#771 - Jewels and Stones

Easy • View on LeetCode • View on GitHub

Problem Description

You're given strings jewels representing the types of stones that are jewels, and stones representing the stones you have. Each character in stones is a type of stone you have.

You want to know how many of the stones you have are also jewels.

Letters are case sensitive, so "a" is considered a different type of stone from "A".

Solution

/**
 * @param {string} jewels
 * @param {string} stones
 * @return {number}
 */
var numJewelsInStones = function(jewels, stones) {
  const set = new Set(jewels);
  let result = 0;

  for (const stone of stones) {
    if (set.has(stone)) {
      result++;
    }
  }

  return result;
};