https://news.ycombinator.com/item?id=6725387 has some commentary on the <30 line JS spreadsheet. It includes some interesting discussion on functional "spreadsheet" implementation with Haskell.
Neat! Few other additions and historical artifacts:
0: HTML(/SVG/plaintext) sandbox in dataURI under 1kB: https://gist.github.com/myfonj/c8ce74bf549e19600026ce9022388... (persistence in location.hash, sadly blocked in Chrome recently)
1: similar, quite famous "MiniCodeEditor", even smaller, served from file (2013): http://xem.github.io/miniCodeEditor/ (https://news.ycombinator.com/item?id=6860642)
2: famous "Spreadsheet in 30 LOC" (2013): https://jsfiddle.net/ondras/hYfN3/ (https://news.ycombinator.com/item?id=6725387)
https://news.ycombinator.com/item?id=6725387 has some commentary on the <30 line JS spreadsheet. It includes some interesting discussion on functional "spreadsheet" implementation with Haskell.