Observing whether a function is strict

Mark Miller erights at gmail.com
Thu May 26 15:02:51 UTC 2016

I don't get it. What is being removed? What purpose does this accomplish?

On Thu, May 26, 2016 at 4:03 PM, Claude Pache <claude.pache at gmail.com>

> Le 26 mai 2016 à 13:23, Mark S. Miller <erights at google.com> a écrit :
> On Thu, May 26, 2016 at 11:25 AM, Claude Pache <claude.pache at gmail.com>
> wrote:
>> > Le 26 mai 2016 à 10:43, G. Kay Lee <
>> balancetraveller+es-discuss at gmail.com> a écrit :
>> >
>> > I was under the impression that strict mode is a (temporary) workaround
>> to get rid of unwanted bad parts of the language without instantly breaking
>> anything. The long term question thus should be: do we have a timeline on
>> the final removal of non-strict behavior from the language, and establish
>> the "strict mode" as the one and only standard behavior. If so, then
>> introducing any additional language feature to help detecting
>> strict/non-strict is certainly not ideal.
>> AFAIK, there is no plan to remove non-strict mode.
>> And to be clear about my intentions, what I have in the back of my head
>> was certainly not "introducing any additional language feature to help
>> detecting strict/non-strict" (yuck!), but whether it makes sense to think
>> about a possible way to remove that leak from `Function#arguments` and
>> `Function#caller`. But it would be premature to consider that issue without
>> *at least* an answer to my original question: Are there other ways...?
> Hi Claude, what do you mean by "remove that leak"? Hypothetically, let's
> say you had such a test and that it was reliable. How would you use it
> remove the leak? (This is probably also the best way to clarify what
> precisely you mean by removing the leak.)
> Maybe that "leak", namely observing whether a function is strict, is not
> something to care about.
> But here is what I think to be a possible way to remove it: Because
> `Function#arguments` and `Function#caller` do return `null` for sloppy
> functions in some circumstances (namely, when the function is not found in
> the call stack), let them always return `null` for non-sloppy functions.
> —Claude
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