Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
3.6k views
in Technique[技术] by (71.8m points)

js 双重for循环优化为.map写法

 let permissionId = []
      for (const i in menuList) {
        for (const j in permission) {
          if (menuList[i].id == permission[j].id) {
            permissionId.push(menuList[i].id)
          }
        }
      }

以上代码如何优化为.map的写法呢

在这里先谢谢各位大神们的解答了,小弟感激不尽!


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)
const map = permission.reduce((r, i) => (r[i.id] = true, r), {})
const permissionId = menuList.filter(i => !!map[i.id]).map(i => i.id)

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...