On Wed, Oct 10, 2012 at 7:15 PM, Brendan Eich <brendan@mozilla.org> wrote: > Boris Zbarsky wrote: >> >> Should "undefined", when provided for a dictionary entry, also be treated >> as "not present"? That is, should passing a dictionary like so: >> >> { a: undefined } >> >> be equivalent to passing a dictionary that does not contain "a" at all? > > ES6 says no. That's a bridge too far. Parameter lists are not objects! I thought the idea was that for something like: function f({ a = 42 }) { console.log(a); } obj = {}; f({ a: obj.prop }); that that would log 42. What is the reason for making this different from: function f(a = 42) { console.log(a); } obj = {}; f(obj.prop); It seems to me that the same "it'll do the right thing in all practical contexts" argument applied equally to both cases? I might very well be missing something though? / JonasReceived on Thursday, 11 October 2012 05:57:59 UTC
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