>> Or are there other plans to get it solved? I would still love to see that
>> happen, it’s a remarkably subtle source of errors. Could functions adopt the
>> block-lambda semantics of picking up the `this` of the surrounding scope
>> when not invoked as methods? It seems like that could work in strict mode
>> where no one expects `this` to have a value.
>
> No, if you call such functions via object.method() references then this binds
> to object. You can't break such compatibility only at runtime, and only some
> of the time.
Got it. I’m assuming that’s a performance issue?
In principle, one can envision: Bind this lexically by default, override with
receiver when called as a function.
var obj1 = {
makeFunction: function() {
return function () { return this; };
}
}
var func = obj1. makeFunction();
console.log(func() === obj1); // true, lexical `this` by default
obj2 = {
method: func
}
console.log(obj2.method() === obj2); // true, dynamic this overrides lexical
`this`
Sorry for bringing up this issue again, I’m still a bit hazy as to what the
arguments against such a solution are, especially after having seen the
semantics of block lambdas.
--
Dr. Axel Rauschmayer
a...@rauschma.de
home: rauschma.de
twitter: twitter.com/rauschma
blog: 2ality.com
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