Object.getOwnPropertyNames example

gistfile1.js

var arr = ["a", "b", "c"];
print(Object.getOwnPropertyNames(arr).sort()); // prints "0,1,2,length"
 
// Array-like object
var obj = { 0: "a", 1: "b", 2: "c"};
print(Object.getOwnPropertyNames(obj).sort()); // prints "0,1,2"
 
// Printing property names and values using Array.forEach
Object.getOwnPropertyNames(obj).forEach(function(val, idx, array) {
  print(val + " -> " + obj[val]);
});
// prints
// 0 -> a
// 1 -> b
// 2 -> c
 
// non-enumerable property
var my_obj = Object.create({}, 
                           { getFoo: { value: function() { return this.foo; }, 
                                       enumerable: false 
                                      } 
                           });
my_obj.foo = 1;
 
print(Object.getOwnPropertyNames(my_obj).sort()); // prints "foo, getFoo"