You might consider taking a look at the recursion schemes section of my guide here: https://gist.github.com/bitemyapp/8739525 https://gist.github.com/bitemyapp/

You might consider taking a look at the recursion schemes section of my guide here: https://gist.github.com/bitemyapp/8739525 https://gist.github.com/bitemyapp/8739525