How to sum the digits of a number

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Algorithm to sum the digits of a number. function digitSum(n) { if ( ! ( typeof n === 'number' || n instanceof Number )) { return 0 ; } if (n <= 0 ) { return 0 ; } else if (n < 10 ) { return n; } else if (n === Infinity ) { return Infinity ; } return (n % 10 ) + digitSum((n / 10 ) >> 0 ); } Usage: console.log(digitSum( 1234 )); // 10 console.log(digitSum( 3890 )); 20 console.log(digitSum( Infinity…

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