Determining if all attributes on a javascript object are null or an empty string

Question

What is the most elegant way to determine if all attributes in a javascript object are either null or the empty string? It should work for an arbitrary number of attributes

Answer 1

This skip the function attribute

function checkIsNull(obj){
		let isNull=true;
		for(let key in obj){
			if (obj[key] && typeof obj[key] !== 'function') {
				isNull = false;
			}
		}
		return isNull;
	}

var objectWithFunctionEmpty={
  "name":undefined,
  "surname":null,
  "fun": function (){ alert('ciao'); }
}

var objectWithFunctionFull={
  "name":undefined,
  "surname":"bla bla",
  "fun": function (){ alert('ciao'); }
}

checkIsNull(objectWithFunctionEmpty); //true
checkIsNull(objectWithFunctionFull); //false