Re: Empty array

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From	Dr J R Stockton <reply1209@merlyn.demon.co.uk>
Newsgroups	comp.lang.javascript
Subject	Re: Empty array
Date	Thu, 1 Mar 2012 21:20:25 +0000
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In comp.lang.javascript message <opuqk7hsm5bkmp0b14shc14vmv3di8honh@4ax.
com>, Tue, 28 Feb 2012 17:20:30, Gene Wirchenko <genew@ocis.net> posted:

>
>     You could join the array and check against an empty string, but
>that could be expensive with a large array.

And expensive code is particularly bad value if it does not work.

In current Firefox :
        A = []
        A[4.67] = 66
        A.length          // 0
        A.join()          // blank
        A.join().length   // 0
        A[467/100]        // 66

When testing for emptiness, the first thing to do is to define the sort
of item that one wants to test for the absence of.

My favourite tea-cup might be considered to be empty - it is upside-
down.  But it is almost full of air.  It also contains about half a
milk-bottle, itself empty - of milk but not of air.  The air itself is
almost empty; only about 0.1% of it is atoms.  The atoms are even
emptier.

-- 
 (c) John Stockton, nr London UK.  ?@merlyn.demon.co.uk  DOS 3.3 6.20 ; WinXP.
   Web  <http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links.
   PAS EXE TXT ZIP via  <http://www.merlyn.demon.co.uk/programs/00index.htm>
   My DOS  <http://www.merlyn.demon.co.uk/batfiles.htm> - also batprogs.htm.

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Empty array Archos <raul.san@sent.com> - 2012-02-25 10:21 -0800
  Re: Empty array Gregor Kofler <usenet@gregorkofler.com> - 2012-02-25 23:02 +0100
  Re: Empty array Dr J R Stockton <reply1208@merlyn.demon.co.uk> - 2012-02-26 20:50 +0000
    Re: Empty array "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-02-27 14:46 +0000
      Re: Empty array Dr J R Stockton <reply1209@merlyn.demon.co.uk> - 2012-02-28 23:42 +0000
  Re: Empty array Asen Bozhilov <asen.bozhilov@gmail.com> - 2012-02-27 07:30 -0800
    Re: Empty array Dr J R Stockton <reply1209@merlyn.demon.co.uk> - 2012-02-28 22:00 +0000
      Re: Empty array Gene Wirchenko <genew@ocis.net> - 2012-02-28 17:20 -0800
        Re: Empty array Asen Bozhilov <asen.bozhilov@gmail.com> - 2012-02-29 01:23 -0800
          Re: Empty array Gene Wirchenko <genew@ocis.net> - 2012-02-29 14:12 -0800
        Re: Empty array Dr J R Stockton <reply1209@merlyn.demon.co.uk> - 2012-03-01 21:20 +0000

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