Spillem
A toy LISP implementation in Elm. Spillem is based on the wonderful mal (Make a Lisp) project. Spillem deviates from the mal spec due to the limitations of Elm (inability to read files, manipulate stdio, etc).
Interpreter Features
- Parser
- Ints, Lists, Symbols
- Eval
- Environments
- Functions/Lexical Closures
- Macros
- Atoms
- Quasi/Unquote
- Vectors
- Maps
- Try/Catch
- Meta-circular interpreter
Repl
Spillem also comes bundled with an interactive repl in a web UI. To access this, run elm reactor and open src/Repl.elm.
Why?
You will never truly understand a lexical closure until you have implemented one yourself. This project has helped me understand the nature of programming languages, interpreters, functional programming, etc. more than any other side project I have worked on.