Re^3: Remove redundency from an array

jdporter: Of course, that clobbers $_. Perhaps you want to insert local *_; ...

Would this (*_) be relevant here?

$_ *might* be localized, but *_ imho not.

consider:

sub uinq {
   # local *_;  # <== will fail, $_ will work
   @_ = do { @$_{@_}=(); keys %$_ }; @_
} 

my @array = (1,1,3,3,2,3,5,7,5,2);

print "@{[ uinq @array ]}\n";
[download]

Regards & thanks
mwa

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Re^4: Remove redundency from an array by ikegami (Patriarch) on Sep 24, 2007 at 19:34 UTC
First, `local *_` does work if you put it in the `do` block like jdporter said. Secondly, `local $_` won't work. It'll compile, but that doesn't count for anything if it doesn't do what needs to be done. We want to protect the parent's `%_`.	[reply] [d/l] [select]
Re^5: Remove redundency from an array by mwah (Hermit) on Sep 24, 2007 at 19:47 UTC
ikegami: - local _ does work if you put it in the do block like jdporter said* - ... want to protect the parent's %_ * Did you test this with the sub{}-example I provided in order to show context dependency? * where would preservation of %_ (jdporter mentioned $_) usually be of some importance? Regards & thanks mwa	[reply]
Re^6: Remove redundency from an array by ikegami (Patriarch) on Sep 24, 2007 at 19:52 UTC
Did you test this with the sub{}-example I provided in order to show context dependency? Nope. I know it does exactly what you said it does. What it doesn't do is show what jdporter's solution has a problem. That would surely involve using jdporter's solution. where would preservation of %_ (jdporter mentioned $_) usually be of some importance? jdporter mentioned `*_`, not `$_`. And localizing `%_` would be "of some importance" when `%_` is changed, like in the parent of the post to which jdporter replied. The same applies to all global variables.	[reply] [d/l] [select]
Re^7: Remove redundency from an array by mwah (Hermit) on Sep 24, 2007 at 20:06 UTC
Re^8: Remove redundency from an array by ikegami (Patriarch) on Sep 24, 2007 at 20:24 UTC
Some notes below your chosen depth have not been shown here
Re^4: Remove redundency from an array by jdporter (Paladin) on Sep 24, 2007 at 20:05 UTC
Good point. It's up to you (the programmer) to protect/preserve the contents of `@_` if necessary. It wasn't necessary in the code you gave. ikegami may be too modest to point out his previous discursion on the subject.	[reply] [d/l]