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🤓 Build your own (insert technology here)
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Build your own <insert-technology-here>
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
Tutorials
Build your own 3D Renderer
- 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
Build your own Augmented Reality
- 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
Build your own BitTorrent Client
- 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
Build your own Blockchain / Cryptocurrency
- 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
- JavaScript: A cryptocurrency implementation in less than 1500 lines of code
- JavaScript: Build your own Blockchain in JavaScript
- JavaScript: Learn & Build a JavaScript Blockchain
- 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
- 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
Build your own Bot
- 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
Build your own Command-Line Tool
- 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
Build your own Database
- 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
Build your own Docker
- 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]
- Python: A workshop on Linux containers: Rebuild Docker from Scratch
- Python: A proof-of-concept imitation of Docker, written in 100% Python
- Shell: Docker implemented in around 100 lines of bash
Build your own Emulator / Virtual Machine
- 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
Build your own Front-end Framework / Library
- JavaScript: WTF is JSX (Let's Build a JSX Renderer)
- 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]
Build your own Game
- 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
Build your own Git
- 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
Build your own Network Stack
- C: Beej's Guide to Network Programming
- C: Let's code a TCP/IP stack
- C / Python: Build your own VPN/Virtual Switch
- Ruby: How to build a network stack in Ruby
Build your own Neural Network
- 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
Build your own Operating System
- 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
- C: Build a minimal multi-tasking kernel for ARM from scratch
- C: How to create an OS from scratch
- C: Malloc tutorial
- C: Hack the virtual memory
- 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
Build your own Physics Engine
- 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
Build your own Programming Language
- (any): mal - Make a Lisp
- 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
- C: C interpreter that interprets itself.
- C: A C & x86 version of the "Let's Build a Compiler" by Jack Crenshaw
- 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]
- 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
- JavaScript: The Super Tiny Compiler
- 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
Build your own Regex Engine
- 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
Build your own Search Engine
- 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
Build your own Shell
- C: Tutorial - Write a Shell in C
- C: Let's build a shell!
- C: Writing a UNIX Shell
- 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
Build your own Template Engine
- 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
Build your own Text Editor
- 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
Build your own Visual Recognition System
- Python: Developing a License Plate Recognition System with Machine Learning in Python
- Python: Building a Facial Recognition Pipeline with Deep Learning in Tensorflow
Build your own Voxel Engine
Build your own Web Browser
Build your own Web Server
- 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
- 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
Uncategorized
- (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
- 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
- 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
- Go: Video Encoding from Scratch
- Java: How to Build an Android Reddit App [video]
- 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
- JavaScript: JavaScript Algorithms and Data Structures
- JavaScript: Build a ride hailing app with React Native
- JavaScript: Build Your Own AdBlocker in (Literally) 10 Minutes
- Kotlin: Build Your Own Cache
- 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
- 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
- Rust: Building a DNS server in Rust
- Rust: Writing Scalable Chat Service from Scratch
- Rust: WebGL + Rust: Basic Water Tutorial
- TypeScript: Tiny Package Manager: Learns how npm or Yarn works
Contribute
- Submissions welcome, just send a PR, or create an issue
- Help us review pending submissions by leaving comments and "reactions"
Origins & License
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.