Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic

Re: Perl Idioms Explained - keys %{{map{$_=>1}@list}}

by Juerd (Abbot)
on Aug 04, 2003 at 13:02 UTC ( #280660=note: print w/ replies, xml ) Need Help??

in reply to Perl Idioms Explained - keys %{{map{$_=>1}@list}}

In the same category, to see if $bar is in @foo:

my %foo = map { $_ => 1 } @foo; if ($foo{$bar}) { ... }
or faster and using less memory:
my %foo; undef @foo{@foo}; if (exists $foo{$bar}) { ... }

Of course, for a single test, grep is easier and often faster:

if (grep $_ eq $bar, @foo) { ... }

Juerd # { site => '', plp_site => '', do_not_use => 'spamtrap' }

Comment on Re: Perl Idioms Explained - keys %{{map{$_=>1}@list}}
Select or Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://280660]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others pondering the Monastery: (6)
As of 2015-11-28 23:54 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (746 votes), past polls