数组数据结构转换求老司机指点！

Question

vararr=[{depName:"技术部",depid:5,list:[{id:1,name:'前端开发',posid:1,eid:1},{id:4,name:'后端开发',posid:2,eid:2},]},{depName:"财务部",depid:5,list:[{id:10,name:'财务员',posid:32,eid:2},{id:3,name:'会计',posid:5,eid:7},]}]期望得到：vararr={"技术部":["前端开发","后端开发"],"财务部":["财务员","会计"],}大佬们帮我看看，谢谢谢谢。

Answer 1

arr.reduce((obj,item)=>{
obj[item.depName]?null:obj[item.depName]=[]
item.list.forEach(i=>{
obj[item.depName].push(i.name)
})
returnobj
},{})
                            

Answer 2

varobj={};
for(leti=0;iletdepName=arr[i].depName
letnewArr=[];
letnewList=arr[i].list;
for(letj=0;jnewArr.push(newList[j].name)
}
obj[depName]=newArr
}