On 8/12/14, 12:44 PM, Garrett Smith wrote:
If the typeof OBJECT results "function" then it either: a) implements [[Call]]
That's exactly what it does. This allows making plug-in objects callable if the plug-in decides to do so.
Since calling `Function.prototype.toString` with OBJECT as the this value results in a TypeError, it appears that the OBJECT does not implement [[Call]]
Nope. It definitely implements [[Cal]]; I can point you to the part of the code where that's done if you care.
The issue you're seeing is that in SpiderMonkey Function.prototype.toString will throw if its 'this' value is not a Function object (as defined based on internal [[Class]] like checks, not based on [[Call]]; in particular note that Object.prototype.toString does _not_ return "Function" for an <object> in SpiderMonkey). So it throws for various callables that aren't actually functions.
-Boris _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
