Create a function that returns the sum of the two lowest positive numbers given an array of minimum 4 integers. No floats or empty arrays will be passed.
For example, when an array is passed like [19, 5, 42, 2, 77], the output should be 7.
function sumTwoSmallestNumbers(numbers) {
var arr = numbers.sort(function(a,b) { return a-b; });
// console.log(arr);
return(arr[0] + arr[1]);
};