The blog link on the website fleshes out the thinking a little further: http://blog.haskellformac.com/blog/from-the-read-eval-print-loop-to-playgrounds http://

The blog link on the website fleshes out the thinking a little further: http://blog.haskellformac.com/blog/from-the-read-eval-print-loop-to-playgrounds http://blog.haskellformac.com/blog/from-the-read-eval-print-... The author also had a blog post on it here: http://justtesting.org/post/103422773731/why-are-playgrounds-compelling http://justtesting.org/post/103422773731/why-are-playgrounds...