> 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? -- David "liorean" Andersson _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
