What you are trying to write is like a message despatcher, and Yes there are many techniques -

Method 1

if (condition1) {
  code_for_condition1($data)
} elsif (condition2) {
  code_for_condition2($data)
} else {
  default_condition($data)
}
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The first method is the obvious method, it is not necessarily a bad method at all.

Method 2

%despatcher = (
  ident_1 => \*code_for_condition1,
  ident_2 => \*code_for_condition2,
  ...
};

&$despatcher{$identifier}($data);

sub code_for_condition1 {
  ...
}

sub code_for_condition2 {
  ...
}
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The second method using a hash table requires more Perl knowledge. It has a slightly more complicated syntax structure, and a hash table overhead. It is nevertheless a good method.

<TO BE CONTINUED...>Too late for bed time tonight, I will add some more tomorrow...