I implemented a function that sorts an array of integers based on the sum of their digits. If two numbers have equal digit sums, then it sorts by the numerical values. Here is the function:
function digitSum(n){
var result = 0;
while (n) {
result += n % 10;
n /= 10;
}
return result;
}
function digitalSumSort(arr) {
arr.sort(function(x, y) {
return digitSum(x) != digitSum(y) ? digitSum(x) - digitSum(y) : x - y;
});
return arr;
}
While this function works correctly most of the time, it failed with the following test data:
Input: [100, 22, 4, 11, 31, 103]
Output: [100, 11, 31, 4, 22, 103]
Expected Output: [100, 11, 4, 22, 31, 103]
I am struggling to identify why it behaves unexpectedly in this case and how I can rectify it.
Note: It is crucial to keep the code as concise as possible.
Edit:
Although this question has been resolved previously, I encountered the same issue recently which prompted me to revisit it. Is there a technique to ensure that a var behaves like an integer instead of a double when assigned a numeric value? I am aware of using floor for this purpose, but sometimes I prefer standard integer operations over double ones (due to potential performance advantages or other reasons).