Question

题目内容

解题思路

字符串转换为数组应用累加器求值。

代码实现

const lengthOfLongestSubstring = (s: string): number => {
  let max: number = 0;
  if (s.length <= 1) return s.length;
  s.split("").reduce<string>((acc: string, value: string) => {
    const len = acc.indexOf(value);
    if (len === -1) {
      acc += value;
      max = acc.length > max ? acc.length : max;
      return acc;
    } else {
      acc += value;
      return acc.slice(len + 1);
    }
  }, "");
  return max;
};