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Postings from April 2002
At 08:24 PM 4/25/02 -0400, Jeff 'japhy' Pinyan wrote:
>On Apr 25, Bryan R Harris said:
>
> >I'd like to remove all elements in an array that meet a certain criteria
> >without changing their order. I'm sure this gets done all the time, but
> >I'm not sure how to do it...
>
>You want splice() instead.
>
> perldoc -f splice
The poster appeared to want to remove possible discontiguous element sequences:
>>My guess (this is just an example):
>>
>>@myarray = (1,2,3,4,5,6,7,8,9,10);
>>foreach (@myarray) { if ($_ == 3 || $_ == 5) { undef($_); } }
>>
>>But I don't think it's working right...
Right, setting an element to undef does not remove it.
Use splice() if you want to remove a known number of elements that are all
adjacent and start from a known offset. Otherwise, use grep:
@myarray = grep { $_ != 3 && $_ != 5 } @myarray
If you want to remove elements based upon some criteria applied to their
*index*, use an array slice.
--
Peter Scott
Pacific Systems Design Technologies
http://www.perldebugged.com
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