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Re: Given When Syntax

by ww (Archbishop)
on Mar 15, 2014 at 16:12 UTC ( #1078457=note: print w/replies, xml ) Need Help??


in reply to Given When Syntax

Read the friendly manual more thoroughly:

perlsyn: "The experimental "given" statement is *not automatically enabled*; see "Switch Statements" below for how to do so, and the attendant caveats."

Rough digest of the referenced matter: From 5.10.1 on one can say use feature "switch"; and from 5.14 onward, you can enable switch (given/when) by specifying the Perl version.

When done per the doc, execution (under 5.16/32bit Win7) is as follows:

C:\>perl 1078449.pl 2 is Two C:\>

using your code with addition of line 3, specifying a version = or > 5.14:

use strict; use warnings; use 5.016; sub test2 { my $var = 2; my $i; given ($var){ when(1) { $i = "One"; } when(2) { $i = "Two"; } when(3) { $i = "Three"; } default { $i = "Other"; } } print "$var is $i"; } test2();

Questions containing the words "doesn't work" (or their moral equivalent) will usually get a downvote from me unless accompanied by:
  1. code
  2. verbatim error and/or warning messages
  3. a coherent explanation of what "doesn't work actually means.

Replies are listed 'Best First'.
Re^2: Given When Syntax
by Deep_Plaid (Acolyte) on Mar 15, 2014 at 16:33 UTC

    Hi WW. I did read the manual but did not read it thoroughly enough - you are correct (serves me right - I'm constantly admonishing others for not reading my own documentation carefully enough). When I declare my PERL version, the script does execute, although with "experimental" warnings. This is a good enough reason to avoid it.

    That being said, do you have any advice on the best approach from a performance standpoint? Thanks for your input - it's greatly appreciated!"

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