- Reflect.ownKeys()

Note that the enumeration order for the for in loop is not as strictly defined as for the above functions, but usually, the enumeration of own properties occurs in the order described above.

Since the for in loop also enumerates properties in the prototype chain, after enumerating own properties, it will move up the prototype chain, enumerating the properties of each prototype object in the same order as described above.

If a property has already been enumerated, any property with the same name will not be enumerated again.

A property will not be enumerated, even if an enumerable property with the same name has already been considered.

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