On May 31, 2012, at 2:40 PM, Mark S. Miller wrote:
> I think there's a core confusion at the heart of this thread. Let's restart
> operationally.
>
> If one did have such a predicate, when would some other program actually use
> it? In other words, for the predicate you have in mind, please give a
> concrete example where a program would usefully say
>
> if (isBoundOrWhateverWeCallIt(f)) {
> //... do something
> } else {
> //... do something else
> }
>
> If the predicate means what I think it should mean, I can offer some examples
> of when I would do this. If the predicate means anything else that's been
> advocated on this thread, such as "fat arrow or bound", then I have no idea
> why anyone would ever write code as above. Can anyone offer a concrete
> example? If not, then I suggest that these other proposed meanings are simply
> not useful.
For example, somebody might want to replace the existing apply, call, and bind
methods, with versions that throw an error when invoked on a fat arrow or bound
function. For example:
(function replaceCall() {
if (Function.prototype.hasOwnProperty("intrinsicCall")) return;
Object.defineProperty(Function.prototype,"intrinsicCall", {value:
Function.prototype.call, configurable:true});
Function.prototype.call = function(...args) {
if (this.isBound()) throw new TypeError("Using call method with a bound
function");
else return this.intrinsicCall(...args);
};
})();
This would seem useful for testing to see if any "bound functions" are being
used in situations that may be trying to explicitly provide a this value.
Allen
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