Right now this is my understanding of Javascript Objects... var a = {};
Object.defineProperties(a, {
one: {enumerable: true, value: 'one'},
two: {enumerable: false, value: 'two'},
});
a.__proto__ = {three : 'three' };
Object.keys(a); // ["one"]
Object.getOwnPropertyNames(a); // ["one", "two"]
for (var i in a) console.log(i); // one three
so
Object.keys(a);
Returns object's own keys that are also enumerable.
Object.getOwnPropertyNames(a); // ["one", "two"]
Returns object's own keys including non enumerable.
for (var i in a)
Returns object's and it prototype chain, only enumerable keys,
So how do you get non enumerable keys from prototype chain?
Code::
var o = {a:1};
Object.defineProperty(o,'b',{configurable:true, enumerable :false, value:2,writable: true });
o.__proto__ = {c:3};
Object.defineProperty(o.__proto__,'d',{configurable:true, enumerable :false, value:4,writable: true });
Object.keys(o); // ["a"] -only self nonenum props.
Object.getOwnPropertyNames(o); // ["a", "b"] -only self including enum props.
for (var i in o) console.log(i) // a c -only enum props including from proto.
