在Perl中使用变量引用哈希键

Question

I am trying to create a Perl script that allows me access a hash key/value by using a variable.

The code below is a very high level example of script does. Is there any way to reference the key of the hash with a variable? It looks like the $hash_exmp{$temp_var} is not being accepted.

my %hash_exmp = (
    $key_1 => "file1",
    $key_2 => "file2",
    $key_3 => "file3",
);

for($i = 1; $i <= 3; $i++){
    for($j = 1; $j <= 3; $j++){     
        print $j;            
        $temp_var = "key_${i}";
        print $hash_exmp{$temp_var};
    };
};

Answer 1

If I understand correctly what you are trying to do, you want something like this:

my %hash_exmp = (
    'key_1' => "file1",
    'key_2' => "file2",
    'key_3' => "file3",
);
for(my $i = 1; $i <= 3; $i++){
    print $hash_exmp{'key_'.$i} . "\n";
}

Answer 2

The issue was making my keys as variables when I changed them to string names it works. In other words I changed from $key1 => "file1" to key1 => "file1"