A small workbook for learning the Fe language via intentionally broken exercises.

All exercises live under lessons/.

• The fe CLI (this repo is tested with Fe v26.x, April 2026)
  • Recommended: curl -fsSL https://raw.githubusercontent.com/argotorg/fe/master/feup/feup.sh | bash
    • After install, restart your shell or run: source ~/.fe/env
  • macOS (Homebrew): brew install fe-lang/tap/fe
  • Updating later: feup (installed by the script above)
• Optional: solc if you want to use the Yul backend (--backend yul)
  • Provide via --solc <path> or FE_SOLC_PATH
• An editor with Fe syntax/LSP support (you can run fe lsp)
  • zed
  • emacs
  • neovim
  • vscode

• Each lesson has a README.md with run instructions.
• Exercises are meant to be fixed. Follow the PROBLEM: / EXERCISE: markers and compiler errors until things compile and tests pass.

• Lesson 00 — Getting Started: lessons/00-getting-started/README.md
• Lesson 01 — Language Basics: lessons/01-language/README.md
• Lesson 02 — Project Structure: lessons/02-project-structure/README.md