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Groups > comp.lang.javascript > #26937
| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: What's wrong with this code? |
| Date | 2015-02-26 14:25 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <8761aopx65.fsf@bsb.me.uk> (permalink) |
| References | <b2751271-cbda-4bcd-9217-a37eb3fa58b0@googlegroups.com> |
denissavenok@gmail.com writes:
> The function doesn't work as expected. Why?
>
> var isUndefinedOrNull = function(obj) {
> return /^(?:undefined|null)$/.test(typeof obj);
> };
If the type of obj is Null, typeof is defined to yield 'object'.
You might (in some very odd implementation) get 'null' from typeof, but
that's only because the result is up to the implementation in some very
specific cases.
--
Ben.
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What's wrong with this code? denissavenok@gmail.com - 2015-02-26 01:18 -0800
Re: What's wrong with this code? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-26 12:17 +0100
Re: What's wrong with this code? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-02-26 14:25 +0000
Re: What's wrong with this code? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-26 16:04 +0100
Re: What's wrong with this code? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-02-26 15:37 +0000
Re: What's wrong with this code? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-26 17:09 +0100
Re: What's wrong with this code? Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2015-02-26 14:09 -0300
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