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Groups > comp.lang.javascript > #10615
| From | Denis McMahon <denismfmcmahon@gmail.com> |
|---|---|
| Subject | Re: Comparing arraies |
| Newsgroups | comp.lang.javascript |
| References | <8dc6b834-cd20-47a5-a085-f4d5e4402c38@c13g2000yqk.googlegroups.com> <4f218d62$0$6578$9b4e6d93@newsspool3.arcor-online.net> |
| Date | 2012-01-26 23:08 +0000 |
| Message-ID | <4f21dd07$0$28275$862e30e2@ngroups.net> (permalink) |
On Thu, 26 Jan 2012 18:29:06 +0100, Martin Honnen wrote:
> Archos wrote:
>> How to know if 2 arraies are equal? I was expecting that it could be
>> checked so:
>>
>>>>> var array1 = [1,2,3,4], array2 = [1,2,3,4]; if (array1 === array2) {
>>>>> console.log("array1 and array2 are equal"); }
>>
>> Since the comparing of strings or integers works:
>>
>> var a = "2", b = "2";
>> if (a === b) { console.log("a == b"); }
>
> No, for objects (and arrays are objects) the identity is checked, no
> comparison of properties or elements is done. So with e.g.
>
> var a1, a2;
>
> a1 = a2 = [1, 2, 3, 4];
>
> a1 == a2
>
> you get true as the two variables hold references to the same array
> object.
>
> If you want to compare the elements you will need to define and
> implement your own comparison function I think
It might be easier to compare two vars universally, assuming the JSON
object is available, by:
function are_identical(var1, var2) {
return JSON.stringify(var1) === JSON.stringify(var2);
}
I think this would work for anything that can be stringified by the
JSON.stringify() method.
Rgds
Denis McMahon
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Comparing arraies Archos <raul.san@sent.com> - 2012-01-26 07:23 -0800
Re: Comparing arraies Martin Honnen <mahotrash@yahoo.de> - 2012-01-26 18:29 +0100
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-01-26 19:50 +0100
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-01-26 19:54 +0100
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-01-27 16:49 +0000
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-01-27 18:41 +0100
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-01-28 11:28 +0000
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-01-28 21:17 +0100
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-01-29 14:55 +0000
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-01-29 17:13 +0100
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-01-30 15:27 +0000
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-01-30 19:03 +0100
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-01-31 15:07 +0000
Re: Comparing arraies Dr J R Stockton <reply1205@merlyn.demon.co.uk> - 2012-01-31 18:51 +0000
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-01-30 12:01 -0800
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-01-31 11:06 +0000
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-01-31 06:08 -0800
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-01-31 16:08 +0000
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-01-31 18:32 -0800
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-02-01 17:02 +0000
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-02-01 10:07 -0800
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-02-02 15:10 +0000
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-02-02 11:16 -0800
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-02-07 15:14 +0000
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-02-01 21:45 +0100
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-02-01 13:07 -0800
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-02-01 23:44 +0100
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-02-01 18:22 -0800
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-02-02 23:09 +0100
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-02-03 01:47 +0100
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-02-04 10:34 +0000
Re: Comparing arraies Dr J R Stockton <reply1205@merlyn.demon.co.uk> - 2012-02-05 16:47 +0000
Re: Comparing arraies John G Harris <john@nospam.demon.co.uk> - 2012-02-06 15:21 +0000
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-02-04 23:37 -0800
Re: Comparing arraies Denis McMahon <denismfmcmahon@gmail.com> - 2012-01-26 23:08 +0000
Re: Comparing arraies Denis McMahon <denismfmcmahon@gmail.com> - 2012-01-27 01:42 +0000
Re: Comparing arraies Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-01-27 11:41 +0100
Re: Comparing arraies Gene Wirchenko <genew@ocis.net> - 2012-01-26 16:24 -0800
Re: Comparing arraies "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-01-27 08:50 +0000
Re: Comparing arraies Dr J R Stockton <reply1204@merlyn.demon.co.uk> - 2012-01-27 21:07 +0000
Re: Comparing arraies "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-01-28 13:45 +0000
Re: Comparing arraies "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-01-26 16:21 -0800
Re: Comparing arraies Martin Honnen <mahotrash@yahoo.de> - 2012-01-27 16:00 +0100
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