Angus Croll wrote:
On Apr 29, 2012, at 1:28, Brendan Eich<[email protected]> wrote:
Axel Rauschmayer wrote:
I am not saying that the transition from the old rules to the new rules will be
entirely painless, but if the new rules are simple, that pain is worth it, IMHO.
There are no new rules. Some functions ignore |this| or bind it rather than
using it. These differences in kind do not change due to arrows.
Is there lexical |this| binding in ES5?
The only relevant issue for my exchange with Axel was whether any kind
of this-binding exists in ES5 or older. The answer is yes.
"Lexical this" is often wanted and of course simulated with var self =
this; ... function (){...self...} or .bind (implementable in pure ES3).
But the lexical part doesn't enter into the contract of the API taking
the function argument. It's between the API caller and the function
argument's implementation -- when the latter is a closure in the former,
lexical |this| often wins.
/be
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