771. Jewels and Stones

https://leetcode.com/problems/jewels-and-stones/

JavaScript

/**
 * @param {string} J
 * @param {string} S
 * @return {number}
 */
var numJewelsInStones = function(J, S) {
  let count = 0
  for (let s of S.split('')) {
    if (J.indexOf(s) >= 0) {
      count++
    }
  }
  return count
}

Python

class Solution:

    def numJewelsInStones(self, J, S):
        """
        :type J: str
        :type S: str
        :rtype: int
        """
        count = 0
        for s in S:
            if s in J:
                count += 1
        return count