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  1. or download this
    my %hash;
@hash{val1, val2, val3} = undef;

if (exists $hash{$test}) {
}
  2. or download this
    my %hash = (val1 => \&task1, val2 => \&task2, val3 => \&task3);

if (exists $hash{$test}) {
    $hash{$test}->();
}