Re: Question about concatenation

[eyepopslikeamosquito]

The difference is because the range operator behaves differently in list context to scalar context. BTW, so do arrays. As indicated in the test program below, the array returns the number of elements in scalar context, while the flip flop operator returns false (represented as undef), which prints as an empty string. Running:

use strict;
use warnings;

print "Counting up: " . (1..6) . "\n";       # scalar context (undef)
print "Counting up: " , (1..6) , "\n";       # list context
print "Counting up: @{[1..6]}\n";            # list context, space bet
+ween each element

my @one_to_six = 1..6;
print "Counting up: " . @one_to_six . "\n";  # scalar context (no. of 
+elts)
print "Counting up: " , @one_to_six , "\n";  # list context

produces:

Use of uninitialized value $. in range (or flip) at cnt.pl line 4.
Counting up:
Counting up: 123456
Counting up: 1 2 3 4 5 6
Counting up: 6
Counting up: 123456