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.
throws
second argument must be a positive integer
Parameters
value: any
input object
Optional level: undefined | number
inheritance level
Returns
Array<string | symbol>
a list of inherited writable property names and symbols
Returns an array of an object's inherited writable property names and symbols.
Notes
null
orundefined
, the function returns an empty array.second argument must be a positive integer