js for in 如何改为.map写法

Question

for (const i in data) {
        if (!data[i].children || data[i].children.length == 0) {
          data[i].pid = ""
          data[i].sort = i
        }
      }

以上代码如何转为.map的写法呢

Answer 1

data.map((item, i) => {
    if (!item.children || item.children.length == 0) {
          item.pid = ""
          item.sort = i
   }
})