong and more
- 🌎 C#: Loading and rendering 3D skeletal animations from scratch in C# and GLSL
- 🌎 Clojure: Building a spell-checker
- 🌎 Go: Build A Simple Terminal Emulator In 100 Lines of Golang
- 🌎 Go: Let's Create a Simple Load Balancer
328⭐12🍴Go: Video Encoding from Scratch)- 🌎 Java: How to Build an Android Reddit App [video]
3205⭐321🍴JavaScript: Build Your Own Module Bundler - Minipack)- 🌎 JavaScript: Learn JavaScript Promises by Building a Promise from Scratch
- 🌎 JavaScript: Implementing promises from scratch (TDD way)
- 🌎 JavaScript: Implement your own — call(), apply() and bind() method in JavaScript
188964⭐30334🍴JavaScript: JavaScript Algorithms and Data Structures)- 🌎 JavaScript: Build a ride hailing app with React Native
- 🌎 JavaScript: Build Your Own AdBlocker in (Literally) 10 Minutes
134⭐11🍴Kotlin: Build Your Own Cache)3283⭐198🍴Lua: Building a CDN from Scratch to Learn about CDN)- 🌎 Nim: Writing a Redis Protocol Parser
- 🌎 Nim: Writing a Build system
- 🌎 Nim: Writing a MiniTest Framework
- 🌎 Nim: Writing a DMIDecode Parser
- 🌎 Nim: Writing a INI Parser
- 🌎 Nim: Writing a Link Checker
- 🌎 Nim: Writing a URL Shortening Service
- 🌎 Node.js: Build a static site generator in 40 lines with Node.js
- 🌎 Node.js: Building A Simple Single Sign On(SSO) Server And Solution From Scratch In Node.js.
- 🌎 Node.js: How to create a real-world Node CLI app with Node
- 🌎 Node.js: Build a DNS Server in Node.js
- 🌎 PHP: Write your own MVC from scratch in PHP
- 🌎 PHP: Make your own blog
- 🌎 PHP: Modern PHP Without a Framework
- 🌎 PHP: Code a Web Search Engine in PHP
- 🌎 Python: Build a Deep Learning Library [video]
- 🌎 Python: How to Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes
- Python: Continuous Integration System
- 🌎 Python: Recommender Systems in Python: Beginner Tutorial
- 🌎 Python: Write SMS-spam detector with Scikit-learn
- Python: A Simple Content-Based Recommendation Engine in Python
- 🌎 Python: Stock Market Predictions with LSTM in Python
- 🌎 Python: Building a simple Generative Adversarial Network (GAN) using Tensorflow
- 🌎 Python: Learn ML Algorithms by coding: Decision Trees
99⭐8🍴Python: JSON Decoding Algorithm)- 🌎 Python: Build your own Git plugin with python
- Ruby: A Pedometer in the Real World
- 🌎 Ruby: Creating a Linux Desktop application with Ruby
4124⭐262🍴Rust: Building a DNS server in Rust)- 🌎 Rust: Writing Scalable Chat Service from Scratch
- 🌎 Rust: WebGL + Rust: Basic Water Tutorial
371⭐28🍴TypeScript: Tiny Package Manager: Learns how npm or Yarn works)
- Submissions welcome, just send a PR, or create an issue
- Help us review pending submissions by leaving comments and "reactions"
This repository is the work of many contributors. It was started by Daniel Stefanovic, and is now maintained by 🌎 CodeCrafters, Inc. To the extent possible under law, 🌎 CodeCrafters, Inc. has waived all copyright and related or neighboring rights to this work.
318167⭐ 29526🍴 codecrafters-io/build-your-own-x)