Hi Till,
I believe Boris Zbarski touched on this recently at
http://lists.w3.org/Archives/Public/public-script-coord/2013AprJun/0428.html
(I haven't read the full thread, so can't tell what the conclusion were,
but it's probably worth checking out)
David
Le 31/05/2013 04:33, Till Schneidereit a écrit :
I couldn't find any precise definition for the spec term "present", so
this is not entirely clear to me.
Example:
In step 7 of 15.4.3.21 Array.prototype.reduce, a TypeError must be
thrown if the optional argument `initialValue` isn't present. If a
value of `undefined` does *not* cause the argument to be present, that
function can be implemented with the following signature:
`function ArrayReduce(callbackfn, initialValue = undefined)`
If, however, the value `undefined` means that the argument is present,
the signature should probably be:
`function ArrayReduce(callbackfn, ...rest)`
The question isn't entirely academic, as I'm trying to get the
self-hosted implementations of builtins in SpiderMonkey to be as close
to the spec as possible.
thanks,
till
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