Array.splice({} )
What should it do?
I think it should return a new Array with length 0.
Array.splice(ar r, start, deleteCount [, item1 [, item2[,...]]]) http://bclary.com/2004/11/07/#a-15.4.4.12
Example:
Array.splice({} )
Result:
FF3.1
function splice() { [native code] }
Webkit:
undefined
If - start - is passed in, a 0 length array is returned.
Array.prototype .splice.call(0, undefined);
Result: []
The methods that go into calculating the - length - property all call
ToNumber, either through ToUint32, or ToInteger. ToNumber coverts
undefined to NaN, which returns the value back to its caller, either
ToInteger or ToUint32, which converts NaN to +0.
It seems step 4 is not what I expect:
| 4. Call ToInteger(start ).
start is omitted from the argument list, I assume this means start =
undefined.
ToInteger calls ToNumber.
ToInteger:
| 1. Call ToNumber on the input argument.
| 2. If Result(1) is NaN, return +0.
....
ToNumber returns NaN:
| 9.3 ToNumber
| The operator ToNumber converts its argument
| to a value of type Number according to the following table:
|-----------+-----+
| Undefined | NaN |
`....-------+-----+
Back to ToInteger, step 2.
| 2. If Result(1) is NaN, return +0. 18  1824 
dhtml wrote:
That would be:
javascript:aler t(Array.prototy pe.isPrototypeO f(
Array.prototype .splice.call({} ) ))
Results:
Opera9.5 mac:
true
FF3.1, Webkit
false
Garrett
On 19 Aug., 07:59, dhtml <dhtmlkitc...@g mail.comwrote:
Array.splice({} )
What should it do?
I think it should return a new Array with length 0.
Array.splice(ar r, start, deleteCount [, item1 [, item2[,...]]])http://bclary.com/2004/11/07/#a-15.4.4.12
I'm only an occasional poster and not expert, but am I falling for a
troll here?
Array.splice({} ) makes semantically absolutely no sense.
a) Splice is the method of an array object, not of the Array global
object.
b) "{}" is an empty object not an "array of the length 0".
So I guess you accually mean [].splice()
However
c) the start and deleteCount parameters are mandatory, so who cares
what the different engines return in such an undefined case?
Robin
On Aug 19, 2:40 pm, Robin Rattay wrote:
On 19 Aug., 07:59, dhtml wrote:
>Array.splice({ })
>What should it do?
>I think it should return a new Array with length 0.
>Array.splice(a rr, start, deleteCount [, item1 [, item2[,...]]])
http://bclary.com/2004/11/07/#a-15.4.4.12
I'm only an occasional poster and not expert, but am
I falling for a troll here?
It would have been easier to tell if the OP had actually made some
(any) point.
Array.splice({} ) makes semantically absolutely no sense.
a) Splice is the method of an array object, not of the
Array global object.
That may just be a misguided use of "Array" to mean any array object.
There are certainly many less ambiguous ways to express that, if it
was the intention.
b) "{}" is an empty object not an "array of the length 0".
So I guess you accually mean [].splice()
More likely - [].slice({}) - else there would have been no point in
mentioning the handling of objects in ToInteger (which without a
modification to Object.prototyp e.toString/valueOf will return numeric
zero).
However
c) the start and deleteCount parameters are mandatory,
No they are not (at least in the sense that omitting them form the
method call will not result in an error and will have a predictable/
specified outcome).
so who cares what the different engines return in such
an undefined case?
If the outcome does not correspond with the specified outcome in any
given implementation then those implementers might care.
Henry wrote:
On Aug 19, 2:40 pm, Robin Rattay wrote:
>On 19 Aug., 07:59, dhtml wrote:
>>Array.splice( {})
What should it do?
I think it should return a new Array with length 0.
Array.splice( arr, start, deleteCount [, item1 [, item2[,...]]])
http://bclary.com/2004/11/07/#a-15.4.4.12
I'm only an occasional poster and not expert, but am
I falling for a troll here?
No, you're trying to answer a question you don't have an answer to and
being mildly insulting in the process. What makes you think I'm a troll?
It would have been easier to tell if the OP had actually made some
(any) point.
Ah, but I asked a question.
>
>Array.splice({ }) makes semantically absolutely no sense.
a) Splice is the method of an array object, not of the
Array global object.
Right, Array.splice is the generic top-level method (and 'Henry' is
likely aware). But that's why I followed up with the
Array.prototype .splice.call sample, which is standard and implemented in
more browsers.
That may just be a misguided use of "Array" to mean any array object.
Nope, just the code I was running in Firefox.
>
>b) "{}" is an empty object not an "array of the length 0".
So I guess you accually mean [].splice()
More likely - [].slice({}) -
No, I meat exactly what I wrote, and if you'd tried it, you might have
noticed that Array.splice({} ) in Firefox, returns the splice function
itself like I wrote. Did you try it?
>However
c) the start and deleteCount parameters are mandatory,
No they are not (at least in the sense that omitting them form the
method call will not result in an error and will have a predictable/
specified outcome).
>so who cares what the different engines return in such
an undefined case?
If the outcome does not correspond with the specified outcome in any
given implementation then those implementers might care.
The question is: "What is the specified output when 'start' is absent?"
Its a somewhat obscure question. I think it should be the array created
in step 1. Webkit and Firefox give different results.
Related thread: http://groups.google.com/group/comp....8?dmode=source
Regarding step 4 of Array.prototype .splice, if the 'start' argument is
not present, it should be assumed to be undefined, right? This lead
through several more steps, which should result in step 54 returning A.
Garrett
On Aug 19, 6:50 pm, dhtml wrote:
Henry wrote:
>On Aug 19, 2:40 pm, Robin Rattay wrote:
>>On 19 Aug., 07:59, dhtml wrote:
Array.splice ({})
What should it do?
It would have been easier to tell if the OP had actually
made some
(any) point.
Ah, but I asked a question.
If you mean your question was "what should a non-standard language
extension that only exists in a few of implementations do?" then the
answer is "anything it likes, and not necessarily the same thing as
any other non-standard extension that resembles it".
>>Array.splice( {}) makes semantically absolutely no sense.
>>a) Splice is the method of an array object, not of the
Array global object.
Right, Array.splice is the generic top-level method
There is no "the" about it. If there is an - Array.splice - at all
then it is a non-standard language extension.
(and 'Henry' is
likely aware). But that's why I followed up with the
Array.prototype .splice.call sample, which is standard
and implemented in more browsers.
Is it? I did wonder what the point of that follow up was, particularly
as you switched from using an array literal as the argument to splice
to not providing any arguments at all.
>That may just be a misguided use of "Array" to mean any
array object.
Nope, just the code I was running in Firefox.
So it was actually a pointless question; it is generally not viable to
use non-standard language extensions in non-known environment contexts
(as they are unlikely to be either universally or consistently
implemented) and if you have a know environment you can determine the
answer for that context on your own.
>>b) "{}" is an empty object not an "array of the length 0".
>>So I guess you accually mean [].splice()
>More likely - [].slice({}) -
No, I meat exactly what I wrote, and if you'd tried it, you
might have noticed that Array.splice({} ) in Firefox, returns
the splice function itself like I wrote.
You did not write that.
Did you try it?
No, why should I as you made no relevant point?
<snip>
The question is: "What is the specified output when 'start'
is absent?"
<snip>
With - Array.prototype .slice -, an empty array.
With - Array.slice -, ask the people who wrote it.
Henry wrote:
On Aug 19, 6:50 pm, dhtml wrote:
>Henry wrote:
>>On Aug 19, 2:40 pm, Robin Rattay wrote:
On 19 Aug., 07:59, dhtml wrote:
[snip]
>>>b) "{}" is an empty object not an "array of the length 0".
So I guess you accually mean [].splice()
More likely - [].slice({}) -
No, I meat exactly what I wrote, and if you'd tried it, you
might have noticed that Array.splice({} ) in Firefox, returns
the splice function itself like I wrote.
You did not write that.
Anyone can read that first post:
| Example:
| Array.splice({} )
|
|Result:
| FF3.1
| function splice() { [native code] }
|
Firefox 3.1 returning the splice function itself.
The funny thing is, is that if -undefined- is passed in, it works as
expected in Firefox.
javascript :var ap = Array.prototype ;
alert(ap.isProt otypeOf(ap.spli ce.call({})));
FF3.1, Webkit: false
Opera: true
javascript :aler t(ap.isPrototyp eOf(ap.splice.c all({}, undefined)));
FF3.1, Webkit: true
Opera: true
I think Opera is getting this right. I've read through the steps of the
algorithm an the Array created in step 1 should be returned in step 54.
If I'm not mistaken, that's the only Return.
Garrett
dhtml wrote:
Henry wrote:
>On Aug 19, 6:50 pm, dhtml wrote:
>>Henry wrote:
On Aug 19, 2:40 pm, Robin Rattay wrote:
On 19 Aug., 07:59, dhtml wrote:
[snip]
>>>>b) "{}" is an empty object not an "array of the length 0".
So I guess you accually mean [].splice()
More likely - [].slice({}) -
No, I meat exactly what I wrote, and if you'd tried it, you
might have noticed that Array.splice({} ) in Firefox, returns
the splice function itself like I wrote.
You did not write that.
Anyone can read that first post:
| Example:
| Array.splice({} )
|
|Result:
| FF3.1
| function splice() { [native code] }
|
Firefox 3.1 returning the splice function itself.
Firefox 3.1 is already released? Time flies ...
The funny thing is, is that if -undefined- is passed in, it works as
expected in Firefox.
javascript:var ap = Array.prototype ;
alert(ap.isProt otypeOf(ap.spli ce.call({})));
FF3.1, Webkit: false
Opera: true
javascript:aler t(ap.isPrototyp eOf(ap.splice.c all({}, undefined)));
FF3.1, Webkit: true
Opera: true
I think Opera is getting this right. I've read through the steps of the
algorithm an the Array created in step 1 should be returned in step 54.
If I'm not mistaken, that's the only Return.
You don't get it, do you? The language standard makes the first two
arguments of the method *mandatory*, so if an implementation does not error
out if one or both are missing, there is no telling if the return value is
the right or wrong one because there is nothing to base that assessment on.
And Array.splice() is certainly not the same as Array.prototype .splice().
PointedEars
--
Use any version of Microsoft Frontpage to create your site.
(This won't prevent people from viewing your source, but no one
will want to steal it.)
-- from <http://www.vortex-webdesign.com/help/hidesource.htm>
Thomas 'PointedEars' Lahn wrote:
dhtml wrote:
>Henry wrote:
>>On Aug 19, 6:50 pm, dhtml wrote:
Henry wrote:
On Aug 19, 2:40 pm, Robin Rattay wrote:
>On 19 Aug., 07:59, dhtml wrote:
You don't get it, do you? The language standard makes the first two
arguments of the method *mandatory*,
Apparently I missed the line in the spec that says 'The first two
arguments are necessary.'
About the closest I can get to supporting your claim is:
| When the splice method is called with
| two or more arguments start...
| The following steps are taken:
Which could mean that: The algorithm applies under the conditions of
both -start- and -deleteCount- being present. Or, the sentences could be
taken separately.
The wording isn't clear.
so if an implementation does not error
out if one or both are missing, there is no telling if the return value is
the right or wrong one because there is nothing to base that assessment on.
There's the algorithm for splice. Did you read it?
And Array.splice() is certainly not the same as Array.prototype .splice().
It's actually the same code in the engine, but that's really beside the
point.
Please try to keep this thread focused and not destroy it.
Garrett
>
PointedEars
dhtml wrote:
Thomas 'PointedEars' Lahn wrote:
>You don't get it, do you? The language standard makes the first two
arguments of the method *mandatory*,
Apparently I missed the line in the spec that says 'The first two
arguments are necessary.' [...]
*Obviously*.
| 15.4.4.12 Array.prototype .splice (start, deleteCount [ , item1 [ , item2 [
| , … ] ] ] )
Brackets usually mark optional arguments/parameters, and they do so there.
PointedEars
--
Use any version of Microsoft Frontpage to create your site.
(This won't prevent people from viewing your source, but no one
will want to steal it.)
-- from <http://www.vortex-webdesign.com/help/hidesource.htm> This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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