Tricks, tips, one-liners, and friends

* Hash for testing for existence of keys:

my @words = qw(john mary ted larry wendel);
my %dict; 
@dict{@words} = undef;

print "larry exists \n" if exists $dict{'larry'};
print "bill exists \n" if exists $dict{'bill'};
print "bill doesn't exist \n" unless exists $dict{'bill'};
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