Convert number to tens, hundreds, thousands and so on - JavaScript

We are required to write a function that, given a number, say, 123, will output an array −

[100,20,3]

Basically, the function is expected to return an array that contains the place value of all the digits present in the number taken as an argument by the function.

We can solve this problem by using a recursive approach.

Example

Following is the code −

const num = 123;
const placeValue = (num, res = [], factor = 1) => {
   if(num){
      const val = (num % 10) * factor;
      res.unshift(val);
      return placeValue(Math.floor(num / 10), res, factor * 10);
   };
   return res;
};
console.log(placeValue(num));

Output

This will produce the following output in console −

[ 100, 20, 3 ]