http://www.perlmonks.org?node_id=1043463


in reply to foreach argument modification inside loop, followed by return from loop

I first saw this issue severl years ago on the newsgroup perl.misc. Its use greatly simplified the solution to a posted problem. The consensus then was the same as today. It may work, but don't do it!
Bill
  • Comment on Re: foreach argument modification inside loop, followed by return from loop

Replies are listed 'Best First'.
Re^2: foreach argument modification inside loop, followed by return from loop
by vsespb (Chaplain) on Jul 10, 2013 at 13:33 UTC
    Are you sure it was about returning from loop immediately after modification of array? Can you find the link? Very interesting!
[reply]
      Sorry, It was much too long ago for my memory. I have not had access to a newsgroup server for some time. I do not even rember my old username. It was written by a very active user named PerlGurl (not sure of spelling). I reasonably certain that the application was randomizing an array. Notes that I had did not survive a hard drive failure.
      Bill
[reply]
        I found something.

        https://groups.google.com/forum/#!searchin/comp.lang.perl.misc/randomizing$20/comp.lang.perl.misc/D8Znz7CbCyg/ZXcyK3OTUEIJ

        PerlGuru + something about randomizing array + foreach+splice+last

        'If any part of LIST is an array, "foreach" will get very confused > if you add or remove elements within the loop body, for example with > "splice". So don't do that.' > > Your testing seems to prove that this is a special case, certainly a > very useful one. > Please explain what makes it special. The 'last' makes it special. By exiting the loop there is no opportunity for confusion.
        But I did not find see "Anyway, don't do it, even with "last"" advices :(
[reply]

In Section Seekers of Perl Wisdom