JS: Object.getOwnPropertyNames

JS: Object.getOwnPropertyNames

Object.getOwnPropertyNames ( obj )

Return a array of all own string property keys. (Exclude symbol keys. Include non-enumerable ones).

[see JS: List Properties]

[see JS: Symbol Tutorial]

const obj = {3:4, 5:6};
console.log ( Object.getOwnPropertyNames ( obj ) );
// [ '3', '5' ]

const arr = [3, 4, 5];
console.log ( Object.getOwnPropertyNames ( arr ) );
// [ '0', '1', '2', 'length' ]
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