How to get the sum of a number digit with out using loop or high-order functions?

[HmmamBabiKhouja]

like on this post I wanted to get the sum of a number digits using reduce

How to get total number from a number string using reduce?

like on the question’s title: how to get a total number from a string of numbers using reduce? now I’m aware of other ways to get the result but I’m more interested to understand the reduce() more to solve this I tried this total="1234"; console.log(total.split("").reduce((x,y) => y+=parseInt(x),Number(0))); "43210" the result was string, I tried parseInt() instead of Number() but the result was the same also, I tried to remove the accumulator 0 but the result was string too "4321" how t…

but when I checked google I found other ways to do so, one of these ways was

var value = 2568,
    sum = 0;

while (value) {
    sum += value % 10;
    value = Math.floor(value / 10);
}

console.log(sum);

now how to do this on one line as return