Mere Documentation

New here? Start with the Tour of Mere for a one-page overview of every core feature, then follow a tutorial to build something real.

Start here

• Tour of Mere
• Tutorial (mere)

Build something real

• Tutorial: build a REST API in Mere
• Tutorial: build a Redis client in Mere
• Tutorial: implement type inference in Mere

Reference

• Language reference (mere)
• Stdlib reference (mere)
• Patterns / cookbook (mere)
• Reserved names — Mere top-level fn names and C codegen collisions

Guides

• Memory management model (mere)
• Packages (v0.1)
• Database support
• HTTP demos
• Code generation (codegen)

Project

• Changelog (mere)

More

• Bare metal (the RV32I backend)
• Host builtin support, by backend
• The language server

Try Mere in your browser

Pre-compiled Mere programs running directly in your browser via Wasm:

• playground — hello / fizzbuzz / fibonacci, captured stdout
• counter — button-driven counter; Mere closure dispatched back from JS (Phase 48 frontend FFI)
• 2048 — the full sliding-tile game, playable with the arrow keys; keyboard events delivered to a Mere closure via dom_on_key
• RISC-V console — a Mere-authored RV32IM CPU (compiled to Wasm) running a Mere-authored cartridge (compiled by mere -rv to a flat RV32IM binary); arrow-key playable
• echo — mirrors textarea input; exercises the JS → Mere string boundary
• wordcount — chars / words / lines stats via a Mere string-scan; word boundaries fold runs of whitespace
• self-host fmt — Mere pretty-printer written in Mere, running in browser (Phase 49 §S1)
• self-host REPL — Mere evaluator written in Mere, running in browser (Phase 51 §S2.A)
• self-host type-checker — Mere HM type inferencer written in Mere, running in browser (Phase 52 §S2.B)
• self-host compiler — Mere Wasm codegen written in Mere, running in browser (Phase 53 §S3)

Run a Mere web backend

Real HTTP servers written in Mere (Phase 54.35). Run under Node.js locally — see examples/ and contrib/http/:

• http_echo_server.mere — minimal HTTP echo
• http_json_api.mere — six-endpoint JSON REST API with CORS via http_set_header
• http_todo_api.mere — in-memory TODO CRUD with top-level mutable Map[str, str] state
• http_docs_server.mere — serves this repo's own docs via read_file
• http_fmt_service.mere — self-host formatter (parser + fmt) exposed over HTTP
• http_fmt_webapp.mere — single-file web app: HTML UI + /fmt API in one wasm binary