JavaScript: Reflect.ownKeys
New in JS2015.
Reflect.ownKeys(obj)
- Return a Array of the object's keys. (including Symbol keys and non-enumerable keys.)
const obj = { "y": 3, [Symbol("x")] : 4, }; // list all properties of a object console.log( Reflect.ownKeys(obj) ); // prints [ 'y', Symbol(x) ]