Claude Pache wrote:
Le 4 août 2013 à 01:39, Brendan Eich<[email protected]> a écrit :
Brendan Eich wrote:
Claude Pache wrote:
Fixing `typeof` of old (null) and new value types would be a solution, but I'm
rather definitely considering something like the defunct `Object.isObject()`
I forgot to add that my patch for
https://bugzilla.mozilla.org/show_bug.cgi?id=749786 includes
Object.isObject(x) // false unless x is an object
Object.isValue(x) // true for primitives and value objects
The idea: isObject returns true for all the new value object types and the
reference-semantics objects found in JS today, while isValue returns true for
all compare-by-value types, whether the legacy primitives (undefined, null,
boolean, number, string) or the new-in-ES7 value objects.
/be
Ok. What I am most interested, when I test for an "object", is roughly that I
am able to get or set properties on it (ignoring restrictions or special cases like
freezing, etc., and, in order to shorten the test, forgetting functions that are not
supposed to occur).
Value objects are non-extensible, no-own-property (so effectively
frozen), compare-by-value objects.
Or that it can be used like an object created by `new Object` (an
Object-like). This probably coincides with `!Object.isValue`. Likely, I won't
want to treat `1L` like `{ }` and differently from `1`.
Right, you want !Object.isValue(x).
That numbers are non-objects but int64 are objects is much more an
implementation detail than a relevant distinction for the programmer.
Yes, that's intentional. I'm not sure we need the
Object.is{Object,Value} APIs but they might be handy. Could go in the
to-be-named Reflect module instead.
So, I consider that `typeof int64(0) === "object"` and your `Object.isObject` are about
as useless than `typeof null === "object"`.
You could be right -- if it's useless we should cut it. But it does
provide a bit of information that's not the same as !Object.isValue, and
which is a bit clumsy to piece together otherwise.
/be
—Claude
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