Literate in the fundamentals.of software engineering.

A green suite is a claim. This is what checking it looks like.

Each snippet below is the kind a competent model produces: clean, idiomatic, tests passing, and wrong in exactly one line.

1export function total(items) {
2  let sum = 0;
▸  for (let i = 0; i <= items.length; i++) {
4    sum += items[i].price;
5  }
6  return sum;
7}

The argument

Why software-engineering fundamentals, now.

The gyms

More than half of them close on the same track — reading what the model generated. Review is that track stretched to a whole gym.

How it works

How every gym works.

engineReal engine, not an animation.

Type actual commands. Watch the actual object model change. There are no fake dials and no cartoon graphs.

gradeGraded on state, not opinion.

Did the filesystem reach the target? Did the repository? Did your test notice the mutant? The engine checks, and it does not round up.

localLocal-first. Free forever.

No account, no backend, no analytics. Every byte of progress stays in your browser. It is the reason the whole thing can be free.

Or just ask the terminal

This site has been a shell since day one. It still is.

The cursor you followed down the page ends here, inside a real terminal (built on our own xterm-mock). Try:

• $ cd learn
• $ ls
• $ cat sql
• $ route sql
• $ cat Makefile
• $ help

guest@liter8:/

booting shell…

• License — A dependency is a legal contract, not an npm import.
• Review — Read the diff like it's lying to you
• Secure — Prove the exploit
• Debug — Find the fault before the clock does
• Test — A green suite is a claim
• Concurrency — The bug that only happens on the fourteenth Tuesday
• Regex — Say what it matches before you run it
• SQL — Read the plan, not the query
• Schema — Migrations that don't lock the table
• Net — Read the handshake, not the docs
• Shell — The last interface that does not guess what you meant
• Git — Practise on a real object model
• Vim — Practise until it becomes instinct
• System Design — Learn by operating systems
• Linux — Read the strace, not the man page
• Container — An image is a filesystem diff, not a zip
• Deploy — Declare the state, then watch the loop fight you
• Infra — Read the plan before you apply
• Run — Predict the state before you press run
• GitHub

Also on the workbench

Open-source tools in Rust, Go and TypeScript, and engineering notes on the blog.

• trabasRust
• go-mongr8Go
• xterm-mockTypescript
• engineering notes on the blog ↗