Problem 8 Sum Huge numbers

var BigNumber = require('./bignumber.js');
function sumTwoHugeNumbers(arr) {

    var digOne = new BigNumber(arr[0]);
    var digTwo = new BigNumber(arr[1]);
    var sum = new BigNumber(digOne + digTwo);
    return sum;
}
console.log(sumTwoHugeNumbers(['347135713985789531798031509832579382573195807',
 '817651358763158761358796358971685973163314321']
));