Rank

Rank is a modern BASIC for small screens and big algorithms.

• Data-first pipelines: values flow through functions from left to right.
• Multidimensional arrays, broadcasting, and operations by rank or axis.
• Lazy sequences, ranges, and generators.
• Functions, closures, and memoization.
• A notebook-style CLI: edit cells, rerun code, and see results alongside it.
• LLM-aided Rust rewrite: export a task, generate Rust, check it against Rank.

Project Euler #2: sum the even Fibonacci numbers. Start with 100, edit the limit to 4 million, press Ctrl-R. Answer: 4613732.

Run

Requires Node.js 22.12 or newer, Python, and a C++20 build toolchain.

Open the REPL without a global install:

npx @arrrank/cli

npx downloads the package to its cache on the first run. For a permanent rank command:

npm install -g @arrrank/cli
rank

Or run from source:

npm install
npm run build
npm run rank

rank> use numbers
rank> 2 + 3 * 4
14
rank> 1 to 5 sum
15

Run a file, optionally passing inputs:

npx @arrrank/cli demos/euler/001_multiples.ra --limit 10

Tests

npm test
npm run rank -- test demos/euler

Documentation

• Language specification and standard library
• CLI and editor
• Rust rewrite tools and Euler 1–10 rewrites
• Example programs
• Contribution guidelines