js统计字符串每个字符出现的次数

统计下面字符串中每个字符出现的频率

let str = "fgasdfadfdasd"
let result = {}

for (let i = 0; i < [...str].length; i++) {
  if (!result[[...str][i]]) {
    result[[...str][i]] = 1
  } else {
    result[[...str][i]]++
  }
}
console.log("方法一：", result)

let res = [...str].reduce((a, b) => {
  a[b] ? a[b]++ : a[b] = 1
  return a
}, {})
console.log("方法二：", res);

// 最简化
let res = [...str].reduce((a, b) => (a[b]++ || (a[b] = 1), a), {})
console.log("方法二：", res);