JS: Reflect.ownKeys

New in ES2015.

Reflect.ownKeys ( obj )

Return a array of the object's keys. (including symbol keys and non-enumerable keys.)

[see JS: Symbol Tutorial]

[see JS: Property Attributes, writable, enumerable, configurable]

[see JS: List Properties]

const obj = {
 "y": 3,
 [Symbol("x")] : 4,
};

// list all properties of a object
console.log( Reflect.ownKeys(obj) ); // prints [ 'y', Symbol(x) ]

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