Object.seal, read references, and code reliability

Bob Myers rtm at gol.com
Tue Aug 15 14:23:42 UTC 2017

> by immediately pointing out the error.

This does **not** "immediately point out the error". It would "point out
the error" (by raising an exception) only f and when the code path
involving the mistyped property name were actually followed. The thrown
error might be swallowed in some contexts, or disappear into the ether in a
production environment, or cause a server to crash.

We have had tools for immediately pointing out such errors for more than
half a century. They are called "compilers".

> with (almost?) no cost,

I will go out on a limb here and predict that the community would be
unlikely to accept any alternative which adds a nanosecond of cost.


On Tue, Aug 15, 2017 at 7:34 PM, Alex Kodat <akodat at rocketsoftware.com>

> Yup, I kinda liked strong mode but the good news/bad news was that you got
> a lot of behaviors in a single package which was convenient but also
> problematic if any of the behaviors proved inappropriate for a context.
> IMO, improving code reliability is trench warfare where progress is
> usually measured in inches and while I think Object.guard is a useful tool
> I’m under no illusions that it’s a game-changer (any more than Object.seal,
> say). But there are a large number of cases where when a programmer
> mistakenly types foo.bah as opposed to foo.bar it is inarguably a mistake
> and you’re doing the programmer a favor by immediately pointing out the
> error.  So if we could catch these cases relatively easily with (almost?)
> no cost, why not?
> I’ll concede that there are issues here that I and others have brought up
> that suggest that Object.guard is not quite as simple as Object.seal but I
> believe these issues are not so daunting as to disqualify the feature. But
> reasonable people could disagree.
> As far as performance goes, I don’t see how Object.guard could possibly
> improve performance. That’s not its purpose.
> ------
> Alex Kodat
> Senior Product Architect
> Rocket Software
> t: +1 781 684 2294 • m: +1 315 527 4764 • w: www.rocketsoftware.com
> *From:* Isiah Meadows [mailto:isiahmeadows at gmail.com]
> *Sent:* Tuesday, August 15, 2017 12:57 AM
> *To:* Alex Kodat <akodat at rocketsoftware.com>; Jordan Harband <
> ljharb at gmail.com>
> *Cc:* es-discuss at mozilla.org
> *Subject:* Re: Object.seal, read references, and code reliability
> Just a quick note: Look up "strong mode", an experiment by Google
> attempting to look for code quality improvement and perf gains for locking
> class instances by default. I feel it's pretty relevant here, and here's a
> quick summary of their general findings:
> 1. It helped code quality only *a little* (stuff better code design could
> solve better)
> 2. It had very little gain in performance
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