查找并输出字符串中出现次数最多的字母和出现的次数

偶然看到这道题，觉得出现频率挺高，貌似经常考，自己试着写了一遍，貌似看着有点不优雅，欢迎高手指教～

  //思路： 1.数组先排序
  //      2.两组指针，一组指针记录历史次数最多字母及次数，一组指针记录当前字母及出现次数

  getA() {
    let a = 'sfgsdufegfvuidsvbeaaaaaaaaaiyvgsdfaaaasdassdshdashhbsdjghiuyhhg';
    let arr = Array.from(a).sort();
    let maxCount = 0,maxString = arr[0],currentCount = 1,currentString = arr[0];

    arr.forEach((v,i) => { 
      currentString = v;

      if(v === arr[i+1]){
        currentCount++;
      }else{

        if(maxCount < currentCount){
          maxCount = currentCount;
          maxString = currentString;
        }else if(maxCount == currentCount){

          if(typeof maxString === 'string'){
            maxString = Array.from(maxString)
            maxString.push(currentString);
          }else maxString.push(currentString)

        }
        currentCount = 1;
      }
    })

    return typeof maxString === 'string' ? [maxString,maxCount] : [maxString.join(' '),maxCount]
  }

  // 输出方式具体看题目要求
  console.log(...getA());