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

Experimenting with Starlette 1.0 with Claude skills - 22nd March 2026
Profiling Hacker News users based on their comments - 21st March 2026
Thoughts on OpenAI acquiring Astral and uv/ruff/ty - 19th March 2026

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

actsasundoable 1 design-patterns 18 javascript 746 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