JS get the attribute values nested in the object

    let data={
    
      b:{
    
        c:{
    
          d:' study hard '
        }
      }
    };
   let arr = ['b','c','d'];
  let result =  arr.reduce((res,key)=>res[key],data)
  console.log("result yes ");
  console.log(result);//  study hard 
 //  Add , How to get arr Array 
  getKeys(value){
    
      console.log(Object.keys(value)[0])
      if(typeof value =='string') return;
      this.arr.push(Object.keys(value)[0]);
      this.getKeys (value[Object.keys(value)[0]])
    },