Easy) 771. Jewels and Stones

 

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

Jewels and Stones - LeetCode

javascript

/**
 * @param {string} J
 * @param {string} S
 * @return {number}
 */
const numJewelsInStones = function (J, S) {
  const stons = [...S]
  let numJewelsInStone = 0
  for (let i = 0; i < stons.length; i++) {
    if (J.includes(stons[i])) {
      numJewelsInStone++
    }
  }
  return numJewelsInStone
};

typescript

const numJewelsInStonesTS = function (J: string, S: string): number {
  const stons: string[] = [...S]
  let numJewelsInStone: number = 0
  for (let i = 0; i < stons.length; i++) {
    if (J.includes(stons[i])) {
      numJewelsInStone++
    }
  }
  return numJewelsInStone
};

golang

func numJewelsInStones(J string, S string) int {
	jewels := make(map[rune]bool)
	for _, jewel := range J {
		jewels[jewel] = true
	}
	numJewelsInStone := 0
	for _, stone := range S {
		if jewels[stone] {
			numJewelsInStone++
		}
	}
	return numJewelsInStone
}

/*
func numJewelsInStones(J string, S string) int {
	num := 0
	for _, jewel := range J {
		for _, stone := range S {
			if jewel == stone {
				num++
			}
		}
	}
	return num
}
*/