Rails spinoffs - Nov 2007 - [javascript] general question, function parameters | [json] dates

Hey Guys

Does anyone know if I have an array if I can pass that array to a function,
*as* the parameters.. not pass it as a parameter, but effectively have my
scoped array become function.arguments.
I have a regular expression that splits an ISO date string that''s given
me a
match array, which I then split to drop the first match (the whole string)
leaving me with year,month,day,hour,min,sec and I want to pass that to new
Date()
I could go var d = new Date(ma[0],ma[1],ma[2]... but I figure if I can do
the arguments thing then its a technique i could adopt elsewhere.
I control both sides of the interface, the source as well as the processing
so I know the format will always be the same.
(incidentally, the date comes from a .net date originally, and I use a
.tostring("s") to get the iso format, which is passed to json as a
string -
there may be a better way for that)

Hope this makes sense,

Gareth

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You want Function#apply.

see
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Function:apply

Best,
Thomas

Am 29.11.2007 um 07:39 schrieb Gareth Evans:
> Hey Guys
>
> Does anyone know if I have an array if I can pass that array to a  
> function, *as* the parameters.. not pass it as a parameter, but  
> effectively have my scoped array become function.arguments.
> I have a regular expression that splits an ISO date string that''s
> given me a match array, which I then split to drop the first match  
> (the whole string) leaving me with year,month,day,hour,min,sec and I  
> want to pass that to new Date()
> I could go var d = new Date(ma[0],ma[1],ma[2]... but I figure if I  
> can do the arguments thing then its a technique i could adopt  
> elsewhere.
> I control both sides of the interface, the source as well as the  
> processing so I know the format will always be the same.
> (incidentally, the date comes from a .net date originally, and I use  
> a .tostring("s") to get the iso format, which is passed to json
as a
> string - there may be a better way for that)
>
> Hope this makes sense,
>
> Gareth
>
> >

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Thanks Thomas, I thought it was used in prototype but a lot of the argument
stuff I don''t follow. It was quicker to ask :)

Gareth

On Nov 29, 2007 9:21 PM, Thomas Fuchs
<thomas-9D208sng4xU@public.gmane.org> wrote:
>
> You want Function#apply.
>
> see
>
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Function:apply
>
> Best,
> Thomas
>
> Am 29.11.2007 um 07:39 schrieb Gareth Evans:
>
> > Hey Guys
> >
> > Does anyone know if I have an array if I can pass that array to a
> > function, *as* the parameters.. not pass it as a parameter, but
> > effectively have my scoped array become function.arguments.
> > I have a regular expression that splits an ISO date string
that''s
> > given me a match array, which I then split to drop the first match
> > (the whole string) leaving me with year,month,day,hour,min,sec and I
> > want to pass that to new Date()
> > I could go var d = new Date(ma[0],ma[1],ma[2]... but I figure if I
> > can do the arguments thing then its a technique i could adopt
> > elsewhere.
> > I control both sides of the interface, the source as well as the
> > processing so I know the format will always be the same.
> > (incidentally, the date comes from a .net date originally, and I use
> > a .tostring("s") to get the iso format, which is passed to
json as a
> > string - there may be a better way for that)
> >
> > Hope this makes sense,
> >
> > Gareth
> >
> > >
>
>
> >
>
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Slacker! I guess others will profit as well from this info. But don''t  
you become a Help Vampire[1]. ;)

- Thomas
[1] http://www.slash7.com/articles/2006/12/22/vampires

Am 29.11.2007 um 09:22 schrieb Gareth Evans:
> Thanks Thomas, I thought it was used in prototype but a lot of the  
> argument stuff I don''t follow. It was quicker to ask :)
>
> Gareth
>
> On Nov 29, 2007 9:21 PM, Thomas Fuchs <
thomas-9D208sng4xU@public.gmane.org> wrote:
>
> You want Function#apply.
>
> see
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Function:apply
>
> Best,
> Thomas
>
> Am 29.11.2007 um 07:39 schrieb Gareth Evans:
>
> > Hey Guys
> >
> > Does anyone know if I have an array if I can pass that array to a
> > function, *as* the parameters.. not pass it as a parameter, but
> > effectively have my scoped array become function.arguments .
> > I have a regular expression that splits an ISO date string
that''s
> > given me a match array, which I then split to drop the first match
> > (the whole string) leaving me with year,month,day,hour,min,sec and I
> > want to pass that to new Date()
> > I could go var d = new Date(ma[0],ma[1],ma[2]... but I figure if I
> > can do the arguments thing then its a technique i could adopt
> > elsewhere.
> > I control both sides of the interface, the source as well as the
> > processing so I know the format will always be the same.
> > (incidentally, the date comes from a .net date originally, and I use
> > a .tostring("s") to get the iso format, which is passed to
json as a
> > string - there may be a better way for that)
> >
> > Hope this makes sense,
> >
> > Gareth
> >
> > >
>
>
>
> >

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Well, I tried google and it was proving to be difficult cos all I turned up
was articles on passing arrays to functions.. and I was pretty sure it was
done in prototype so I figured it was a good place to ask.

I like that term, help vampire :)

I was trying to apply on the Date constructor though, and the parser didnt
seem to like me (the script just stopped executing on that line), so I will
play around a bit more and see if I did something dumb or if I need to add
an extra set of brackets or something..
It''s quite good to have a mailing list such as this which the
occasional
idea can be bounced off other members...

I know it''s mostly prototype related but I have noticed an upturn in
overall
questions recently..

Google is usually my first port of call anyway, followed by asking people :)

Gareth

On 11/29/07, Thomas Fuchs <thomas-9D208sng4xU@public.gmane.org> wrote:
>
> Slacker! I guess others will profit as well from this info. But
don''t
> you become a Help Vampire[1]. ;)
>
> - Thomas
> [1] http://www.slash7.com/articles/2006/12/22/vampires
>
> Am 29.11.2007 um 09:22 schrieb Gareth Evans:
>
> > Thanks Thomas, I thought it was used in prototype but a lot of the
> > argument stuff I don''t follow. It was quicker to ask :)
> >
> > Gareth
> >
> > On Nov 29, 2007 9:21 PM, Thomas Fuchs <
thomas-9D208sng4xU@public.gmane.org> wrote:
> >
> > You want Function#apply.
> >
> > see
>
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Function:apply
> >
> > Best,
> > Thomas
> >
> > Am 29.11.2007 um 07:39 schrieb Gareth Evans:
> >
> > > Hey Guys
> > >
> > > Does anyone know if I have an array if I can pass that array to a
> > > function, *as* the parameters.. not pass it as a parameter, but
> > > effectively have my scoped array become function.arguments .
> > > I have a regular expression that splits an ISO date string
that''s
> > > given me a match array, which I then split to drop the first
match
> > > (the whole string) leaving me with year,month,day,hour,min,sec
and I
> > > want to pass that to new Date()
> > > I could go var d = new Date(ma[0],ma[1],ma[2]... but I figure if
I
> > > can do the arguments thing then its a technique i could adopt
> > > elsewhere.
> > > I control both sides of the interface, the source as well as the
> > > processing so I know the format will always be the same.
> > > (incidentally, the date comes from a .net date originally, and I
use
> > > a .tostring("s") to get the iso format, which is passed
to json as a
> > > string - there may be a better way for that)
> > >
> > > Hope this makes sense,
> > >
> > > Gareth
> > >
> > > >
> >
> >
> >
> > >
>
>
> >
>
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Unfortunately, JavaScript doesn''t let you use apply on constructors.

You''re out of luck on that one.

Best,

Tobie



On Nov 29, 11:20 am, "Gareth Evans"
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Well, I tried google and it was proving to be difficult cos all I turned up
> was articles on passing arrays to functions.. and I was pretty sure it was
> done in prototype so I figured it was a good place to ask.
>
> I like that term, help vampire :)
>
> I was trying to apply on the Date constructor though, and the parser didnt
> seem to like me (the script just stopped executing on that line), so I will
> play around a bit more and see if I did something dumb or if I need to add
> an extra set of brackets or something..
> It''s quite good to have a mailing list such as this which the
occasional
> idea can be bounced off other members...
>
> I know it''s mostly prototype related but I have noticed an upturn
in overall
> questions recently..
>
> Google is usually my first port of call anyway, followed by asking people
:)
>
> Gareth
>
> On 11/29/07, Thomas Fuchs <tho...-9D208sng4xU@public.gmane.org>
wrote:
>
>
>
> > Slacker! I guess others will profit as well from this info. But
don''t
> > you become a Help Vampire[1]. ;)
>
> > - Thomas
> > [1]http://www.slash7.com/articles/2006/12/22/vampires
>
> > Am 29.11.2007 um 09:22 schrieb Gareth Evans:
>
> > > Thanks Thomas, I thought it was used in prototype but a lot of
the
> > > argument stuff I don''t follow. It was quicker to ask :)
>
> > > Gareth
>
> > > On Nov 29, 2007 9:21 PM, Thomas Fuchs <
tho...-9D208sng4xU@public.gmane.org> wrote:
>
> > > You want Function#apply.
>
> > > see
>
>http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Gl...
>
> > > Best,
> > > Thomas
>
> > > Am 29.11.2007 um 07:39 schrieb Gareth Evans:
>
> > > > Hey Guys
>
> > > > Does anyone know if I have an array if I can pass that array
to a
> > > > function, *as* the parameters.. not pass it as a parameter,
but
> > > > effectively have my scoped array become function.arguments .
> > > > I have a regular expression that splits an ISO date string
that''s
> > > > given me a match array, which I then split to drop the first
match
> > > > (the whole string) leaving me with
year,month,day,hour,min,sec and I
> > > > want to pass that to new Date()
> > > > I could go var d = new Date(ma[0],ma[1],ma[2]... but I
figure if I
> > > > can do the arguments thing then its a technique i could
adopt
> > > > elsewhere.
> > > > I control both sides of the interface, the source as well as
the
> > > > processing so I know the format will always be the same.
> > > > (incidentally, the date comes from a .net date originally,
and I use
> > > > a .tostring("s") to get the iso format, which is
passed to json as a
> > > > string - there may be a better way for that)
>
> > > > Hope this makes sense,
>
> > > > Gareth
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On Thu, Nov 29, 2007 at 04:00:26AM -0800, Tobie Langel
wrote:
> Unfortunately, JavaScript doesn''t let you use apply on
constructors.
> You''re out of luck on that one.
Correction: JavaScript doesn''t let you use apply on constructors
*easily*.

var MyClass = Class.create({
  initialize: function(num1, num2, num3) { /* do stuff */ }
  });

var myargs = [ 1, 2, 3 ];
var foo = {};
foo.__proto__ = MyClass.prototype;
MyClass.apply(foo, myargs);

Note that the order of those last two lines is very important. I think that
with Prototype classes (i.e. those created with Class.create), you can sort
of skip a step:

var foo = {};
foo.__proto__ = MyClass.prototype;
foo.initialize.apply(foo, myargs);

Note that this is based on slides from Dan Webb and that I have not
actually tested it.

I might argue that the function returned by Class.create() should not only
call initialize but should first set this.__proto__ to
arguments.callee.prototype, making this sort of thing even simpler. Does
this sound appealing to anyone? It''s a one-line patch.
> Best,
> Tobie
--Greg
> On Nov 29, 11:20 am, "Gareth Evans"
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Well, I tried google and it was proving to be difficult cos all I
turned up
> > was articles on passing arrays to functions.. and I was pretty sure it
was
> > done in prototype so I figured it was a good place to ask.
> >
> > I like that term, help vampire :)
> >
> > I was trying to apply on the Date constructor though, and the parser
didnt
> > seem to like me (the script just stopped executing on that line), so I
will
> > play around a bit more and see if I did something dumb or if I need to
add
> > an extra set of brackets or something..
> > It''s quite good to have a mailing list such as this which the
occasional
> > idea can be bounced off other members...
> >
> > I know it''s mostly prototype related but I have noticed an
upturn in overall
> > questions recently..
> >
> > Google is usually my first port of call anyway, followed by asking
people :)
> >
> > Gareth
> >
> > On 11/29/07, Thomas Fuchs <tho...-9D208sng4xU@public.gmane.org>
wrote:
> >
> >
> >
> > > Slacker! I guess others will profit as well from this info. But
don''t
> > > you become a Help Vampire[1]. ;)
> >
> > > - Thomas
> > > [1]http://www.slash7.com/articles/2006/12/22/vampires
> >
> > > Am 29.11.2007 um 09:22 schrieb Gareth Evans:
> >
> > > > Thanks Thomas, I thought it was used in prototype but a lot
of the
> > > > argument stuff I don''t follow. It was quicker to
ask :)
> >
> > > > Gareth
> >
> > > > On Nov 29, 2007 9:21 PM, Thomas Fuchs <
tho...-9D208sng4xU@public.gmane.org> wrote:
> >
> > > > You want Function#apply.
> >
> > > > see
> >
>http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Gl...
> >
> > > > Best,
> > > > Thomas
> >
> > > > Am 29.11.2007 um 07:39 schrieb Gareth Evans:
> >
> > > > > Hey Guys
> >
> > > > > Does anyone know if I have an array if I can pass that
array to a
> > > > > function, *as* the parameters.. not pass it as a
parameter, but
> > > > > effectively have my scoped array become
function.arguments .
> > > > > I have a regular expression that splits an ISO date
string that''s
> > > > > given me a match array, which I then split to drop the
first match
> > > > > (the whole string) leaving me with
year,month,day,hour,min,sec and I
> > > > > want to pass that to new Date()
> > > > > I could go var d = new Date(ma[0],ma[1],ma[2]... but I
figure if I
> > > > > can do the arguments thing then its a technique i could
adopt
> > > > > elsewhere.
> > > > > I control both sides of the interface, the source as
well as the
> > > > > processing so I know the format will always be the
same.
> > > > > (incidentally, the date comes from a .net date
originally, and I use
> > > > > a .tostring("s") to get the iso format, which
is passed to json as a
> > > > > string - there may be a better way for that)
> >
> > > > > Hope this makes sense,
> >
> > > > > Gareth
> > 
> 
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Thomas, Well, even if the knowledge I was seeking to clean my code up
isn''t
possible in the language, at least now I know how it works.
I''ve researched apply and call following your prompt and I think I
finally
understand how some of the ''this'' magic in prototype works.
I''ve looked at the argument stuff previously and never had the time to
deconstruct it and actually understand it - I couldn''t see how bind
actually
did it''s magic.
I really appreciate your help, even if it was leaning towards vampire
teritory.

Gregory, the specific constructor I wanted to use apply on was a date
object.
I have an array with [year,month,day,hour,min,sec] and wanted to create a
date object from it.
an example is
var d = new Date(2007,09,09,12,36,34);

I wanted to replace the numbers with my 6 element array.. I''m aware I
can go
ar[0],ar[1] etc but that''s not as elegant so I was looking to improve
the
syntax.

Gareth

On 11/30/07, Gregory Seidman
<gsslist+prototype-dNXPQ6k9rNiG6BJUYyje5axOck334EZe@public.gmane.org>
wrote:
>
>
> On Thu, Nov 29, 2007 at 04:00:26AM -0800, Tobie Langel wrote:
> > Unfortunately, JavaScript doesn''t let you use apply on
constructors.
> > You''re out of luck on that one.
>
> Correction: JavaScript doesn''t let you use apply on constructors
*easily*.
>
> var MyClass = Class.create({
> initialize: function(num1, num2, num3) { /* do stuff */ }
> });
>
> var myargs = [ 1, 2, 3 ];
> var foo = {};
> foo.__proto__ = MyClass.prototype;
> MyClass.apply(foo, myargs);
>
> Note that the order of those last two lines is very important. I think
> that
> with Prototype classes (i.e. those created with Class.create), you can
> sort
> of skip a step:
>
> var foo = {};
> foo.__proto__ = MyClass.prototype;
> foo.initialize.apply(foo, myargs);
>
> Note that this is based on slides from Dan Webb and that I have not
> actually tested it.
>
> I might argue that the function returned by Class.create() should not only
> call initialize but should first set this.__proto__ to
> arguments.callee.prototype, making this sort of thing even simpler. Does
> this sound appealing to anyone? It''s a one-line patch.
>
> > Best,
> > Tobie
> --Greg
>
> > On Nov 29, 11:20 am, "Gareth Evans"
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > Well, I tried google and it was proving to be difficult cos all I
> turned up
> > > was articles on passing arrays to functions.. and I was pretty
sure it
> was
> > > done in prototype so I figured it was a good place to ask.
> > >
> > > I like that term, help vampire :)
> > >
> > > I was trying to apply on the Date constructor though, and the
parser
> didnt
> > > seem to like me (the script just stopped executing on that line),
so I
> will
> > > play around a bit more and see if I did something dumb or if I
need to
> add
> > > an extra set of brackets or something..
> > > It''s quite good to have a mailing list such as this
which the
> occasional
> > > idea can be bounced off other members...
> > >
> > > I know it''s mostly prototype related but I have noticed
an upturn in
> overall
> > > questions recently..
> > >
> > > Google is usually my first port of call anyway, followed by
asking
> people :)
> > >
> > > Gareth
> > >
> > > On 11/29/07, Thomas Fuchs
<tho...-9D208sng4xU@public.gmane.org> wrote:
> > >
> > >
> > >
> > > > Slacker! I guess others will profit as well from this info.
But
> don''t
> > > > you become a Help Vampire[1]. ;)
> > >
> > > > - Thomas
> > > > [1]http://www.slash7.com/articles/2006/12/22/vampires
> > >
> > > > Am 29.11.2007 um 09:22 schrieb Gareth Evans:
> > >
> > > > > Thanks Thomas, I thought it was used in prototype but a
lot of the
> > > > > argument stuff I don''t follow. It was quicker
to ask :)
> > >
> > > > > Gareth
> > >
> > > > > On Nov 29, 2007 9:21 PM, Thomas Fuchs <
tho...-9D208sng4xU@public.gmane.org> wrote:
> > >
> > > > > You want Function#apply.
> > >
> > > > > see
> > > >
> http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Gl...
> > >
> > > > > Best,
> > > > > Thomas
> > >
> > > > > Am 29.11.2007 um 07:39 schrieb Gareth Evans:
> > >
> > > > > > Hey Guys
> > >
> > > > > > Does anyone know if I have an array if I can pass
that array to
> a
> > > > > > function, *as* the parameters.. not pass it as a
parameter, but
> > > > > > effectively have my scoped array become
function.arguments .
> > > > > > I have a regular expression that splits an ISO
date string
> that''s
> > > > > > given me a match array, which I then split to drop
the first
> match
> > > > > > (the whole string) leaving me with
year,month,day,hour,min,sec
> and I
> > > > > > want to pass that to new Date()
> > > > > > I could go var d = new Date(ma[0],ma[1],ma[2]...
but I figure if
> I
> > > > > > can do the arguments thing then its a technique i
could adopt
> > > > > > elsewhere.
> > > > > > I control both sides of the interface, the source
as well as the
> > > > > > processing so I know the format will always be the
same.
> > > > > > (incidentally, the date comes from a .net date
originally, and I
> use
> > > > > > a .tostring("s") to get the iso format,
which is passed to json
> as a
> > > > > > string - there may be a better way for that)
> > >
> > > > > > Hope this makes sense,
> > >
> > > > > > Gareth
> > >
> >
>
> >
>
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