Property order is not guaranteed, as object property enumeration is not specified according to the ECMAScript specification. In practice, however, most engines use insertion order to sort an object's properties, thus allowing for deterministic extraction.
If provided null or undefined, the function returns an empty array.
Parameters
value: any
input object
Returns
Array<symbol>
a list of own and inherited non-enumerable symbol properties
Example
var symbols = nonEnumerablePropertySymbolsIn( {} );
Returns an array of an object's own and inherited non-enumerable symbol properties.
Notes
null
orundefined
, the function returns an empty array.