Là : http://www.perl.com/doc/FMTEYEWTK/style/slide37.html

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'.

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