JAVASCRIPT

sum of digits in a whole number javascript

sum = 0;
while (value) {
    sum += value % 10;
    value = Math.floor(value / 10);
}

javascript sum digits in string of numbers

const sumDigits = num => num.toString().split('').map(Number).reduce((a,b) => a + b);
//usage: mySum=sumDigits(myNum); console.log(sumDigits(1234)) output: 10

javascript Program for Sum of the digits of a given number

<script>
 
// Javascript program to compute sum of digits in
// number.
 
/* Function to get sum of digits */
function getSum(n)
{
    var sum = 0;
    while (n != 0) {
        sum = sum + n % 10;
        n = parseInt(n / 10);
    }
    return sum;
}
 
// Driver code
var n = 687;
document.write(getSum(n));
 
</script>

js sum digits

// Sum of all the digits of a number in Javascript
const num = 1245,
    sum = num
        .toString()
        .split('')
        .map(Number)
        .reduce((a,b) => a + b);
console.log(sum); // 12