my @arr = map uc, split(/:/, $info);
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BTW,

for(my $i=0; $i<$iLength; $i++) {
  $arr[$i] = uc($arr[$i]);
}
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for (@arr) {
  $_ = uc;
}
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or even

$_ = uc for @arr
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for (@arr) {
  $_ = uc;
}
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That may be the "Perl way", but according to the Damian Conway-authored Perl Best Practices, a better way would be:

for my $index (@arr) {
  $index = uc $index;
}
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my @arr = map { uc( $_ ) } split(/:/, $info );

map?

my $info = "one:two:three:four";
my @arr = split /:/, uc $info;
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I like that even more. Run uc on the text before splitting it.

my @stuff=qw(foo bar baz);
print join "\n",@stuff,"\n";
print "test!\n";
------------
foo
bar
baz

test!
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print join "\n",@stuff,"\n";

Your code results in a double newline at the end of the string being printed, which might not fit the requirement. Why not use parentheses so that join only operates on @stuff? Or why not make the last item being joined an empty string? Another way would be to modify the default list separator (see $LIST_SEPARATOR or $" in perlvar).

$ perl -e '
> my @stuff = qw{ foo bar baz };
> 
> print join qq{\n}, @stuff, qq{\n};
> print qq{Tail of test 1\n};
> 
> print join( qq{\n}, @stuff ), qq{\n};
> print qq{Tail of test 2\n};
> 
> print join qq{\n}, @stuff, q{};
> print qq{Tail of test 3\n};
> 
> print do{ local $" = qq{\n}; qq{@stuff\n} };
> print qq{Tail of test 4\n};'
foo
bar
baz

Tail of test 1
foo
bar
baz
Tail of test 2
foo
bar
baz
Tail of test 3
foo
bar
baz
Tail of test 4

$
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I hope this is of interest.

Cheers,

JohnGG

Exactly. There are many ways to fix that, my point wasn't to fix it, my point was to show that it takes a bit of practice to train your intuition to operate on lists that way.

#!/usr/bin/perl -w
use strict;

my $info = "one:two:three:four";
$info = uc($info);
my @arr = split(/:/, $info);

print "@arr\n";
__END__
Prints:
ONE TWO THREE FOUR
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my $info = "one:two:three:four";
my @arr = split(/:/, uc($info) );
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It's natural that you want to use uc like that.

First method - Call some methods on native types

You can use autobox for this in the following manner:

  2 package MyArray;
  3 use base qw(autobox);
  4 sub uc { return map { uc } @{$_[0]};   };
  5
  6
  7 package MyString;
  8 use base qw(autobox);
  9
 10 sub split { [ split $_[1], $_[0] ] ; };
 11
 12
 13 package main;
 14
 15
 16 use autobox ARRAY => 'MyArray';
 17 use autobox STRING => 'MyString';
 18 use feature 'say';
 19
 20 say "one:two:three:four"->split(':')->uc();
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or shorter:

  1
  2 use feature 'say';
  3 use autobox ;
  4
  5 sub ARRAY::uc { return map { uc } @{$_[0]};   };
  6 sub SCALAR::split { [ split $_[1], $_[0] ] ; };
  7
  8
  9 say "one:two:three:four"->split(':')->uc();
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Second method - Overriding the CORE method uc

This is simple , you just make up your own new method and you replace the one from CORE with your own in the BEGIN block

  1
  2
  3 use feature 'say';
  4
  5 sub new_uc {
  6     @_ > 1
  7     ? map { uc } @_
  8     : uc $_[0] ;
  9 }
 10
 11 BEGIN {
 12     *CORE::GLOBAL::uc = *new_uc;
 13 }
 14
 15 say uc split(':',"one:two:three:four");
 16
 17 my $w = uc "a";
 18 say $w;
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By writing new_uc like that you assure that it will work as the old uc for scalars and in the new way for arrays