Object id, hash, etc?

Mark S. Miller erights at google.com
Tue Sep 8 18:44:51 UTC 2015


See Labeler at
http://wiki.ecmascript.org/doku.php?id=harmony:weak_maps#unique_labeler



On Tue, Sep 8, 2015 at 11:16 AM, joe <joeedh at gmail.com> wrote:

> Didn't send to list, something is wrong with my reply all. Sorry about
> that. Stupid mobile gmail.
> ---------- Forwarded message ----------
> From: "joe" <joeedh at gmail.com>
> Date: Sep 8, 2015 11:15 AM
> Subject: Re: Object id, hash, etc?
> To: "Garrett Smith" <dhtmlkitchen at gmail.com>
> Cc:
>
> I agree with this request. This is the logical complement to valueof, I
> think. And yes, for most ID use cases this isn't a good fit, but we're not
> talking about the general case, just the cases where a python style id()
> function *is* appropriate.
>
> Joe
> On Sep 8, 2015 9:08 AM, "Garrett Smith" <dhtmlkitchen at gmail.com> wrote:
>
>> On 9/8/15, Michael McGlothlin <mike.mcglothlin at gmail.com> wrote:
>> > Is there a reason not to provide an object id and hash value as other
>> > languages often do? I find myself defining an identity symbol on objects
>> > with a value from a simple global counter. It makes it easier to debug
>> if I
>> > can just look at a log and see what objects and functions were active.
>> >
>> > Likewise a hash value would simplify a lot of comparisons and make it
>> easier
>> > to debug.
>> >
>> > I especially find the ID useful when working with bound functions as
>> they
>> > can be difficult to tell apart. I like to change toString() to provide
>> the
>> > ID followed by the code (flattened to one line).
>> >
>> >
>>
>> NFE's are safe to use where IE8 support isn't needed*.
>> (function aa(){}).name; // "aa"
>>
>> As for using Object IDs and Object Pooling, lexically-scoped values
>> have benefits over global ID generators (as your counter). The values
>> can be passed in as a parameter to the Factory (useful with Private
>> Proxy). There other benefits to this pattern regarding memory
>> management and application design. Contact me if you'd like to learn
>> more.
>>
>> * https://kangax.github.io/nfe/
>> --
>> Garrett
>> @xkit
>> ChordCycles.wordpress.com
>> garretts.github.io
>> personx.tumblr.com
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>
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-- 
    Cheers,
    --MarkM
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