for(var i in obj) return false; 
return true;

return JSON.stringify(obj) === '{}';

return Object.keys(obj).length === 0;

return Object.entries(obj).length === 0;

return Object.getOwnPropertyNames(obj).length === 0;

return Object.keys(obj).length === 0 && obj.constructor === Object;

return typeof obj === "undefined" || !Boolean(Object.keys(obj)[0]);

return Object.entries(obj).length === 0 && obj.constructor === Object;

return Object.values( obj  ).every( val => typeof val === "undefined" );

for (const key in obj) {
    if (hasOwnProperty.call(obj, key)) {
      return false
    }
}
return true;

for(var prop in obj) {
    if(obj.hasOwnProperty(prop)) {
      return false;
    }
}

for(var prop in obj) {
    if(obj.hasOwnProperty(prop))
      return false;
}

return true;

for (var k in obj)
{ 
    if ( obj.hasOwnProperty(k) )
    { 
      return false;
    } 
}
return true; 

return Object.getOwnPropertyNames(obj).length === 0 &&
       Object.getOwnPropertySymbols(obj).length === 0 &&
       Object.getPrototypeOf(obj) === Object.prototype; 

return !(Object.getOwnPropertyNames != undefined ? Object.getOwnPropertyNames(obj).length != 0 : (function(){for(var key in obj) break; return (key != null) && (key != undefined);})())