On 05/26/2009 06:05 PM, Mark S. Miller wrote:
JavaScript has one and only one encapsulation mechanism -- functions
evaluating to closures that encapsulate their captured variables.
However, the existence of these de-facto properties pokes a fatal hole
in this mechanism, leaving us with no defensible boundary.
I appreciated the example on the slide you linked to. Providing .caller
does seem to be problematic.
However, what you wrote above confused me. The things encapsulated by a
closure are the variables it refers to from lexically enclosing scopes.
What you wrote suggests that .caller somehow makes those available to
others, which isn't so, as far as I can tell. The closure's arguments
can be obtained, but those are different.
The mechanism with the hole is the dynamic link, not the static link.
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