Why Object.assign can't implement deep copy?

[godkun]

Why Object.assign can't implement deep copy, if you can add a flag parameter to achieve deep copy, it will be perfect!!

[ljharb]

Object.assign is variadic, so there’s no place to accept a flag.

See https://github.com/tc39/ecma262/blob/master/CONTRIBUTING.md for how to suggest a feature the language, but a deep copy that isn’t a structured clone (for which generic algorithms don’t yet exist in the language) would be very fragile.

In practice, I’ve found when i need a deep copy, it’s a code smell, and i can achieve a better solution by rearchicitecting to not need one - but that’s just my personal experience.

[ljharb]

Object.assign is variadic, so there’s no place to accept a flag.

See https://github.com/tc39/ecma262/blob/master/CONTRIBUTING.md for how to suggest a feature the language, but a deep copy that isn’t a structured clone (for which generic algorithms don’t yet exist in the language) would be very fragile.

In practice, I’ve found when i need a deep copy, it’s a code smell, and i can achieve a better solution by rearchicitecting to not need one - but that’s just my personal experience.