Simon Willison’s Weblog

18th September 2007 - Link Blog

ActsAsUndoable. Lawrence Carvalho shows how robust undo functionality can be added to a JavaScript application through careful application of the Memento design pattern.

Posted 18th September 2007 at 3:51 pm

Recent articles

Publishing WASM wheels to PyPI for use with Pyodide - 13th June 2026
Claude Fable is relentlessly proactive - 11th June 2026
Initial impressions of Claude Fable 5 - 9th June 2026

This is a link post by Simon Willison, posted on 18th September 2007.

actsasundoable 1 design-patterns 18 javascript 757 lawrence-carvalho 1 memento 1 undo 4 yui 33

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe