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Computer science fundamentals

Build Your Own X: systems and tools from scratch

The planned outline of 19 modules. Lessons are written, run and reviewed before they are published.

Coming soon 19 modules

Coming soon. This track is being written. Below is its planned outline: a lesson appears here once its examples have been run and its technical review is signed off.

Planned outline

  1. Module 1

    Start here: stages, testers and bytes

    Coming soon
  2. Module 2

    A grep with its own regex engine

    Coming soon
  3. Module 3

    A POSIX-flavoured shell

    Coming soon
  4. Module 4

    A terminal text editor

    Coming soon
  5. Module 5

    An HTTP/1.1 server and a first look at HTTP/2

    Coming soon
  6. Module 6

    A DNS server and an iterative resolver

    Coming soon
  7. Module 7

    A userspace TCP/IP stack over TUN/TAP

    Coming soon
  8. Module 8

    A Redis-compatible key-value server

    Coming soon
  9. Module 9

    Version control in Git's repository format

    Coming soon
  10. Module 10

    Reading and writing the SQLite file format

    Coming soon
  11. Module 11

    A broker that speaks the Apache Kafka protocol

    Coming soon
  12. Module 12

    An interpreter for Kolam in any language

    Coming soon
  13. Module 13

    An emulator: a CHIP-8 interpreter, then a 6502 computer

    Coming soon
  14. Module 14

    A template engine with contextual auto-escaping

    Coming soon
  15. Module 15

    A browser engine: HTML, CSS, layout and paint

    Coming soon
  16. Module 16

    A BitTorrent client

    Coming soon
  17. Module 17

    A terminal coding agent

    Coming soon
  18. Module 18

    A container runtime for Linux

    Coming soon
  19. Module 19

    Make it solid: fuzzing, differential tests and speed

    Coming soon

Related tools

Hex Viewer & File Inspector A private hex viewer for files of any size, with a data inspector and file-type detection. Hash Generator Hashes and HMACs of text or huge files, plus checksum verification. CRC Calculator (CRC-8/16/32/64) Every catalogued CRC, custom parameters, checksums and C code — for text, hex or files. Regex Tester Live matches, capture groups and replace preview — safe from runaway patterns. SQLite Online (SQL Playground) A full SQLite database in your browser — open, query, import, export. DNS Lookup Every DNS record type, straight from a public DNS resolver, explained in plain words.

Official documentation

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