Paste code, get it in plain English: one paragraph of overview, then notes
lined up beside the exact lines they describe. It opens on a
15-line reduce that is quietly doing four jobs at once —
already explained, including the two ways it can lie to you. Bring an
Anthropic key to run it on your own code.
Edits re-render the listing as you type. Any language works — the syntax colouring is tuned for JavaScript, the explanation is not.
This browser would not let the page write to your clipboard, so here it is instead — already selected, ready for Ctrl/Cmd + C.