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How do I print an array with commas separating each element?

( #30279=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Aug 30, 2000 at 14:55 UTC
Q&A  > arrays


Answer: How do I print an array with commas separating each element?
contributed by Jouke

There is:

print join( ',', @array );
Answer: How do I print an array with commas separating each element?
contributed by ar0n

$, = ','; print @array;

$, is the output field separator: print will insert whatever string has been assigned to $, between all of its arguments.

Note that if you use this technique, you should make your assignment to $, temporary by doing

local $, = ',';

Answer: How do I print an array with commas separating each element?
contributed by OfficeLinebacker

Observe the difference in effects between $" and $,

$\ = "\n"; my @a = qw( One Two Three ); { local $, = ','; print @a; print "@a"; } { local $" = ','; print @a; print "@a"; }
Output:
One,Two,Three One Two Three OneTwoThree One,Two,Three

Answer: How do I print an array with commas separating each element?
contributed by Roy Johnson

$" can also be used for this:

local $" = ','; print "@arr\n";
Answer: How do I print an array with commas separating each element?
contributed by nite_man

And another way:

map { print $_ . ($_ == $array[$#array] ? '' : ', ' ) } @array;
Answer: How do I print an array with commas separating each element?
contributed by Coruscate

For completeness, here's a verbose solution:

my $x; my @a = qw(one two three); print "$a[$_-1], " while $x++ < $#a; print "$a[$#a]";
Answer: How do I print an array with commas separating each element?
contributed by turnstep

Here's another way:

my $x = 0; printf "$array[$x-1]%s", $x <= $#array ? "," : "\n" while $array[$x++];

It puts a newline instead of a comma after the last element.

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