関連ワード:  java check if an object is empty    how to check if an object is empty in javascript    how to check if an object is empty    how to check if an object is empty in typescript    how to check if an object is empty or not    how to check if an object is empty in python    how to check if an object is empty in c#    how to check if an object is empty or not in js    how to check if an object is empty in react    how to check if an object is empty in ts