JavaScript: Object.getOwnPropertyNames

By Xah Lee. Date: . Last updated: .
Object.getOwnPropertyNames(obj)
Return a Array of all own string property keys. (Exclude Symbol keys. Include non-enumerable ones).
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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