Question

Is there any way to use a constant as a hash key?

For example:

use constant X => 1;  my %x = (X => 'X'); 

The above code will create a hash with ‘X’ as key and not 1 as key. Whereas, I want to use the value of constant X as key.

Answer 1

use constant actually makes constant subroutines.

To do what you want, you need to explicitly call the sub:

use constant X => 1;  my %x = ( &X => 'X'); 

or

use constant X => 1;  my %x = ( X() => 'X');