Object.equals() and Object.clone()

Isiah Meadows isiahmeadows at gmail.com
Tue Nov 15 02:02:13 UTC 2016


I agree. Also, consider iterables. Should their `Symbol.iterator` method be
called? There's no obvious behavior for the details, and people's opinions
differ on what should be correct.

On Mon, Nov 14, 2016, 20:58 Frankie Bagnardi <f.bagnardi at gmail.com> wrote:

It's pretty hard to decide how these behave, specifically with custom
classes. Focusing on Object.clone...

- with classes do you call the constructor, and with what arguments?
- HTMLElement and sub classes can't be constructed directly, what happens
with them?
- do you copy internal properties? this would make it hard to polyfill
- how does it behave with getters and setters?
- with regular expressions do you copy the lastIndex?

Most of those apply to Object.equals also.



On Mon, Nov 14, 2016 at 6:25 PM, Kevin Barabash <kevinb at khanacademy.org>
wrote:

It would be nice if deep equality checking and deep cloning of objects was
included in the standard library.  Has there been any proposals around
including these in the past?

– Kevin


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