/**

  Functional Programming in JavaScript

  @author Luis Atencio

  IO Monad

 */

​

// Read contents of any element

var read = function (id) {

    return function () { 

       return document.getElementById(id).innerHTML;

    };

};

​

// Write contents to any element

var write = function(id) {  

   return function(value) {

       document.getElementById(id).innerHTML = value;

   };

};

​

// Converting the value in a DIV to snake case

IO.from(read('message')).

  map(_.snakeCase). 

  map(write('message')).run();

​

/*

  TODO: convert the value inside the DIV to upper case and repeat the message twice:

  Hint: the toUpperCase is your own custom lambda function

  Hint: Repeat is done by partially evaluating (_.partial) the _.repeat function with a 2.

  The output should be: HELLO FP!HELLO FP!

*/