How to check if an array is empty in Perl (newbie question)

resetreset · 11-28-2008, 02:03 AM

Hello,
To do this, can I do this?:

if (@ary = ""),

or is something more needed?

ghostdog74 · 11-28-2008, 02:13 AM

you can check for the length of the array.

resetreset · 11-28-2008, 02:24 AM

how do I do that?

ghostdog74 · 11-28-2008, 02:37 AM

Code:

perldoc -f length

read carefully what it says.

burschik · 11-28-2008, 03:26 AM

Quote:

Originally Posted by resetreset

Hello,
To do this, can I do this?:

if (@ary = ""),

or is something more needed?

Not quite. In scalar context, an array evaluates to its length. Therefore, you could say

Code:

if (@ary == 0)

You could also use this

Code:

if (!@ary)

since 0 is considered false. Or this

Code:

if ($#ary < 0)

or even

Code:

if (scalar(@ary) == 0)