Question

How to sum the factorials of the digits of a number in TypeScript

Answer 1

function factorial(n: number) {
    return (n == 1 || n == 0) ? 1 : n * factorial(n - 1);
}

function sumFactorialDigits(num: number) {
    let sum: number = 0;
    
    while (num != 0) {
        sum += factorial(Math.trunc(num % 10));
        num = Math.trunc(num / 10);
    }
    
    return sum;
}

let num: number = 345;

console.log("sum factorial digits = " + sumFactorialDigits(num));




/*
run:
   
"sum factorial digits = 150" 
   
*/

 

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