The Perl Conference Salt Lake City 2018 Banner

Perl Style: Learn to Switch with for

  • Though Perl has no built-in switch statement, this is not a hardship but an opportunity.
  • It’s easy to build one. The word `for’ is sometimes pronounced `switch’.

       SWITCH: for ($where) {
                   /In Card Names/     && do { push @flags, '-e'; last; };
                   /Anywhere/          && do { push @flags, '-h'; last; };
                   /In Rulings/        && do {                    last; };
                   die "unknown value for form variable where: `$where'";
               }
    
  • Like a series of elsifs, a switch should always have a default case, even if the default case `can’t happen’.


Forward to Switch by Using do{} Creatively
Back to Closures
Up to index

Copyright © 1998, Tom Christiansen All rights reserved.

Tags

Feedback

Something wrong with this article? Help us out by opening an issue or pull request on GitHub