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Re^2: Yet another config file editing programme : Tell me how to make it better !

by eyepopslikeamosquito (Bishop)
on Sep 03, 2021 at 09:39 UTC ( #11136404=note: print w/replies, xml ) Need Help??


in reply to Re: Yet another config file editing programme : Tell me how to make it better !
in thread Yet another config file editing programme : Tell me how to make it better !

I started using Switch, then I read in CPAN "do not use if you can use given/when". Then when I used given/when, I ended up with warnings plus advice not to use given/when. Hmmmmmm. As an occasional perl user, that is a little frustrating rewriting the same section of code 3x to do exactly the same thing. I just need something that has case type functionality.

I can certainly understand your frustration. This was a very sad affair for the Perl community. Though adding smart match into Perl was premature, and had to be backed out, at least P5P learned a valuable lesson.

Not wanting to gloat (no, really) but this didn't affect me, at all, because I've never been a fan of switch. Stronger, I've almost never used Switch in over 20 years of coding in C++ and Perl and always queried its use during code reviews. Though it's a bit extreme to call Switch a code smell, cleaner alternatives, such as lookup-tables (hashes in Perl) and polymorphism (in OO languages, such as C++ and Java) should be preferred.

From Perl Best Practices I suggest you take a look at the Control Structures chapter, especially:

  • 6.16 Value Switches - Use table look-up in preference to cascaded equality tests (item 78)
  • 6.17 Tabular Ternaries - When producing a value, use tabular ternaries (item 79)

Though my advice in Perl is usually "just use a hash", as a last resort you could replace your switch with an if-elsif-elsif-else construct. See also:

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