Count the Digits That Divide a Number

# 2520. Count the Digits That Divide a Number

Given an integer num, return the number of digits in num that divide num.

An integer val divides nums if nums % val == 0.

### Example 1:
“`
Input: num = 7
Output: 1
Explanation: 7 divides itself, hence the answer is 1.
“`

### Example 2:
“`
Input: num = 121
Output: 2
Explanation: 121 is divisible by 1, but not 2. Since 1 occurs twice as a digit, we return 2.
“`

Constraints:
“`
1 <= num <= 109 num does not contain 0 as one of its digits. ```

/**
 * @param {number} num
 * @return {number}
 */
 var countDigits = function(num) {
    const numStr = `${num}`;
    let cnt = 0;
    for (let i = 0; i < numStr.length; i++) {  
        if(num % +numStr[i] === 0) cnt++;
    }    
    return cnt;
};