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#202 Happy Number.js

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/**

* @param {number} n

* @return {boolean}

*/

var isHappy = function(n) {

var sum = 0;

var temp;

var hash = {};

while(n){

while(n!==0){

temp = n%10;

sum = sum+temp*temp;

n = Math.floor(n/10);

}

if(sum===1){

return true;

}

if(!hash[sum]){

hash[sum] = 1;

}else{

return false;

}

n = sum;

sum = 0;

}

};