λab (a.k.a. LambdaLab) is an interactive λ-calculus interpreter for learning.
λab is written in TypeScript and has a command-line interface and a Web-based visual interface. To get started with both, you'll need Node. First, clone the repository. Then you'll need to compile the source to JavaScript.
You can get the TypeScript compiler and other dependencies from npm by typing npm install or just yarn if you have that.
To build the Web interface, type npm run build-web or yarn run build-web. This will create a webpacked JavaScript bundle called lambdalab.bundle.js. Open the index.html file in your browser.
The main <script> for the Web interface is lambdalab.ts.
To build the command-line version, type npm run build-cli or yarn run build-cli. Use node build/lc.js to run the script directly. Or type npm link or yarn link to symlink an lc executable; then, as long as the right directory is on your $PATH, you can just type lc.
The main entry point for the CLI tool is lc.ts.
Use yarn test or npm test to build the source for the tests and run them.