var cc=db.robert.find().limit(4)
for (var ldata = cc; ldata.hasNext();) {
var sudata=ldata.next();
print(typeof(sudata));
//print(JSON.stringify(sudata));
for (let[i, key]of Object.keys(sudata).entries()) {
if(JSON.stringify(sudata[key])==='[]'){
print(i + ", key : " + key + " , data : " + sudata[key] );
delete sudata[key];
}
}
print(JSON.stringify(sudata));
}