const obj = {a:10,b:{d:{e:50,f:60}}}
// c:[20,30,40],
function clone(val){
    
    if(typeof val === "object"){
        return 
    }
}

let value = Object.keys(obj).map(function abc(item){
    if(typeof val === "object"){
       return {[item]:{...abc(item)}}
    }
    return {[item]:obj[item]}
}).reduce((acc, curr)=>  {
 //console.log(acc, curr)
 return {...acc, ...curr}
}, {})
//value = 
value.b.d.e = 100
console.log(value, obj)