liorean wrote: >> On Tue, May 5, 2009 at 11:37 AM, Peter Michaux <[email protected]> >> wrote: >>> function(a=1, b="defaultVal"); >>> >>> And in this syntax will default values be used if the parameter is >>> falsey or only if it is undefined? > > 2009/5/5 Mark S. Miller <[email protected]>: >> Or only if it is absent? > > I've been out of the ECMAScript world for many months now, but IIRC in > ES3 all formal parameters that are absent gets initiated to the value > undefined. Not sure which side of the function call border that > initiation takes place on, though. Wouldn't special casing absence > from undefined value effectively introduce another state for a > variable to be in, though, since the behaviour is indistinguishable in > user code in ES3?
It's not indistinguishable; exactly the first arguments.length parameters are present, regardless of whether they are undefined. -- David-Sarah Hopwood ⚥ _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
