.js

////////////////////////
// Solution #1 -- Adnan
////////////////////////
function pairs (obj) {
  var arr = [], key
  for (key in obj) arr.push([key, obj[key]])
  return arr
}
var string = document.body.innerText
var counts = {}, order
string.split('').forEach(function (d) { counts[d] = (counts[d] || 0) + 1 })
order = pairs(counts).sort(function (a, b) { return a[1] - b[1] }).reverse()
order.forEach(function (d) { console.log(d[0] + ':' + d[1]) })

///////////////////////
// Solution #2 -- Chris
///////////////////////
var str = "some loooooong string";

var obj = [];
for (var i=0; i<str.length; i++) {
  var letter = str[i];
  if (typeof obj[letter] == "undefined") {
 	  obj[letter] = 0; 	
  }

  obj[letter]++;
}

//array of strs
var r = [];
for (key in obj) {
  r.push(obj[key] +" : "+key);
}

r.sort().reverse();
for (var i=0; i< r.length; i++) {
  var tStr = r[i].split(":");
  console.log(tStr[1]+" : "+ tStr[0]);
}
///////////////////////
// Solution #3 -- Henry
///////////////////////

var string = "some loooooong string";
var myObj = {};

var charOccur = function (string) {
	//counted characters
	for (var i = 0; i < string.length; i++) {
		if (string[i] = myObj[string[i]]) {
			myObj[string[i]] = myObj[string[i]] + 1;
		} else {
			myObj[string[i]] = 1;
		}
	}
	//push each key value pair into array
	var myArray = [];
	for (key in myObj) {
		myArray.push(myObj[key] + ":" + key);
	}

	//sort myArray
  var sortedArray = myArray.sort(function(a,b){
    return parseInt(b) - parseInt(a);
  });

  // reverse the key and value
  _.each(sortedArray, function(index){
    var reverseFix = index.split(":").reverse().join(":");
    console.log(reverseFix);
  });
};

charOccur(string);