Here's my (more formalized) proposition. I also have added a proposed
@@isInstance property for the `isa` equivalent for @@hasInstance. I know
this was mostly put on hold initially because of my lack of proper
formulation, but here it is.
### Rationale: ###
Include an `isa` operator to
On Tue, Aug 26, 2014 at 3:56 AM, Brendan Eich bren...@mozilla.org wrote:
ES4 had 'is' as a type-classifying operator:
http://wiki.ecmascript.org/doku.php?id=proposals:is_as_to
http://wiki.ecmascript.org/doku.php?id=discussion:is_as_to
It would be a mistake to define 'is' without defining
I stand corrected on the creation aspect.
Isiah Meadows
On Aug 25, 2014 9:56 PM, Brendan Eich bren...@mozilla.org wrote:
Isiah Meadows wrote:
Cc the list...
On Aug 25, 2014 6:06 PM, Isiah Meadows impinb...@gmail.com mailto:
impinb...@gmail.com wrote:
There really shouldn't be any
Python, Coffeescript and VB use the is operator for object identity, not
for instanceof like functionality. Dart uses the is operator analogous to
instanceof. It would seem to me it'd be beneficial to pick a different
operator name, in order to avoid the fuddled meaning this operator has
taken to
I know it's just a sketch but that `Object.prototype.is` does not play well
with `Object.create` where no constructor is necessary to create `is`
relations.
Regards
On Sun, Aug 24, 2014 at 10:15 PM, C. Scott Ananian ecmascr...@cscott.net
wrote:
On Sun, Aug 24, 2014 at 4:04 PM, Isiah Meadows
Cc the list...
On Aug 25, 2014 6:06 PM, Isiah Meadows impinb...@gmail.com wrote:
There really shouldn't be any sort of object construction needed to check
types like this. `isa` may be better, anyways, but I still find that
requirement to build and destroy an object to check somewhat
Isiah Meadows wrote:
Cc the list...
On Aug 25, 2014 6:06 PM, Isiah Meadows impinb...@gmail.com
mailto:impinb...@gmail.com wrote:
There really shouldn't be any sort of object construction needed
to check types like this. `isa` may be better, anyways, but I
still find that
There is no way currently to reliably verify types in JS. Type annotations
cannot solve this completely, especially when you have an overloaded
function. A way to reliably verify types would make this far easier. So
far, here are the current options with their respective caveats:
1. `instanceof`
On Sun, Aug 24, 2014 at 4:04 PM, Isiah Meadows impinb...@gmail.com wrote:
There is no way currently to reliably verify types in JS. Type annotations
cannot solve this completely, especially when you have an overloaded
function. A way to reliably verify types would make this far easier. So far,
On Sun, 24 Aug 2014, Isiah Meadows wrote:
One big question I have is whether a different keyword should be used
(`isa`, etc), given its use as a keyword synonym to `===` in many
compile-to-JS languages, most notably CoffeeScript.
is is used to mean is an instance of or an instance of a
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