// Leetcode #202

// Language: Javascript

// Problem: https://leetcode.com/problems/happy-number/

// Author: Chihung Yu

/**

* @param {number} n

* @return {boolean}

*/

var isHappy = function(n) {

if(n === null){

return false;

}

var val = n;

var hash = {};

while(!hash[val]){

if(val === 1){

return true;

}

hash[val] = true;

var sn = val + '';

var sarr = sn.split('');

var total = 0;

for(var i = 0; i < sarr.length; i++){

si = parseInt(sarr[i]);

total += Math.pow(si,2);

}

val = total;

}

return false;

};