Re: array with s///g command

Or, if you want to be brief...

# assuming @array1 contains the values to change.

my @array2 = @array1;
@array2 = map { s/\s//g; $_ } @array2;

print @array2;
[download]

Gary Blackburn
Trained Killer

Comment on Re: array with s///g command Download Code

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Re^2: array with s///g command by wind (Priest) on Jul 30, 2007 at 00:14 UTC
Slightly cleaner: `my @array2 = @array1; s/\s+//g for (@array2);` [download] Or in a single statement: `my @array2 = map {(my $x = $_) =~ s/\s+//g; $x} @array1;` [download] The main concern you must have when dealing with map and a regex is not destructing the original array unless you truly intend to. $_ is an alias to each element of the source array, so any modification of it modifies the original array. To avoid this we assign to a temporary lexical in the above map block. And then finally make sure to return the actual variable and not a count of the number of substitutions. Personally, I'd probably just stick with your original code, as I kind of doubt that you truly need a second array with these crunched values. Instead simply add the "crunching" as part of the loop for whatever other processing that you intend to be doing. Whatever that may be. - Miller	[reply] [d/l] [select]
Re^3: array with s///g command by convenientstore (Pilgrim) on Jul 30, 2007 at 00:36 UTC
thanks guys, it's working. I still dont' understand map too well(along with many other things).. can someone show me a URL that has map tutorial better than http://perldoc.perl.org/functions/map.html ?? Their explanation on how to mix it in with other does not make much sense to me.	[reply]
Re^4: array with s///g command by GrandFather (Saint) on Jul 30, 2007 at 01:32 UTC
You should take a bit of time to browse through the Tutorials section here. Of immediate interest you will find Map: The Basics there and the List Processing, Filtering, and Sorting sub-section in general is likely to be of value. But don't stop there - you will find lots of good stuff if you poke around the many corners and alcoves of the Tutorials section. DWIM is Perl's answer to Gödel	[reply]
Re^5: array with s///g command by convenientstore (Pilgrim) on Jul 30, 2007 at 06:50 UTC
Re^3: array with s///g command by Anno (Deacon) on Jul 30, 2007 at 09:48 UTC
You can simply join the statements `my @array2 = @array1; s/\s+//g for (@array2);` [download] into one: `tr/ //d for my @array2 = @array1;` [download] The tr/// here only treats blanks instead of general white space, but that's easily changed if necessary. Anno	[reply] [d/l] [select]
Re^2: array with s///g command by liverpole (Monsignor) on Jul 30, 2007 at 00:04 UTC
I like brief too ... why not simply:? `my @array2 = map { s/\s+//g; $_ } @array1;` [download] Update Whoops, now I see ... it's because you'd be changing the original array. Still, I like the brevity of something like: `my @array2 = map { (my $x = $_) =~ s/\s+//g; $x } @array1;` [download] s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/	[reply] [d/l] [select]
Re^3: array with s///g command by GrandFather (Saint) on Jul 30, 2007 at 00:28 UTC
Because that mangles @array1 - $_ is aliased to each element from @array1 and the substitution clobbers the original value DWIM is Perl's answer to Gödel	[reply]
Re^2: array with s///g command by grinder (Bishop) on Jul 30, 2007 at 10:00 UTC
`tr/ //d for @array2;` will probably be a tad faster, in that it transliterates, and avoid using a code block. • another intruder with the mooring in the heart of the Perl	[reply] [d/l]

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