js 对象转换为对象数组?

Question

原始数据：

const obj = {
  "a":[
    "a1","a2"
  ],
 "b":[
    "b1","b2","b3" // 数组内个数不定
  ],
 //......
}

目标数据：

const list = [
  {
    id: 1,
    name: 'a', 
    childList:[
      {id: 3, name: 'a1'},
      {id: 4, name: 'a2'},
    ]
  },
  {
    id: 2,
    name: 'b',
    childList:[
      {id: 5, name: 'b1'},
      {id: 6, name: 'b2'},
      {id: 7, name: 'b2'},
    ]
  }
]

Answer 1

let obj = {
  "a":[
    "a1","a2"
  ],
 "b":[
    "b1","b2","b3" // 数组内个数不定
  ],
 //......
}
let id=1;
Object.entries(obj).reduce((acc,[name, val])=>{
    acc.push({id:id++, name, childList:val.map(name=>({id:id++, name}))});
    return acc;
},[])

Answer 2

const keys = Object.keys(obj);
let order_children = keys.length;
const list = [];
for(let i=0;i<keys.length;i++){
    let key = keys[i];
    const row = {
        id:i+1,
        name:key,
        childList:[]
    }
    for(let j=0;j<obj[key].length;j++){
        row.childList.push({
            id:++order_children,
            name:obj[key][j]
        })
    }
    list.push(row);
}

Answer 3

function transformation(obj) {
  const keys = Object.keys(obj)
  let id = keys.length;
  return keys.map((key, index) => ({
    id: index + 1,
    name: key,
    childList: [
      ...(obj[key].map(item => ({
        id: ++id,
        name: item,
      })))
    ]
  }))
}

Answer 4

function setFormat(objs){
     return Object.entries(objs).reduce((arrs,[name,arr],index)=>{
        arrs.push({
           id:++index,
           name,
           children:arr.map((item1,index1)=>({id:++index1, name:item1}))
        })
        return arrs;
    },[])
}