[Haskell-beginners] Implement semantic editor combinators

[Javran Cheng]

Hi,

I read Conal Elliott's "Semantic editor combinators" and write myself
a tutorial to answer how it works and give some observations about it,
here I want to share it with you:

http://javran.github.io/posts/2014-03-21-implement-semantic-editor-combinators.html

Hope you enjoy it and please feel free to give me comments and
indicate my misconceptions.

Thanks,

Javran