从阵列中删除重复的人，只留下同一人的一条评论

Question

示例

commentsArray = ["John?mycomment284","Sophie?mycomment938","John?mycomment595"]

结果：commentsArray = ["John?mycomment284","Sophie?mycomment938"]

所有注释均以“？”与名称分开

如何每人只发表一条评论？并从同一个人中删除所有其他人。

Answer 1

const commentsArray = ["John?mycomment284","Sophie?mycomment938","John?mycomment595"]

const res = Object.values(commentsArray.reduce((acc, cur) => acc[cur.split('?')[0]] ? acc : (acc[cur.split('?')[0]] = cur, acc), {}))

console.log(res)

Answer 2

使用过滤器：

const commentsArray = ["John?mycomment284","Sophie?mycomment938","John?mycomment595"]
let people=[];
let firstComment = commentsArray.filter(comment => { 
      let person = comment.split("?")[0];
      if (people.indexOf(person) ==-1) {
        people.push(person);
        return comment;
      }  
    });
console.log(
  firstComment
)