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Dave Crane

2007-Jan-19 14:09 UTC

Re: Prototype.js: Is there an "in_array"-like function?

On Friday 19 January 2007 16:46, Kjell Bublitz wrote:> Hi
>
> i was wondering if there is a quick way to search for a item within an
> array. Here is my approach for this functionality. It''s an
prototype
> for an Array method called "has":
>
> Array.prototype.has = function(needle) {
> 	for (var i=0;i<this.length;i++) {
> 		if(this[i] == needle){ return true; }
> 	}
> 	return false;
> }
>
> var someArray = [''jim'', ''marge'',
''timmeh'', ''bob''];
>
> if( someArray.has(''bob'') )
> {
>     alert(''found bob'')
> }
>
> Isn''t there something like "has()" in prototype already?
I have seen
> the find / findAll, but the example in the docs are kinda complex for
> "just that".. could someone break it down for me please? i would
much
> appreciate.
>
> TIA, Kjell
>include() does this

Cheers,

Dave
-- 
----------------------
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Kjell Bublitz

2007-Jan-19 16:46 UTC

head link

Prototype.js: Is there an "in_array"-like function?

Hi

i was wondering if there is a quick way to search for a item within an
array. Here is my approach for this functionality. It''s an prototype
for an Array method called "has":

Array.prototype.has = function(needle) {
	for (var i=0;i<this.length;i++) {
		if(this[i] == needle){ return true; }
	}
	return false;
}

var someArray = [''jim'', ''marge'',
''timmeh'', ''bob''];

if( someArray.has(''bob'') )
{
    alert(''found bob'')
}

Isn''t there something like "has()" in prototype already? I
have seen
the find / findAll, but the example in the docs are kinda complex for
"just that".. could someone break it down for me please? i would much
appreciate.

TIA, Kjell

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Thomas Fuchs

2007-Jan-19 16:57 UTC

head link

Re: Prototype.js: Is there an "in_array"-like function?

[''a'',''b'',''c''].include(''b'')
--> true

See http://prototypejs.org/api/enumerable/include

Best,
Thomas


Am 19.01.2007 um 17:46 schrieb Kjell Bublitz:
>
> Hi
>
> i was wondering if there is a quick way to search for a item within an
> array. Here is my approach for this functionality. It''s an
prototype
> for an Array method called "has":
>
> Array.prototype.has = function(needle) {
> 	for (var i=0;i<this.length;i++) {
> 		if(this[i] == needle){ return true; }
> 	}
> 	return false;
> }
>
> var someArray = [''jim'', ''marge'',
''timmeh'', ''bob''];
>
> if( someArray.has(''bob'') )
> {
>    alert(''found bob'')
> }
>
> Isn''t there something like "has()" in prototype already?
I have seen
> the find / findAll, but the example in the docs are kinda complex for
> "just that".. could someone break it down for me please? i would
much
> appreciate.
>
> TIA, Kjell
>
> >

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Nicholas Schlueter

2007-Jan-19 16:59 UTC

head link

Re: Prototype.js: Is there an "in_array"-like function?

http://prototypejs.org/api/enumerable/any

Man that feels good pointing to the "official docs"

but seriously this *should* work.

var someArray = [''jim'', ''marge'',
''timmeh'', ''bob''];

if( someArray.any(function(n){return n == ''bob'';}) ) {
   alert(''found bob'')
}

syntax is a bit weird if you aren''t used to it, but once you are it is
very powerful.

Nicholas

On 1/19/07, Kjell Bublitz
<m3nt0r.de-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
> Hi
>
> i was wondering if there is a quick way to search for a item within an
> array. Here is my approach for this functionality. It''s an
prototype
> for an Array method called "has":
>
> Array.prototype.has = function(needle) {
>         for (var i=0;i<this.length;i++) {
>                 if(this[i] == needle){ return true; }
>         }
>         return false;
> }
>
> var someArray = [''jim'', ''marge'',
''timmeh'', ''bob''];
>
> if( someArray.has(''bob'') )
> {
>     alert(''found bob'')
> }
>
> Isn''t there something like "has()" in prototype already?
I have seen
> the find / findAll, but the example in the docs are kinda complex for
> "just that".. could someone break it down for me please? i would
much
> appreciate.
>
> TIA, Kjell
>
> >
>

-- 
DCRails.com || Making the Metrorail fun!
http://www.captureimportant.info || Sidewalk || Bring People to You

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Nicholas Schlueter

2007-Jan-19 17:01 UTC

head link

Re: Prototype.js: Is there an "in_array"-like function?

ok yours is better, you win :)

On 1/19/07, Thomas Fuchs <t.fuchs-moWQItti3gBl57MIdRCFDg@public.gmane.org>
wrote:>
>
[''a'',''b'',''c''].include(''b'')
--> true
>
> See http://prototypejs.org/api/enumerable/include
>
> Best,
> Thomas
>
>
> Am 19.01.2007 um 17:46 schrieb Kjell Bublitz:
>
> >
> > Hi
> >
> > i was wondering if there is a quick way to search for a item within an
> > array. Here is my approach for this functionality. It''s an
prototype
> > for an Array method called "has":
> >
> > Array.prototype.has = function(needle) {
> >       for (var i=0;i<this.length;i++) {
> >               if(this[i] == needle){ return true; }
> >       }
> >       return false;
> > }
> >
> > var someArray = [''jim'', ''marge'',
''timmeh'', ''bob''];
> >
> > if( someArray.has(''bob'') )
> > {
> >    alert(''found bob'')
> > }
> >
> > Isn''t there something like "has()" in prototype
already? I have seen
> > the find / findAll, but the example in the docs are kinda complex for
> > "just that".. could someone break it down for me please? i
would much
> > appreciate.
> >
> > TIA, Kjell
> >
> > >
>
>
> >
>

-- 
DCRails.com || Making the Metrorail fun!
http://www.captureimportant.info || Sidewalk || Bring People to You

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Kjell Bublitz

2007-Jan-19 17:05 UTC

head link

Re: Prototype.js: Is there an "in_array"-like function?

Nah.. both won.. include() is not strict.. with your example i could
force that by using ==so... i asked for one function and got myself two.. Thank
you :)


PS: include should get a boolean modifier to enable strict comparsion.

On 1/19/07, Nicholas Schlueter
<schlueter-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
> ok yours is better, you win :)
>
> On 1/19/07, Thomas Fuchs
<t.fuchs-moWQItti3gBl57MIdRCFDg@public.gmane.org> wrote:
> >
> >
[''a'',''b'',''c''].include(''b'')
--> true
> >
> > See http://prototypejs.org/api/enumerable/include
> >
> > Best,
> > Thomas
> >
> >
> > Am 19.01.2007 um 17:46 schrieb Kjell Bublitz:
> >
> > >
> > > Hi
> > >
> > > i was wondering if there is a quick way to search for a item
within an
> > > array. Here is my approach for this functionality. It''s
an prototype
> > > for an Array method called "has":
> > >
> > > Array.prototype.has = function(needle) {
> > >       for (var i=0;i<this.length;i++) {
> > >               if(this[i] == needle){ return true; }
> > >       }
> > >       return false;
> > > }
> > >
> > > var someArray = [''jim'',
''marge'', ''timmeh'', ''bob''];
> > >
> > > if( someArray.has(''bob'') )
> > > {
> > >    alert(''found bob'')
> > > }
> > >
> > > Isn''t there something like "has()" in
prototype already? I have seen
> > > the find / findAll, but the example in the docs are kinda complex
for
> > > "just that".. could someone break it down for me
please? i would much
> > > appreciate.
> > >
> > > TIA, Kjell
> > >
> > > >
> >
> >
> > >
> >
>
>
> --
> DCRails.com || Making the Metrorail fun!
> http://www.captureimportant.info || Sidewalk || Bring People to You
>
> >
>

-- 
Kjell
-- www.m3nt0r.de

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Christophe Porteneuve

2007-Jan-19 17:51 UTC

head link

Re: Prototype.js: Is there an "in_array"-like function?

Hey there,

Kjell Bublitz a crit :> Nah.. both won.. include() is not strict.. with your example i could
That''s right, and AFAIK, in_array isn''t either (at least by
default).

However, aside from issues with arrays containing such stuff as null, 
false and undefined, it''s not much of an issue, is it?

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Thomas Fuchs

2007-Jan-19 21:06 UTC

head link

Re: Prototype.js: Is there an "in_array"-like function?

Well, for example there''s

0 == ''''  -> true

So maybe not a bad idea at all, but i guess a new method is nicer for  
this.

Best,
Thomas

Am 19.01.2007 um 18:51 schrieb Christophe Porteneuve:
>
> Hey there,
>
> Kjell Bublitz a écrit :
>> Nah.. both won.. include() is not strict.. with your example i could
>
> That''s right, and AFAIK, in_array isn''t either (at least
by default).
>
> However, aside from issues with arrays containing such stuff as  
> null, false and undefined, it''s not much of an issue, is it?
>
> -- 
> Christophe Porteneuve aka TDD
> tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org
>
> >

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