Simple question

How to determine if a value is already in an array?

Of course I can do it with a loop and compare, but I suspect there must be easier ways. (forgive me, I am a perl rookie).

Thanks in advance.

See the grep function:
http://www.perldoc.com/f?grep

@matches = grep { /this_pattern_from/ } @values

Sample usage:

my @ary = qw(one two three);
my $val = 'test';

if (grep { /$val/ } @ary) {
print "it existsn";
}
else {
print "it does not existn";
}


<BLOCKQUOTE><font size="1" face="Verdana,Arial,Helvetica">quote:</font><HR>Originally posted by liupang:
How to determine if a value is already in an array?

Of course I can do it with a loop and compare, but I suspect there must be easier ways. (forgive me, I am a perl rookie).

Thanks in advance.[/quote]

I think simplest way is to use hashes :
@a = qw {one two three};
$var = 'test';

@seen{@a}=1;
print "$var already exists" if $seen{$var};


<BLOCKQUOTE><font size="1" face="Verdana,Arial,Helvetica">quote:</font><HR>Originally posted by liupang:
How to determine if a value is already in an array?

Of course I can do it with a loop and compare, but I suspect there must be easier ways. (forgive me, I am a perl rookie).

Thanks in advance.[/quote]



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Regards, Andrew
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