javascript - How can we extract numbers one by one?

Question

This is what I have tried so far:

function MakesingleDigits(num) {
    let result = '' 
    let arr = String(num)
    for(let i = 0 ; i < arr.length; i++){
      result = result * arr[i] 

    }
      return result
  }

Let's explain my thinking

let arr = String(num)

This is used to change a number to a string type. I want to extract digits one by one, so I will be using for loop.

result = result * arr[i]

This calculates the result. My intention is that if I input num = 781, then I want to get the product of all digits, i.e. 7*8*1

How can I separate a number and extract all digits?

Answer 1

Are you looking for number's digit multiplication? if so here is solution

let num = 781;
let result = 1 ;
let digits = num.toString().split('');
let arr = digits.map(Number);
for (let i = 0, sum = 0; i < arr.length; result *= arr[i++]);
console.log(result);