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Groups > comp.lang.javascript > #19839

Re: jslint and typeof

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"Jukka K. Korpela" <jkorpela@cs.tut.fi> writes:

> 2013-05-20 12:59, Andrew Poulos wrote:
>
>> if (typeof options.actor !== "undefined") {
> [...]
>> and jslint complains of the first line that
>>
>> "Unexpected 'typeof'. Use '===' to compare directly with undefined."
>>
>> but the complaint makes little sense to me.

OK.

> Since the only value of type "undefined" is the one denoted by the
> variable undefined,

Property, not variable, and that's not necessarily true, either.

> the test
>
> typeof options.actor !== "undefined"
>
> is unnecessary complicated, since you can use
>
> options.action !== undefined

This, however, is unnecessarily brittle since the undefined property of
the global object is writable in ES < 5. It is also overly verbose.

options.action !== void 0;

(JSLint won't like that either, of course.)

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Thread

jslint and typeof Andrew Poulos <ap_prog@hotmail.com> - 2013-05-20 19:59 +1000
  Re: jslint and typeof "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-05-20 13:40 +0300
    Re: jslint and typeof Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-05-20 13:34 +0200
      Re: jslint and typeof Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-05-20 14:23 +0200
        Re: jslint and typeof Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-05-26 17:40 +0200
  Re: jslint and typeof Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-05-20 13:48 +0200
  Re: jslint and typeof Stefan Weiss <krewecherl@gmail.com> - 2013-05-20 14:44 +0200
    Re: jslint and typeof Andrew Poulos <ap_prog@hotmail.com> - 2013-05-20 23:17 +1000

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