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' ]

Reference

ECMAScript 2015 §Fundamental Objects#sec-object.getownpropertynames

Liket it? Put $5 at patreon.

Or, Buy JavaScript in Depth