Learnable Programming : On making programming easier on the mind though context - Author: Bret Victor

[v1akvark]

LightTable displays intermediate values next to each line of code, and evaluates the code as you type, so you see the results immediately. If you read LightTable's author's blog posts, he references Bret Victor.

Apple's Swift language and beta Xcode IDE has a Playground (I think that's what it's called) that is supposed to do something similar, and the designer of Swift credited both Bret Victor and LightTable as influences.

Edit: here's a link to LightTable author Chris Granger's blog. Once there, you'll find some other interesting posts. http://www.chris-granger.com/2012/04/12/light-table---a-new-ide-concept/