Does JS object have properties?

object-has-AtLeastOne-property.js

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

// ALT for more modern JS
if (Object.keys(obj).length > 0 )
  return true;
else
  return false;


//ALT #2. see also https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames
var propsArray = Object.getOwnPropertyNames(obj)
/*
Diff is Whether the returned list includes the non-enumerable properties: Object.keys() does not return them, while Object.getOwnPropertyNames() does.

var x = ["a", "b", "c", "d"];
Object.keys(x);  //[ '0', '1', '2', '3' ]
Object.getOwnPropertyNames(x);  //[ '0', '1', '2', '3', 'length' ]

--
Object.getOwnPropertyNames(a) returns all own properties of the object a. 
Object.keys(a) returns all enumerable own properties. 
It means that if you define your object properties without making some of them enumerable: false ,
these two methods will give you the same result.

It's easy to test:

var a = {};
Object.defineProperties(a, {
    one: {enumerable: true, value: 'one'},
    two: {enumerable: false, value: 'two'},
});
Object.keys(a); // ["one"]
Object.getOwnPropertyNames(a); // ["one", "two"]
If you define a property without providing property attributes descriptor (meaning you don't use Object.defineProperties), for example:

a.test = 21;
then such property becomes an enumerable automatically and both methods produce the same array.
*/